Block IO Tracing
----------------
-Written by Jens Axboe <axboe@suse.de> (initial version and kernel support) and
-Alan D. Brunelle (threading and splitup into two seperate programs).
+Written by Jens Axboe <axboe@suse.de> (initial version and kernel support),
+Alan D. Brunelle (threading and splitup into two seperate programs),
+Nathan Scott <nathans@sgi.com> (bug fixes, process names, multiple devices)
Requirements
#define SECONDS(x) ((unsigned long long)(x) / 1000000000)
#define NANO_SECONDS(x) ((unsigned long long)(x) % 1000000000)
-static int backwards;
-static unsigned long long genesis_time, last_reported_time;
+#define MINORBITS 20
+#define MINORMASK ((1U << MINORBITS) - 1)
+#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS))
+#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK))
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
struct io_stats {
unsigned long qreads, qwrites, creads, cwrites, mreads, mwrites;
struct io_stats io_stats;
};
+struct per_dev_info {
+ dev_t id;
+ char *name;
+
+ int backwards;
+ unsigned long long events;
+ unsigned long long last_reported_time;
+ struct io_stats io_stats;
+
+ int ncpus;
+ struct per_cpu_info *cpus;
+};
+
struct per_process_info {
char name[16];
__u32 pid;
struct io_track {
struct rb_node rb_node;
+ dev_t device;
__u64 sector;
__u32 pid;
unsigned long long allocation_time;
unsigned long long completion_time;
};
-static int max_cpus;
-static struct per_cpu_info *per_cpu_info;
+static int ndevices;
+static struct per_dev_info *devices;
+static char *get_dev_name(struct per_dev_info *, char *, int);
-static unsigned long long events;
-
-static char *dev, *output_name;
static FILE *ofp;
+static char *output_name;
+
+static unsigned long long genesis_time;
static int per_process_stats;
static int track_ios;
#define RB_BATCH_DEFAULT (1024)
static int rb_batch = RB_BATCH_DEFAULT;
+static int pipeline;
+
#define is_done() (*(volatile int *)(&done))
static volatile int done;
struct rb_node *parent = NULL;
struct trace *__t;
+ if (genesis_time == 0 || t->bit->time < genesis_time)
+ genesis_time = t->bit->time;
+
while (*p) {
parent = *p;
__t = rb_entry(parent, struct trace, rb_node);
- if (t->bit->sequence < __t->bit->sequence)
+ if (t->bit->time < __t->bit->time)
+ p = &(*p)->rb_left;
+ else if (t->bit->time > __t->bit->time)
+ p = &(*p)->rb_right;
+ else if (t->bit->device < __t->bit->device)
+ p = &(*p)->rb_left;
+ else if (t->bit->device > __t->bit->device)
+ p = &(*p)->rb_right;
+ else if (t->bit->sequence < __t->bit->sequence)
p = &(*p)->rb_left;
else if (t->bit->sequence > __t->bit->sequence)
p = &(*p)->rb_right;
- else {
- fprintf(stderr, "sequence alias!\n");
+ else if (t->bit->device == __t->bit->device) {
+ fprintf(stderr,
+ "sequence alias (%d) on device %d,%d!\n",
+ t->bit->sequence,
+ MAJOR(t->bit->device), MINOR(t->bit->device));
return 1;
}
}
while (*p) {
parent = *p;
-
+
__iot = rb_entry(parent, struct io_track, rb_node);
- if (iot->sector < __iot->sector)
+ if (iot->device < __iot->device)
+ p = &(*p)->rb_left;
+ else if (iot->device > __iot->device)
+ p = &(*p)->rb_right;
+ else if (iot->sector < __iot->sector)
p = &(*p)->rb_left;
else if (iot->sector > __iot->sector)
p = &(*p)->rb_right;
else {
- fprintf(stderr, "sequence alias!\n");
+ fprintf(stderr,
+ "sector alias (%llu) on device %d,%d!\n",
+ iot->sector,
+ MAJOR(iot->device), MINOR(iot->device));
return 1;
}
}
return 0;
}
-static struct io_track *__find_track(__u64 sector)
+static struct io_track *__find_track(dev_t device, __u64 sector)
{
struct rb_node **p = &rb_track_root.rb_node;
struct rb_node *parent = NULL;
__iot = rb_entry(parent, struct io_track, rb_node);
- if (sector < __iot->sector)
+ if (device < __iot->device)
+ p = &(*p)->rb_left;
+ else if (device > __iot->device)
+ p = &(*p)->rb_right;
+ else if (sector < __iot->sector)
p = &(*p)->rb_left;
else if (sector > __iot->sector)
p = &(*p)->rb_right;
return NULL;
}
-static struct io_track *find_track(__u32 pid, __u64 sector)
+static struct io_track *find_track(__u32 pid, dev_t device, __u64 sector)
{
struct io_track *iot;
- iot = __find_track(sector);
+ iot = __find_track(device, sector);
if (!iot) {
iot = malloc(sizeof(*iot));
iot->pid = pid;
+ iot->device = device;
iot->sector = sector;
track_rb_insert(iot);
}
if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
return;
- iot = __find_track(t->sector - (t->bytes >> 10));
+ iot = __find_track(t->device, t->sector - (t->bytes >> 10));
if (!iot) {
fprintf(stderr, "Trying to merge on non-existing request\n");
return;
if (!track_ios)
return;
- iot = find_track(t->pid, t->sector);
+ iot = find_track(t->pid, t->device, t->sector);
iot->allocation_time = t->time;
}
if (!track_ios)
return -1;
- iot = find_track(t->pid, t->sector);
+ iot = find_track(t->pid, t->device, t->sector);
iot->queue_time = t->time;
elapsed = iot->queue_time - iot->allocation_time;
if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
return -1;
- iot = __find_track(t->sector);
+ iot = __find_track(t->device, t->sector);
if (!iot) {
fprintf(stderr, "Trying to issue on non-existing request\n");
return -1;
if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
return -1;
- iot = __find_track(t->sector);
+ iot = __find_track(t->device, t->sector);
if (!iot) {
fprintf(stderr, "Trying to dispatch on non-existing request\n");
return -1;
return &ppi->io_stats;
}
-static void resize_cpu_info(int cpuid)
+
+static void resize_cpu_info(struct per_dev_info *pdi, int cpu)
{
- int new_space, new_max = cpuid + 1;
+ struct per_cpu_info *cpus = pdi->cpus;
+ int ncpus = pdi->ncpus;
+ int new_count = cpu + 1;
+ int new_space, size;
char *new_start;
- per_cpu_info = realloc(per_cpu_info, new_max * sizeof(*per_cpu_info));
- if (!per_cpu_info) {
- fprintf(stderr, "Cannot allocate CPU info -- %d x %d bytes\n",
- new_max, (int) sizeof(*per_cpu_info));
+ size = new_count * sizeof(struct per_cpu_info);
+ cpus = realloc(cpus, size);
+ if (!cpus) {
+ char name[20];
+ fprintf(stderr, "Out of memory, CPU info for device %s (%d)\n",
+ get_dev_name(pdi, name, sizeof(name)), size);
exit(1);
}
- new_start = (char *)per_cpu_info + (max_cpus * sizeof(*per_cpu_info));
- new_space = (new_max - max_cpus) * sizeof(*per_cpu_info);
+ new_start = (char *)cpus + (ncpus * sizeof(struct per_cpu_info));
+ new_space = (new_count - ncpus) * sizeof(struct per_cpu_info);
memset(new_start, 0, new_space);
- max_cpus = new_max;
+
+ pdi->ncpus = new_count;
+ pdi->cpus = cpus;
+}
+
+static struct per_cpu_info *get_cpu_info(struct per_dev_info *pdi, int cpu)
+{
+ if (cpu >= pdi->ncpus)
+ resize_cpu_info(pdi, cpu);
+ return &pdi->cpus[cpu];
}
-static struct per_cpu_info *get_cpu_info(int cpu)
+
+static int resize_devices(char *name)
{
- struct per_cpu_info *pci;
+ int size = (ndevices + 1) * sizeof(struct per_dev_info);
- if (cpu >= max_cpus)
- resize_cpu_info(cpu);
+ devices = realloc(devices, size);
+ if (!devices) {
+ fprintf(stderr, "Out of memory, device %s (%d)\n", name, size);
+ return 1;
+ }
+ memset(&devices[ndevices], 0, sizeof(struct per_dev_info));
+ devices[ndevices].name = name;
+ ndevices++;
+ return 0;
+}
- /*
- * ->cpu might already be set, but just set it unconditionally
- */
- pci = &per_cpu_info[cpu];
- pci->cpu = cpu;
+static struct per_dev_info *get_dev_info(dev_t id, int create)
+{
+ int i;
- return pci;
+ for (i = 0; i < ndevices; i++)
+ if (devices[i].id == id)
+ return &devices[i];
+ if (!create)
+ return NULL;
+ if (resize_devices(NULL) != 0)
+ return NULL;
+ return &devices[ndevices-1];
}
-static inline void check_time(struct blk_io_trace *bit)
+static char *get_dev_name(struct per_dev_info *pdi, char *buffer, int size)
+{
+ if (pdi->name)
+ snprintf(buffer, size, "%s", pdi->name);
+ else
+ snprintf(buffer, size, "%d,%d", MAJOR(pdi->id), MINOR(pdi->id));
+ return buffer;
+}
+
+
+static void check_time(struct per_dev_info *pdi, struct blk_io_trace *bit)
{
unsigned long long this = bit->time;
- unsigned long long last = last_reported_time;
+ unsigned long long last = pdi->last_reported_time;
- backwards = (this < last) ? 'B' : ' ';
- last_reported_time = this;
+ pdi->backwards = (this < last) ? 'B' : ' ';
+ pdi->last_reported_time = this;
}
+
static inline void __account_m(struct io_stats *ios, struct blk_io_trace *t,
int rw)
{
rwbs[i] = '\0';
- sprintf(hstring, "%2d %8ld %5Lu.%09Lu %5u %c %3s",
- pci->cpu,
+ sprintf(hstring, "%3d,%-3d %2d %8ld %5Lu.%09Lu %5u %c %3s",
+ MAJOR(t->device), MINOR(t->device), pci->cpu,
(unsigned long)t->sequence, SECONDS(t->time),
NANO_SECONDS(t->time), t->pid, act, rwbs);
}
}
-static int dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci)
+static int dump_trace(struct blk_io_trace *t, struct per_cpu_info *pci,
+ struct per_dev_info *pdi)
{
int ret = 0;
else
dump_trace_fs(t, pci);
- events++;
+ pdi->events++;
return ret;
}
fprintf(ofp, "\n");
}
-static void show_cpu_stats(void)
+static void show_device_and_cpu_stats(void)
{
- struct per_cpu_info foo, *pci;
- struct io_stats *ios;
- int i, pci_events = 0;
-
- memset(&foo, 0, sizeof(foo));
-
- for (i = 0; i < max_cpus; i++) {
- char cpu[8];
-
- pci = &per_cpu_info[i];
- ios = &pci->io_stats;
-
- if (!pci->nelems)
- continue;
-
- foo.io_stats.qreads += ios->qreads;
- foo.io_stats.qwrites += ios->qwrites;
- foo.io_stats.creads += ios->creads;
- foo.io_stats.cwrites += ios->cwrites;
- foo.io_stats.mreads += ios->mreads;
- foo.io_stats.mwrites += ios->mwrites;
- foo.io_stats.ireads += ios->ireads;
- foo.io_stats.iwrites += ios->iwrites;
- foo.io_stats.qread_kb += ios->qread_kb;
- foo.io_stats.qwrite_kb += ios->qwrite_kb;
- foo.io_stats.cread_kb += ios->cread_kb;
- foo.io_stats.cwrite_kb += ios->cwrite_kb;
- foo.io_stats.iread_kb += ios->iread_kb;
- foo.io_stats.iwrite_kb += ios->iwrite_kb;
-
- snprintf(cpu, sizeof(cpu) - 1, "CPU%d:", i);
- dump_io_stats(ios, cpu);
- pci_events++;
- }
+ struct per_dev_info *pdi;
+ struct per_cpu_info *pci;
+ struct io_stats total, *ios;
+ int i, j, pci_events;
+ char line[3 + 8/*cpu*/ + 2 + 32/*dev*/ + 3];
+ char name[32];
+
+ for (pdi = devices, i = 0; i < ndevices; i++, pdi++) {
+
+ memset(&total, 0, sizeof(total));
+ pci_events = 0;
+
+ if (i > 0)
+ fprintf(ofp, "\n");
+
+ for (pci = pdi->cpus, j = 0; j < pdi->ncpus; j++, pci++) {
+ if (!pci->nelems)
+ continue;
+
+ ios = &pci->io_stats;
+ total.qreads += ios->qreads;
+ total.qwrites += ios->qwrites;
+ total.creads += ios->creads;
+ total.cwrites += ios->cwrites;
+ total.mreads += ios->mreads;
+ total.mwrites += ios->mwrites;
+ total.ireads += ios->ireads;
+ total.iwrites += ios->iwrites;
+ total.qread_kb += ios->qread_kb;
+ total.qwrite_kb += ios->qwrite_kb;
+ total.cread_kb += ios->cread_kb;
+ total.cwrite_kb += ios->cwrite_kb;
+ total.iread_kb += ios->iread_kb;
+ total.iwrite_kb += ios->iwrite_kb;
+
+ snprintf(line, sizeof(line) - 1, "CPU%d (%s):",
+ j, get_dev_name(pdi, name, sizeof(name)));
+ dump_io_stats(ios, line);
+ pci_events++;
+ }
- if (pci_events > 1) {
- fprintf(ofp, "\n");
- dump_io_stats(&foo.io_stats, "Total:");
- }
+ if (pci_events > 1) {
+ fprintf(ofp, "\n");
+ snprintf(line, sizeof(line) - 1, "Total (%s):",
+ get_dev_name(pdi, name, sizeof(name)));
+ dump_io_stats(&total, line);
+ }
- fprintf(ofp, "\nEvents: %'Lu\n", events);
+ fprintf(ofp, "Events (%s): %'Lu\n",
+ get_dev_name(pdi, line, sizeof(line)), pdi->events);
+ }
}
-#define min(a, b) ((a) < (b) ? (a) : (b))
-
static struct blk_io_trace *find_trace(void *p, unsigned long offset, int nr)
{
unsigned long max_offset = min(offset,nr * sizeof(struct blk_io_trace));
return NULL;
}
-static int sort_entries(void *traces, unsigned long offset, int nr)
+static int sort_entries(void *traces, unsigned long offset, int nr,
+ struct per_dev_info *fpdi, struct per_cpu_info *fpci)
{
+ struct per_dev_info *pdi;
struct per_cpu_info *pci;
struct blk_io_trace *bit;
struct trace *t;
void *start = traces;
- int nelems = 0;
while (traces - start <= offset - sizeof(*bit)) {
if (!nr)
break;
t = malloc(sizeof(*t));
+ if (!t) {
+ fprintf(stderr, "Out of memory, seq %d on dev %d,%d\n",
+ bit->sequence,
+ MAJOR(bit->device), MINOR(bit->device));
+ return -1;
+ }
t->bit = bit;
memset(&t->rb_node, 0, sizeof(t->rb_node));
trace_to_cpu(bit);
- if (verify_trace(bit))
+ if (verify_trace(bit)) {
+ free(t);
break;
+ }
- pci = get_cpu_info(bit->cpu);
+ pdi = fpdi ? fpdi : get_dev_info(bit->device, 1);
+ pdi->id = bit->device;
+ pci = fpci ? fpci : get_cpu_info(pdi, bit->cpu);
+ pci->cpu = bit->cpu;
pci->nelems++;
- if (trace_rb_insert(t))
+ if (trace_rb_insert(t)) {
+ free(t);
return -1;
+ }
traces += sizeof(*bit) + bit->pdu_len;
- nelems++;
nr--;
}
- return nelems;
+ return 0;
}
static void free_entries_rb(void)
static void show_entries_rb(void)
{
+ struct per_dev_info *pdi;
struct blk_io_trace *bit;
struct rb_node *n;
struct trace *t;
t = rb_entry(n, struct trace, rb_node);
bit = t->bit;
+ pdi = get_dev_info(bit->device, 0);
+ if (!pdi) {
+ fprintf(stderr, "Unknown device ID? (%d,%d)\n",
+ MAJOR(bit->device), MINOR(bit->device));
+ break;
+ }
cpu = bit->cpu;
- if (cpu > max_cpus) {
- fprintf(stderr, "CPU number too large (%d)\n", cpu);
+ if (cpu > pdi->ncpus) {
+ fprintf(stderr, "Unknown CPU ID? (%d, device %d,%d)\n",
+ cpu, MAJOR(bit->device), MINOR(bit->device));
break;
}
- if (genesis_time == 0)
- genesis_time = bit->time;
bit->time -= genesis_time;
- check_time(bit);
+ check_time(pdi, bit);
- if (dump_trace(bit, &per_cpu_info[cpu]))
+ if (dump_trace(bit, &pdi->cpus[cpu], pdi))
break;
} while ((n = rb_next(n)) != NULL);
static int do_file(void)
{
- int i, nfiles;
+ struct per_dev_info *pdi;
+ int i, j, nfiles = 0;
- for (i = 0, nfiles = 0;; i++, nfiles++) {
- struct per_cpu_info *pci;
- struct stat st;
- void *tb;
+ for (pdi = devices, i = 0; i < ndevices; i++, pdi++) {
+ for (j = 0;; j++, nfiles++) {
+ struct per_cpu_info *pci;
+ struct stat st;
+ void *tb;
- pci = get_cpu_info(i);
-
- snprintf(pci->fname, sizeof(pci->fname)-1,"%s_out.%d", dev, i);
- if (stat(pci->fname, &st) < 0)
- break;
- if (!st.st_size)
- continue;
+ pci = get_cpu_info(pdi, j);
+ pci->cpu = j;
- printf("Processing %s\n", pci->fname);
-
- tb = malloc(st.st_size);
-
- pci->fd = open(pci->fname, O_RDONLY);
- if (pci->fd < 0) {
- perror(pci->fname);
- break;
+ snprintf(pci->fname, sizeof(pci->fname)-1,
+ "%s_out.%d", pdi->name, j);
+ if (stat(pci->fname, &st) < 0)
+ break;
+ if (!st.st_size)
+ continue;
+
+ printf("Processing %s\n", pci->fname);
+
+ tb = malloc(st.st_size);
+ if (!tb) {
+ fprintf(stderr, "Out of memory, skip file %s\n",
+ pci->fname);
+ continue;
+ }
+
+ pci->fd = open(pci->fname, O_RDONLY);
+ if (pci->fd < 0) {
+ perror(pci->fname);
+ free(tb);
+ continue;
+ }
+
+ if (read_data(pci->fd, tb, st.st_size, 1)) {
+ close(pci->fd);
+ free(tb);
+ continue;
+ }
+
+ if (sort_entries(tb, st.st_size, ~0U, pdi, pci) == -1) {
+ close(pci->fd);
+ free(tb);
+ continue;
+ }
+
+ printf("Completed %s (CPU%d %d, entries)\n",
+ pci->fname, j, pci->nelems);
+ close(pci->fd);
}
-
- if (read_data(pci->fd, tb, st.st_size, 1))
- break;
-
- if (sort_entries(tb, st.st_size, ~0U) == -1)
- break;
-
- close(pci->fd);
- printf("\t%2d %10s %15d\n", i, pci->fname, pci->nelems);
-
}
if (!nfiles) {
if (!events)
break;
- if (sort_entries(ptr, ~0UL, events) == -1)
+ if (sort_entries(ptr, ~0UL, events, NULL, NULL) == -1)
break;
show_entries_rb();
static void usage(char *prog)
{
- fprintf(stderr, "Usage: %s -i <name> [-o <output>][-s]\n", prog);
+ fprintf(stderr, "Usage: %s [-i <name>] [-o <output>] [-s] <name>...\n",
+ prog);
}
int main(int argc, char *argv[])
while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) != -1) {
switch (c) {
case 'i':
- dev = optarg;
+ if (!strcmp(optarg, "-") && !pipeline)
+ pipeline = 1;
+ else if (resize_devices(optarg) != 0)
+ return 1;
break;
case 'o':
output_name = optarg;
}
}
- if (!dev) {
+ while (optind < argc) {
+ if (!strcmp(argv[optind], "-") && !pipeline)
+ pipeline = 1;
+ else if (resize_devices(argv[optind]) != 0)
+ return 1;
+ optind++;
+ }
+
+ if (!pipeline && !ndevices) {
usage(argv[0]);
return 1;
}
return 1;
}
- if (!strcmp(dev, "-"))
+ if (pipeline)
ret = do_stdin();
else
ret = do_file();
if (per_process_stats)
show_process_stats();
- show_cpu_stats();
+ show_device_and_cpu_stats();
flush_output();
return ret;
int ofd;
unsigned long events_processed;
+ struct device_information *device;
};
-static char *relay_path;
-
-#define is_done() (*(volatile int *)(&done))
-static volatile int done;
+struct device_information {
+ int fd;
+ char *path;
+ char buts_name[32];
+ int trace_started;
+ struct thread_information *threads;
+};
-static int devfd, ncpus;
+static int ncpus;
static struct thread_information *thread_information;
-static char buts_name[32];
-static char *dev;
+static int ndevs;
+static struct device_information *device_information;
+
+/* command line option globals */
+static char *relay_path;
static char *output_name;
static int act_mask = ~0U;
-static int trace_started;
static int kill_running_trace;
+#define is_done() (*(volatile int *)(&done))
+static volatile int done;
+
static pthread_mutex_t stdout_mutex = PTHREAD_MUTEX_INITIALIZER;
static void exit_trace(int status);
return -1;
}
-static int start_trace(char *dev)
+static int start_trace(struct device_information *dip)
{
struct blk_user_trace_setup buts;
buts.buf_nr = BUF_NR;
buts.act_mask = act_mask;
- if (ioctl(devfd, BLKSTARTTRACE, &buts) < 0) {
+ if (ioctl(dip->fd, BLKSTARTTRACE, &buts) < 0) {
perror("BLKSTARTTRACE");
return 1;
}
- memcpy(buts_name, buts.name, sizeof(buts_name));
- trace_started = 1;
+ memcpy(dip->buts_name, buts.name, sizeof(dip->buts_name));
+ dip->trace_started = 1;
return 0;
}
-static void stop_trace(void)
+static void stop_trace(struct device_information *dip)
{
- if (trace_started || kill_running_trace) {
- if (ioctl(devfd, BLKSTOPTRACE) < 0)
+ if (dip->trace_started || kill_running_trace) {
+ if (ioctl(dip->fd, BLKSTOPTRACE) < 0)
perror("BLKSTOPTRACE");
-
- trace_started = 0;
+ close(dip->fd);
+ dip->trace_started = 0;
}
}
+static void stop_all_traces(void)
+{
+ struct device_information *dip;
+ int i;
+
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++)
+ stop_trace(dip);
+}
+
static void *extract_data(struct thread_information *tip, char *ofn, int nb)
{
int ret, bytes_left;
exit_trace(1);
}
- snprintf(tip->fn, sizeof(tip->fn),
- "%s/block/%s/trace%d", relay_path, buts_name, tip->cpu);
+ snprintf(tip->fn, sizeof(tip->fn), "%s/block/%s/trace%d",
+ relay_path, tip->device->buts_name, tip->cpu);
tip->fd = open(tip->fn, O_RDONLY);
if (tip->fd < 0) {
perror(tip->fn);
return NULL;
}
-static int start_threads(void)
+static int start_threads(struct device_information *dip)
{
struct thread_information *tip;
char op[64];
- int i;
+ int j, pipeline = output_name && !strcmp(output_name, "-");
- ncpus = sysconf(_SC_NPROCESSORS_ONLN);
- if (ncpus < 0) {
- fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed\n");
- return 0;
- }
-
- thread_information = malloc(ncpus * sizeof(struct thread_information));
- for (i = 0, tip = thread_information; i < ncpus; i++, tip++) {
+ for (tip = dip->threads, j = 0; j < ncpus; j++, tip++) {
+ tip->cpu = j;
+ tip->device = dip;
tip->fd_lock = NULL;
- tip->cpu = i;
tip->events_processed = 0;
- if (!strcmp(output_name, "-")) {
+ if (pipeline) {
tip->ofd = dup(STDOUT_FILENO);
tip->fd_lock = &stdout_mutex;
} else {
- sprintf(op, "%s_out.%d", output_name, tip->cpu);
+ if (output_name)
+ sprintf(op, "%s_%s_out.%d", output_name,
+ dip->buts_name, tip->cpu);
+ else
+ sprintf(op, "%s_out.%d",
+ dip->buts_name, tip->cpu);
tip->ofd = open(op, O_CREAT|O_TRUNC|O_WRONLY, 0644);
}
if (tip->ofd < 0) {
perror(op);
- return 0;
+ return 1;
}
if (pthread_create(&tip->thread, NULL, extract, tip)) {
- perror( "pthread_create");
- return 0;
+ perror("pthread_create");
+ close(tip->ofd);
+ return 1;
}
}
- return ncpus;
+ return 0;
}
static void close_thread(struct thread_information *tip)
tip->fd = tip->ofd = -1;
}
-static void stop_threads(void)
+static void stop_threads(struct device_information *dip)
{
- struct thread_information *tip = thread_information;
- int i;
-
- for (i = 0; i < ncpus; i++, tip++) {
- long ret;
+ struct thread_information *tip;
+ long ret;
+ int j;
+ for (tip = dip->threads, j = 0; j < ncpus; j++, tip++) {
if (pthread_join(tip->thread, (void *) &ret))
perror("thread_join");
close_thread(tip);
}
}
-static void stop_tracing(void)
+static void stop_all_threads(void)
{
- struct thread_information *tip = thread_information;
+ struct device_information *dip;
int i;
- for (i = 0; i < ncpus; i++, tip++)
- close_thread(tip);
- stop_trace();
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++)
+ stop_threads(dip);
+}
+
+static void stop_all_tracing(void)
+{
+ struct device_information *dip;
+ struct thread_information *tip;
+ int i, j;
+
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++) {
+ for (tip = dip->threads, j = 0; j < ncpus; j++, tip++)
+ close_thread(tip);
+ stop_trace(dip);
+ }
}
static void exit_trace(int status)
{
- stop_tracing();
+ stop_all_tracing();
exit(status);
}
-static void show_stats(void)
+static int resize_devices(char *path)
+{
+ int size = (ndevs + 1) * sizeof(struct device_information);
+
+ device_information = realloc(device_information, size);
+ if (!device_information) {
+ fprintf(stderr, "Out of memory, device %s (%d)\n", path, size);
+ return 1;
+ }
+ device_information[ndevs].path = path;
+ ndevs++;
+ return 0;
+}
+
+static int open_devices(void)
{
+ struct device_information *dip;
int i;
- struct thread_information *tip;
- unsigned long events_processed = 0;
- if (!strcmp(output_name, "-"))
- return;
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++) {
+ dip->fd = open(dip->path, O_RDONLY);
+ if (dip->fd < 0) {
+ perror(dip->path);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int start_devices(void)
+{
+ struct device_information *dip;
+ int i, j, size;
+
+ size = ncpus * sizeof(struct thread_information);
+ thread_information = malloc(size * ndevs);
+ if (!thread_information) {
+ fprintf(stderr, "Out of memory, threads (%d)\n", size * ndevs);
+ return 1;
+ }
- for (i = 0, tip = thread_information; i < ncpus; i++, tip++) {
- printf("CPU%3d: %20ld events\n",
- tip->cpu, tip->events_processed);
- events_processed += tip->events_processed;
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++) {
+ if (start_trace(dip)) {
+ close(dip->fd);
+ fprintf(stderr, "Failed to start trace on %s\n",
+ dip->path);
+ break;
+ }
+ }
+ if (i != ndevs) {
+ for (dip = device_information, j = 0; j < i; j++, dip++)
+ stop_trace(dip);
+ return 1;
+ }
+
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++) {
+ dip->threads = thread_information + (i * ncpus);
+ if (start_threads(dip)) {
+ fprintf(stderr, "Failed to start worker threads\n");
+ break;
+ }
+ }
+ if (i != ndevs) {
+ for (dip = device_information, j = 0; j < i; j++, dip++)
+ stop_threads(dip);
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++)
+ stop_trace(dip);
+ return 1;
}
- printf("Total: %20ld events\n", events_processed);
+ return 0;
}
+static void show_stats(void)
+{
+ int i, j;
+ struct device_information *dip;
+ struct thread_information *tip;
+ unsigned long long events_processed;
+
+ if (output_name && !strcmp(output_name, "-"))
+ return;
+
+ for (dip = device_information, i = 0; i < ndevs; i++, dip++) {
+ printf("Device: %s\n", dip->path);
+ events_processed = 0;
+ for (tip = dip->threads, j = 0; j < ncpus; j++, tip++) {
+ printf(" CPU%3d: %20ld events\n",
+ tip->cpu, tip->events_processed);
+ events_processed += tip->events_processed;
+ }
+ printf(" Total: %20lld events\n", events_processed);
+ }
+}
+
static void show_usage(char *program)
{
fprintf(stderr,"Usage: %s [-d <dev>] "
break;
case 'd':
- dev = optarg;
+ if (resize_devices(optarg) != 0)
+ return 1;
break;
case 'r':
}
}
- while (optind < argc)
- dev = argv[optind++];
+ while (optind < argc) {
+ if (resize_devices(argv[optind++]) != 0)
+ return 1;
+ }
- if (dev == NULL) {
+ if (ndevs == 0) {
show_usage(argv[0]);
return 1;
}
return 1;
}
- devfd = open(dev, O_RDONLY);
- if (devfd < 0) {
- perror(dev);
+ if (open_devices() != 0)
return 1;
- }
if (kill_running_trace) {
- stop_trace();
+ stop_all_traces();
return 0;
}
- if (start_trace(dev)) {
- close(devfd);
- fprintf(stderr, "Failed to start trace on %s\n", dev);
- return 1;
- }
-
setlocale(LC_NUMERIC, "en_US");
- if (!output_name)
- output_name = buts_name;
-
- i = start_threads();
- if (!i) {
- fprintf(stderr, "Failed to start worker threads\n");
- stop_trace();
+ ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ if (ncpus < 0) {
+ fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed\n");
return 1;
}
+ if (start_devices() != 0)
+ return 1;
+
signal(SIGINT, handle_sigint);
signal(SIGHUP, handle_sigint);
signal(SIGTERM, handle_sigint);
- atexit(stop_tracing);
+ atexit(stop_all_tracing);
while (!is_done())
sleep(1);
- stop_threads();
- stop_trace();
+ stop_all_threads();
+ stop_all_traces();
show_stats();
- close(devfd);
return 0;
}
#include "blktrace_api.h"
#define CHECK_MAGIC(t) (((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
-#define SUPPORTED_VERSION (0x04)
+#define SUPPORTED_VERSION (0x05)
#if defined(__LITTLE_ENDIAN_BITFIELD)
#define be16_to_cpu(x) __bswap_16(x)
t->cpu = cpu_to_be32(t->cpu);
t->error = cpu_to_be16(t->error);
t->pdu_len = cpu_to_be16(t->pdu_len);
+ t->device = cpu_to_be32(t->device);
/* t->comm is a string (endian neutral) */
}
t->cpu = be32_to_cpu(t->cpu);
t->error = be16_to_cpu(t->error);
t->pdu_len = be16_to_cpu(t->pdu_len);
+ t->device = be32_to_cpu(t->device);
/* t->comm is a string (endian neutral) */
}
#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
#define BLK_IO_TRACE_MAGIC 0x65617400
-#define BLK_IO_TRACE_VERSION 0x04
+#define BLK_IO_TRACE_VERSION 0x05
/*
* The trace itself
__u32 cpu; /* on what cpu did it happen */
__u16 error; /* completion error */
__u16 pdu_len; /* length of data after this trace */
+ __u32 device; /* device identifier (dev_t) */
char comm[16]; /* task command name (TASK_COMM_LEN) */
};
+++ /dev/null
-diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt
-diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
---- a/drivers/block/Kconfig
-+++ b/drivers/block/Kconfig
-@@ -419,6 +419,14 @@ config LBD
- your machine, or if you want to have a raid or loopback device
- bigger than 2TB. Otherwise say N.
-
-+config BLK_DEV_IO_TRACE
-+ bool "Support for tracing block io actions"
-+ select RELAYFS_FS
-+ help
-+ Say Y here, if you want to be able to trace the block layer actions
-+ on a given queue.
-+
-+
- config CDROM_PKTCDVD
- tristate "Packet writing on CD/DVD media"
- depends on !UML
-diff --git a/drivers/block/Makefile b/drivers/block/Makefile
---- a/drivers/block/Makefile
-+++ b/drivers/block/Makefile
-@@ -45,3 +45,5 @@ obj-$(CONFIG_VIODASD) += viodasd.o
- obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
- obj-$(CONFIG_BLK_DEV_UB) += ub.o
-
-+obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
-+
-diff --git a/drivers/block/elevator.c b/drivers/block/elevator.c
---- a/drivers/block/elevator.c
-+++ b/drivers/block/elevator.c
-@@ -34,6 +34,7 @@
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/compiler.h>
-+#include <linux/blktrace.h>
-
- #include <asm/uaccess.h>
-
-@@ -371,6 +372,9 @@ struct request *elv_next_request(request
- int ret;
-
- while ((rq = __elv_next_request(q)) != NULL) {
-+
-+ blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
-+
- /*
- * just mark as started even if we don't start it, a request
- * that has been delayed should not be passed by new incoming
-diff --git a/drivers/block/ioctl.c b/drivers/block/ioctl.c
---- a/drivers/block/ioctl.c
-+++ b/drivers/block/ioctl.c
-@@ -4,6 +4,7 @@
- #include <linux/backing-dev.h>
- #include <linux/buffer_head.h>
- #include <linux/smp_lock.h>
-+#include <linux/blktrace.h>
- #include <asm/uaccess.h>
-
- static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
-@@ -188,6 +189,10 @@ static int blkdev_locked_ioctl(struct fi
- return put_ulong(arg, bdev->bd_inode->i_size >> 9);
- case BLKGETSIZE64:
- return put_u64(arg, bdev->bd_inode->i_size);
-+ case BLKSTARTTRACE:
-+ return blk_start_trace(bdev, (char __user *) arg);
-+ case BLKSTOPTRACE:
-+ return blk_stop_trace(bdev);
- }
- return -ENOIOCTLCMD;
- }
-diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
---- a/drivers/block/ll_rw_blk.c
-+++ b/drivers/block/ll_rw_blk.c
-@@ -29,6 +29,7 @@
- #include <linux/swap.h>
- #include <linux/writeback.h>
- #include <linux/blkdev.h>
-+#include <linux/blktrace.h>
-
- /*
- * for max sense size
-@@ -1624,6 +1625,11 @@ void blk_cleanup_queue(request_queue_t *
- if (q->queue_tags)
- __blk_queue_free_tags(q);
-
-+ if (q->blk_trace) {
-+ blk_cleanup_trace(q->blk_trace);
-+ q->blk_trace = NULL;
-+ }
-+
- blk_queue_ordered(q, QUEUE_ORDERED_NONE);
-
- kmem_cache_free(requestq_cachep, q);
-@@ -1970,6 +1976,8 @@ rq_starved:
-
- rq_init(q, rq);
- rq->rl = rl;
-+
-+ blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ);
- out:
- return rq;
- }
-@@ -1998,6 +2006,8 @@ static struct request *get_request_wait(
- if (!rq) {
- struct io_context *ioc;
-
-+ blk_add_trace_generic(q, bio, rw, BLK_TA_SLEEPRQ);
-+
- __generic_unplug_device(q);
- spin_unlock_irq(q->queue_lock);
- io_schedule();
-@@ -2051,6 +2061,8 @@ EXPORT_SYMBOL(blk_get_request);
- */
- void blk_requeue_request(request_queue_t *q, struct request *rq)
- {
-+ blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
-+
- if (blk_rq_tagged(rq))
- blk_queue_end_tag(q, rq);
-
-@@ -2714,6 +2726,8 @@ static int __make_request(request_queue_
- if (!q->back_merge_fn(q, req, bio))
- break;
-
-+ blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
-+
- req->biotail->bi_next = bio;
- req->biotail = bio;
- req->nr_sectors = req->hard_nr_sectors += nr_sectors;
-@@ -2729,6 +2743,8 @@ static int __make_request(request_queue_
- if (!q->front_merge_fn(q, req, bio))
- break;
-
-+ blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
-+
- bio->bi_next = req->bio;
- req->bio = bio;
-
-@@ -2794,6 +2810,8 @@ get_rq:
- req->rq_disk = bio->bi_bdev->bd_disk;
- req->start_time = jiffies;
-
-+ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
-+
- spin_lock_irq(q->queue_lock);
- if (elv_queue_empty(q))
- blk_plug_device(q);
-@@ -3030,6 +3048,10 @@ end_io:
- blk_partition_remap(bio);
-
- ret = q->make_request_fn(q, bio);
-+
-+ if (ret)
-+ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
-+
- } while (ret);
- }
-
-@@ -3148,6 +3170,8 @@ static int __end_that_request_first(stru
- int total_bytes, bio_nbytes, error, next_idx = 0;
- struct bio *bio;
-
-+ blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
-+
- /*
- * extend uptodate bool to allow < 0 value to be direct io error
- */
-diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
---- a/include/linux/blkdev.h
-+++ b/include/linux/blkdev.h
-@@ -22,6 +22,7 @@ typedef struct request_queue request_que
- struct elevator_queue;
- typedef struct elevator_queue elevator_t;
- struct request_pm_state;
-+struct blk_trace;
-
- #define BLKDEV_MIN_RQ 4
- #define BLKDEV_MAX_RQ 128 /* Default maximum */
-@@ -412,6 +413,8 @@ struct request_queue
- */
- struct request *flush_rq;
- unsigned char ordered;
-+
-+ struct blk_trace *blk_trace;
- };
-
- enum {
-diff --git a/include/linux/fs.h b/include/linux/fs.h
---- a/include/linux/fs.h
-+++ b/include/linux/fs.h
-@@ -195,6 +195,8 @@ extern int dir_notify_enable;
- #define BLKBSZGET _IOR(0x12,112,size_t)
- #define BLKBSZSET _IOW(0x12,113,size_t)
- #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
-+#define BLKSTARTTRACE _IOWR(0x12,115,struct blk_user_trace_setup)
-+#define BLKSTOPTRACE _IO(0x12,116)
-
- #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
- #define FIBMAP _IO(0x00,1) /* bmap access */
---- /dev/null 2005-09-03 12:52:15.000000000 +0200
-+++ linux-2.6/drivers/block/blktrace.c 2005-09-08 08:33:20.000000000 +0200
-@@ -0,0 +1,222 @@
-+#include <linux/config.h>
-+#include <linux/kernel.h>
-+#include <linux/blkdev.h>
-+#include <linux/blktrace.h>
-+#include <linux/percpu.h>
-+#include <linux/init.h>
-+#include <asm/uaccess.h>
-+
-+static DEFINE_PER_CPU(unsigned long long, blk_trace_cpu_offset) = { 0, };
-+
-+void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
-+ int rw, u32 what, int error, int pdu_len, char *pdu_data)
-+{
-+ struct blk_io_trace t;
-+ unsigned long flags;
-+ int cpu;
-+
-+ if (rw & (1 << BIO_RW_BARRIER))
-+ what |= BLK_TC_ACT(BLK_TC_BARRIER);
-+ if (rw & (1 << BIO_RW_SYNC))
-+ what |= BLK_TC_ACT(BLK_TC_SYNC);
-+
-+ if (rw & WRITE)
-+ what |= BLK_TC_ACT(BLK_TC_WRITE);
-+ else
-+ what |= BLK_TC_ACT(BLK_TC_READ);
-+
-+ if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
-+ return;
-+
-+ t.magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
-+ t.sequence = atomic_add_return(1, &bt->sequence);
-+
-+ cpu = get_cpu();
-+ t.cpu = cpu;
-+ t.time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
-+ put_cpu();
-+
-+ t.sector = sector;
-+ t.bytes = bytes;
-+ t.action = what;
-+ t.error = error;
-+ t.pdu_len = pdu_len;
-+
-+ t.pid = current->pid;
-+ memcpy(t.comm, current->comm, sizeof(t.comm));
-+
-+ local_irq_save(flags);
-+ __relay_write(bt->rchan, &t, sizeof(t));
-+ if (pdu_len)
-+ __relay_write(bt->rchan, pdu_data, pdu_len);
-+ local_irq_restore(flags);
-+}
-+
-+static struct dentry *blk_tree_root;
-+static DECLARE_MUTEX(blk_tree_mutex);
-+
-+static inline void blk_remove_root(void)
-+{
-+ if (relayfs_remove_dir(blk_tree_root) != -ENOTEMPTY)
-+ blk_tree_root = NULL;
-+}
-+
-+static void blk_remove_tree(struct dentry *dir)
-+{
-+ down(&blk_tree_mutex);
-+ relayfs_remove_dir(dir);
-+ blk_remove_root();
-+ up(&blk_tree_mutex);
-+}
-+
-+static struct dentry *blk_create_tree(const char *blk_name)
-+{
-+ struct dentry *dir = NULL;
-+
-+ down(&blk_tree_mutex);
-+
-+ if (!blk_tree_root) {
-+ blk_tree_root = relayfs_create_dir("block", NULL);
-+ if (!blk_tree_root)
-+ goto err;
-+ }
-+
-+ dir = relayfs_create_dir(blk_name, blk_tree_root);
-+ if (!dir)
-+ blk_remove_root();
-+
-+err:
-+ up(&blk_tree_mutex);
-+ return dir;
-+}
-+
-+void blk_cleanup_trace(struct blk_trace *bt)
-+{
-+ relay_close(bt->rchan);
-+ blk_remove_tree(bt->dir);
-+ kfree(bt);
-+}
-+
-+int blk_stop_trace(struct block_device *bdev)
-+{
-+ request_queue_t *q = bdev_get_queue(bdev);
-+ struct blk_trace *bt = NULL;
-+ int ret = -EINVAL;
-+
-+ if (!q)
-+ return -ENXIO;
-+
-+ down(&bdev->bd_sem);
-+
-+ if (q->blk_trace) {
-+ bt = q->blk_trace;
-+ q->blk_trace = NULL;
-+ ret = 0;
-+ }
-+
-+ up(&bdev->bd_sem);
-+
-+ if (bt)
-+ blk_cleanup_trace(bt);
-+
-+ return ret;
-+}
-+
-+int blk_start_trace(struct block_device *bdev, char __user *arg)
-+{
-+ request_queue_t *q = bdev_get_queue(bdev);
-+ struct blk_user_trace_setup buts;
-+ struct blk_trace *bt = NULL;
-+ struct dentry *dir = NULL;
-+ char b[BDEVNAME_SIZE];
-+ int ret;
-+
-+ if (!q)
-+ return -ENXIO;
-+
-+ if (copy_from_user(&buts, arg, sizeof(buts)))
-+ return -EFAULT;
-+
-+ if (!buts.buf_size || !buts.buf_nr)
-+ return -EINVAL;
-+
-+ strcpy(buts.name, bdevname(bdev, b));
-+
-+ if (copy_to_user(arg, &buts, sizeof(buts)))
-+ return -EFAULT;
-+
-+ down(&bdev->bd_sem);
-+ ret = -EBUSY;
-+ if (q->blk_trace)
-+ goto err;
-+
-+ ret = -ENOMEM;
-+ bt = kmalloc(sizeof(*bt), GFP_KERNEL);
-+ if (!bt)
-+ goto err;
-+
-+ ret = -ENOENT;
-+ dir = blk_create_tree(bdevname(bdev, b));
-+ if (!dir)
-+ goto err;
-+
-+ bt->dir = dir;
-+ atomic_set(&bt->sequence, 0);
-+
-+ ret = -EIO;
-+ bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, NULL);
-+ if (!bt->rchan)
-+ goto err;
-+
-+ bt->act_mask = buts.act_mask;
-+ if (!bt->act_mask)
-+ bt->act_mask = (u16) -1;
-+
-+ q->blk_trace = bt;
-+ up(&bdev->bd_sem);
-+ return 0;
-+err:
-+ up(&bdev->bd_sem);
-+ if (dir)
-+ blk_remove_tree(dir);
-+ if (bt)
-+ kfree(bt);
-+ return ret;
-+}
-+
-+static void blk_trace_check_cpu_time(void *data)
-+{
-+ unsigned long long a, b, *t;
-+ struct timeval tv;
-+ int cpu = get_cpu();
-+
-+ t = &per_cpu(blk_trace_cpu_offset, cpu);
-+
-+ a = sched_clock();
-+ do_gettimeofday(&tv);
-+ b = sched_clock();
-+
-+ *t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
-+ *t -= (a + b) / 2;
-+ put_cpu();
-+}
-+
-+static int blk_trace_calibrate_offsets(void)
-+{
-+ unsigned long flags;
-+
-+ smp_call_function(blk_trace_check_cpu_time, NULL, 1, 1);
-+ local_irq_save(flags);
-+ blk_trace_check_cpu_time(NULL);
-+ local_irq_restore(flags);
-+
-+ return 0;
-+}
-+
-+static __init int blk_trace_init(void)
-+{
-+ return blk_trace_calibrate_offsets();
-+}
-+
-+module_init(blk_trace_init);
-+
---- /dev/null 2005-09-03 12:52:15.000000000 +0200
-+++ linux-2.6/include/linux/blktrace.h 2005-09-08 08:33:20.000000000 +0200
-@@ -0,0 +1,150 @@
-+#ifndef BLKTRACE_H
-+#define BLKTRACE_H
-+
-+#include <linux/config.h>
-+#include <linux/blkdev.h>
-+#include <linux/relayfs_fs.h>
-+
-+/*
-+ * Trace categories
-+ */
-+enum {
-+ BLK_TC_READ = 1 << 0, /* reads */
-+ BLK_TC_WRITE = 1 << 1, /* writes */
-+ BLK_TC_BARRIER = 1 << 2, /* barrier */
-+ BLK_TC_SYNC = 1 << 3, /* barrier */
-+ BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
-+ BLK_TC_REQUEUE = 1 << 5, /* requeueing */
-+ BLK_TC_ISSUE = 1 << 6, /* issue */
-+ BLK_TC_COMPLETE = 1 << 7, /* completions */
-+ BLK_TC_FS = 1 << 8, /* fs requests */
-+ BLK_TC_PC = 1 << 9, /* pc requests */
-+
-+ BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
-+};
-+
-+#define BLK_TC_SHIFT (16)
-+#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
-+
-+/*
-+ * Basic trace actions
-+ */
-+enum {
-+ __BLK_TA_QUEUE = 1, /* queued */
-+ __BLK_TA_BACKMERGE, /* back merged to existing rq */
-+ __BLK_TA_FRONTMERGE, /* front merge to existing rq */
-+ __BLK_TA_GETRQ, /* allocated new request */
-+ __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
-+ __BLK_TA_REQUEUE, /* request requeued */
-+ __BLK_TA_ISSUE, /* sent to driver */
-+ __BLK_TA_COMPLETE, /* completed by driver */
-+};
-+
-+/*
-+ * Trace actions in full. Additionally, read or write is masked
-+ */
-+#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
-+#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
-+#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
-+#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
-+
-+#define BLK_IO_TRACE_MAGIC 0x65617400
-+#define BLK_IO_TRACE_VERSION 0x04
-+
-+/*
-+ * The trace itself
-+ */
-+struct blk_io_trace {
-+ u32 magic; /* MAGIC << 8 | version */
-+ u32 sequence; /* event number */
-+ u64 time; /* in microseconds */
-+ u64 sector; /* disk offset */
-+ u32 bytes; /* transfer length */
-+ u32 action; /* what happened */
-+ u32 pid; /* who did it */
-+ u32 cpu; /* on what cpu did it happen */
-+ u16 error; /* completion error */
-+ u16 pdu_len; /* length of data after this trace */
-+ char comm[16]; /* task command name (TASK_COMM_LEN) */
-+};
-+
-+struct blk_trace {
-+ struct dentry *dir;
-+ struct rchan *rchan;
-+ atomic_t sequence;
-+ u16 act_mask;
-+};
-+
-+/*
-+ * User setup structure passed with BLKSTARTTRACE
-+ */
-+struct blk_user_trace_setup {
-+ char name[BDEVNAME_SIZE]; /* output */
-+ u16 act_mask; /* input */
-+ u32 buf_size; /* input */
-+ u32 buf_nr; /* input */
-+};
-+
-+#if defined(CONFIG_BLK_DEV_IO_TRACE)
-+extern int blk_start_trace(struct block_device *, char __user *);
-+extern int blk_stop_trace(struct block_device *);
-+extern void blk_cleanup_trace(struct blk_trace *);
-+extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, char *);
-+
-+static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
-+ u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+ int rw = rq->flags & 0x07;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ if (blk_pc_request(rq)) {
-+ what |= BLK_TC_ACT(BLK_TC_PC);
-+ __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);
-+ } else {
-+ what |= BLK_TC_ACT(BLK_TC_FS);
-+ __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, rw, what, rq->errors, 0, NULL);
-+ }
-+}
-+
-+static inline void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
-+ u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
-+}
-+
-+static inline void blk_add_trace_generic(struct request_queue *q,
-+ struct bio *bio, int rw, u32 what)
-+{
-+ struct blk_trace *bt = q->blk_trace;
-+
-+ if (likely(!bt))
-+ return;
-+
-+ if (bio)
-+ blk_add_trace_bio(q, bio, what);
-+ else
-+ __blk_add_trace(bt, 0, 0, rw, what, 0, 0, NULL);
-+}
-+
-+#else /* !CONFIG_BLK_DEV_IO_TRACE */
-+#define blk_start_trace(bdev, arg) (-EINVAL)
-+#define blk_stop_trace(bdev) (-EINVAL)
-+#define blk_cleanup_trace(bt) do { } while (0)
-+#define blk_add_trace_rq(q, rq, what) do { } while (0)
-+#define blk_add_trace_bio(q, rq, what) do { } while (0)
-+#define blk_add_trace_generic(q, rq, rw, what) do { } while (0)
-+#endif /* CONFIG_BLK_DEV_IO_TRACE */
-+
-+#endif
--- /dev/null
+diff --git a/Documentation/fb/vesafb.txt b/Documentation/fb/vesafb.txt
+diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
+--- a/drivers/block/Kconfig
++++ b/drivers/block/Kconfig
+@@ -419,6 +419,14 @@ config LBD
+ your machine, or if you want to have a raid or loopback device
+ bigger than 2TB. Otherwise say N.
+
++config BLK_DEV_IO_TRACE
++ bool "Support for tracing block io actions"
++ select RELAYFS_FS
++ help
++ Say Y here, if you want to be able to trace the block layer actions
++ on a given queue.
++
++
+ config CDROM_PKTCDVD
+ tristate "Packet writing on CD/DVD media"
+ depends on !UML
+diff --git a/drivers/block/Makefile b/drivers/block/Makefile
+--- a/drivers/block/Makefile
++++ b/drivers/block/Makefile
+@@ -45,3 +45,5 @@ obj-$(CONFIG_VIODASD) += viodasd.o
+ obj-$(CONFIG_BLK_DEV_SX8) += sx8.o
+ obj-$(CONFIG_BLK_DEV_UB) += ub.o
+
++obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
++
+diff --git a/drivers/block/blktrace.c b/drivers/block/blktrace.c
+--- a/drivers/block/blktrace.c
++++ b/drivers/block/blktrace.c
+@@ -36,6 +36,7 @@ void __blk_add_trace(struct blk_trace *b
+ t.time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
+ put_cpu();
+
++ t.device = bt->dev;
+ t.sector = sector;
+ t.bytes = bytes;
+ t.action = what;
+@@ -161,6 +162,7 @@ int blk_start_trace(struct block_device
+ goto err;
+
+ bt->dir = dir;
++ bt->dev = bdev->bd_dev;
+ atomic_set(&bt->sequence, 0);
+
+ ret = -EIO;
+diff --git a/drivers/block/cfq-iosched.c b/drivers/block/cfq-iosched.c
+--- a/drivers/block/cfq-iosched.c
++++ b/drivers/block/cfq-iosched.c
+@@ -2260,6 +2260,8 @@ static void cfq_put_cfqd(struct cfq_data
+ if (!atomic_dec_and_test(&cfqd->ref))
+ return;
+
++ blk_put_queue(q);
++
+ cfq_shutdown_timer_wq(cfqd);
+ q->elevator->elevator_data = NULL;
+
+@@ -2316,6 +2318,7 @@ static int cfq_init_queue(request_queue_
+ e->elevator_data = cfqd;
+
+ cfqd->queue = q;
++ atomic_inc(&q->refcnt);
+
+ cfqd->max_queued = q->nr_requests / 4;
+ q->nr_batching = cfq_queued;
+diff --git a/drivers/block/elevator.c b/drivers/block/elevator.c
+--- a/drivers/block/elevator.c
++++ b/drivers/block/elevator.c
+@@ -34,6 +34,7 @@
+ #include <linux/slab.h>
+ #include <linux/init.h>
+ #include <linux/compiler.h>
++#include <linux/blktrace.h>
+
+ #include <asm/uaccess.h>
+
+@@ -371,6 +372,9 @@ struct request *elv_next_request(request
+ int ret;
+
+ while ((rq = __elv_next_request(q)) != NULL) {
++
++ blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
++
+ /*
+ * just mark as started even if we don't start it, a request
+ * that has been delayed should not be passed by new incoming
+diff --git a/drivers/block/ioctl.c b/drivers/block/ioctl.c
+--- a/drivers/block/ioctl.c
++++ b/drivers/block/ioctl.c
+@@ -4,6 +4,7 @@
+ #include <linux/backing-dev.h>
+ #include <linux/buffer_head.h>
+ #include <linux/smp_lock.h>
++#include <linux/blktrace.h>
+ #include <asm/uaccess.h>
+
+ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
+@@ -188,6 +189,10 @@ static int blkdev_locked_ioctl(struct fi
+ return put_ulong(arg, bdev->bd_inode->i_size >> 9);
+ case BLKGETSIZE64:
+ return put_u64(arg, bdev->bd_inode->i_size);
++ case BLKSTARTTRACE:
++ return blk_start_trace(bdev, (char __user *) arg);
++ case BLKSTOPTRACE:
++ return blk_stop_trace(bdev);
+ }
+ return -ENOIOCTLCMD;
+ }
+diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
+--- a/drivers/block/ll_rw_blk.c
++++ b/drivers/block/ll_rw_blk.c
+@@ -29,6 +29,7 @@
+ #include <linux/swap.h>
+ #include <linux/writeback.h>
+ #include <linux/blkdev.h>
++#include <linux/blktrace.h>
+
+ /*
+ * for max sense size
+@@ -1624,6 +1625,11 @@ void blk_cleanup_queue(request_queue_t *
+ if (q->queue_tags)
+ __blk_queue_free_tags(q);
+
++ if (q->blk_trace) {
++ blk_cleanup_trace(q->blk_trace);
++ q->blk_trace = NULL;
++ }
++
+ blk_queue_ordered(q, QUEUE_ORDERED_NONE);
+
+ kmem_cache_free(requestq_cachep, q);
+@@ -1970,6 +1976,8 @@ rq_starved:
+
+ rq_init(q, rq);
+ rq->rl = rl;
++
++ blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ);
+ out:
+ return rq;
+ }
+@@ -1998,6 +2006,8 @@ static struct request *get_request_wait(
+ if (!rq) {
+ struct io_context *ioc;
+
++ blk_add_trace_generic(q, bio, rw, BLK_TA_SLEEPRQ);
++
+ __generic_unplug_device(q);
+ spin_unlock_irq(q->queue_lock);
+ io_schedule();
+@@ -2051,6 +2061,8 @@ EXPORT_SYMBOL(blk_get_request);
+ */
+ void blk_requeue_request(request_queue_t *q, struct request *rq)
+ {
++ blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
++
+ if (blk_rq_tagged(rq))
+ blk_queue_end_tag(q, rq);
+
+@@ -2714,6 +2726,8 @@ static int __make_request(request_queue_
+ if (!q->back_merge_fn(q, req, bio))
+ break;
+
++ blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
++
+ req->biotail->bi_next = bio;
+ req->biotail = bio;
+ req->nr_sectors = req->hard_nr_sectors += nr_sectors;
+@@ -2729,6 +2743,8 @@ static int __make_request(request_queue_
+ if (!q->front_merge_fn(q, req, bio))
+ break;
+
++ blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
++
+ bio->bi_next = req->bio;
+ req->bio = bio;
+
+@@ -2794,6 +2810,8 @@ get_rq:
+ req->rq_disk = bio->bi_bdev->bd_disk;
+ req->start_time = jiffies;
+
++ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
++
+ spin_lock_irq(q->queue_lock);
+ if (elv_queue_empty(q))
+ blk_plug_device(q);
+@@ -3030,6 +3048,10 @@ end_io:
+ blk_partition_remap(bio);
+
+ ret = q->make_request_fn(q, bio);
++
++ if (ret)
++ blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
++
+ } while (ret);
+ }
+
+@@ -3148,6 +3170,8 @@ static int __end_that_request_first(stru
+ int total_bytes, bio_nbytes, error, next_idx = 0;
+ struct bio *bio;
+
++ blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
++
+ /*
+ * extend uptodate bool to allow < 0 value to be direct io error
+ */
+diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
+--- a/include/linux/blkdev.h
++++ b/include/linux/blkdev.h
+@@ -22,6 +22,7 @@ typedef struct request_queue request_que
+ struct elevator_queue;
+ typedef struct elevator_queue elevator_t;
+ struct request_pm_state;
++struct blk_trace;
+
+ #define BLKDEV_MIN_RQ 4
+ #define BLKDEV_MAX_RQ 128 /* Default maximum */
+@@ -412,6 +413,8 @@ struct request_queue
+ */
+ struct request *flush_rq;
+ unsigned char ordered;
++
++ struct blk_trace *blk_trace;
+ };
+
+ enum {
+diff --git a/include/linux/blktrace.h b/include/linux/blktrace.h
+--- a/include/linux/blktrace.h
++++ b/include/linux/blktrace.h
+@@ -53,7 +53,7 @@ enum {
+ #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
+
+ #define BLK_IO_TRACE_MAGIC 0x65617400
+-#define BLK_IO_TRACE_VERSION 0x04
++#define BLK_IO_TRACE_VERSION 0x05
+
+ /*
+ * The trace itself
+@@ -69,6 +69,7 @@ struct blk_io_trace {
+ u32 cpu; /* on what cpu did it happen */
+ u16 error; /* completion error */
+ u16 pdu_len; /* length of data after this trace */
++ u32 device /* device number */
+ char comm[16]; /* task command name (TASK_COMM_LEN) */
+ };
+
+@@ -76,6 +77,7 @@ struct blk_trace {
+ struct dentry *dir;
+ struct rchan *rchan;
+ atomic_t sequence;
++ u32 dev;
+ u16 act_mask;
+ };
+
+diff --git a/include/linux/fs.h b/include/linux/fs.h
+--- a/include/linux/fs.h
++++ b/include/linux/fs.h
+@@ -196,6 +196,8 @@ extern int dir_notify_enable;
+ #define BLKBSZGET _IOR(0x12,112,size_t)
+ #define BLKBSZSET _IOW(0x12,113,size_t)
+ #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
++#define BLKSTARTTRACE _IOWR(0x12,115,struct blk_user_trace_setup)
++#define BLKSTOPTRACE _IO(0x12,116)
+
+ #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
+ #define FIBMAP _IO(0x00,1) /* bmap access */
+--- /dev/null 2005-09-03 12:52:15.000000000 +0200
++++ linux-2.6/drivers/block/blktrace.c 2005-09-12 09:46:27.000000000 +0200
+@@ -0,0 +1,224 @@
++#include <linux/config.h>
++#include <linux/kernel.h>
++#include <linux/blkdev.h>
++#include <linux/blktrace.h>
++#include <linux/percpu.h>
++#include <linux/init.h>
++#include <asm/uaccess.h>
++
++static DEFINE_PER_CPU(unsigned long long, blk_trace_cpu_offset) = { 0, };
++
++void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
++ int rw, u32 what, int error, int pdu_len, char *pdu_data)
++{
++ struct blk_io_trace t;
++ unsigned long flags;
++ int cpu;
++
++ if (rw & (1 << BIO_RW_BARRIER))
++ what |= BLK_TC_ACT(BLK_TC_BARRIER);
++ if (rw & (1 << BIO_RW_SYNC))
++ what |= BLK_TC_ACT(BLK_TC_SYNC);
++
++ if (rw & WRITE)
++ what |= BLK_TC_ACT(BLK_TC_WRITE);
++ else
++ what |= BLK_TC_ACT(BLK_TC_READ);
++
++ if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
++ return;
++
++ t.magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
++ t.sequence = atomic_add_return(1, &bt->sequence);
++
++ cpu = get_cpu();
++ t.cpu = cpu;
++ t.time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
++ put_cpu();
++
++ t.device = bt->dev;
++ t.sector = sector;
++ t.bytes = bytes;
++ t.action = what;
++ t.error = error;
++ t.pdu_len = pdu_len;
++
++ t.pid = current->pid;
++ memcpy(t.comm, current->comm, sizeof(t.comm));
++
++ local_irq_save(flags);
++ __relay_write(bt->rchan, &t, sizeof(t));
++ if (pdu_len)
++ __relay_write(bt->rchan, pdu_data, pdu_len);
++ local_irq_restore(flags);
++}
++
++static struct dentry *blk_tree_root;
++static DECLARE_MUTEX(blk_tree_mutex);
++
++static inline void blk_remove_root(void)
++{
++ if (relayfs_remove_dir(blk_tree_root) != -ENOTEMPTY)
++ blk_tree_root = NULL;
++}
++
++static void blk_remove_tree(struct dentry *dir)
++{
++ down(&blk_tree_mutex);
++ relayfs_remove_dir(dir);
++ blk_remove_root();
++ up(&blk_tree_mutex);
++}
++
++static struct dentry *blk_create_tree(const char *blk_name)
++{
++ struct dentry *dir = NULL;
++
++ down(&blk_tree_mutex);
++
++ if (!blk_tree_root) {
++ blk_tree_root = relayfs_create_dir("block", NULL);
++ if (!blk_tree_root)
++ goto err;
++ }
++
++ dir = relayfs_create_dir(blk_name, blk_tree_root);
++ if (!dir)
++ blk_remove_root();
++
++err:
++ up(&blk_tree_mutex);
++ return dir;
++}
++
++void blk_cleanup_trace(struct blk_trace *bt)
++{
++ relay_close(bt->rchan);
++ blk_remove_tree(bt->dir);
++ kfree(bt);
++}
++
++int blk_stop_trace(struct block_device *bdev)
++{
++ request_queue_t *q = bdev_get_queue(bdev);
++ struct blk_trace *bt = NULL;
++ int ret = -EINVAL;
++
++ if (!q)
++ return -ENXIO;
++
++ down(&bdev->bd_sem);
++
++ if (q->blk_trace) {
++ bt = q->blk_trace;
++ q->blk_trace = NULL;
++ ret = 0;
++ }
++
++ up(&bdev->bd_sem);
++
++ if (bt)
++ blk_cleanup_trace(bt);
++
++ return ret;
++}
++
++int blk_start_trace(struct block_device *bdev, char __user *arg)
++{
++ request_queue_t *q = bdev_get_queue(bdev);
++ struct blk_user_trace_setup buts;
++ struct blk_trace *bt = NULL;
++ struct dentry *dir = NULL;
++ char b[BDEVNAME_SIZE];
++ int ret;
++
++ if (!q)
++ return -ENXIO;
++
++ if (copy_from_user(&buts, arg, sizeof(buts)))
++ return -EFAULT;
++
++ if (!buts.buf_size || !buts.buf_nr)
++ return -EINVAL;
++
++ strcpy(buts.name, bdevname(bdev, b));
++
++ if (copy_to_user(arg, &buts, sizeof(buts)))
++ return -EFAULT;
++
++ down(&bdev->bd_sem);
++ ret = -EBUSY;
++ if (q->blk_trace)
++ goto err;
++
++ ret = -ENOMEM;
++ bt = kmalloc(sizeof(*bt), GFP_KERNEL);
++ if (!bt)
++ goto err;
++
++ ret = -ENOENT;
++ dir = blk_create_tree(bdevname(bdev, b));
++ if (!dir)
++ goto err;
++
++ bt->dir = dir;
++ bt->dev = bdev->bd_dev;
++ atomic_set(&bt->sequence, 0);
++
++ ret = -EIO;
++ bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, NULL);
++ if (!bt->rchan)
++ goto err;
++
++ bt->act_mask = buts.act_mask;
++ if (!bt->act_mask)
++ bt->act_mask = (u16) -1;
++
++ q->blk_trace = bt;
++ up(&bdev->bd_sem);
++ return 0;
++err:
++ up(&bdev->bd_sem);
++ if (dir)
++ blk_remove_tree(dir);
++ if (bt)
++ kfree(bt);
++ return ret;
++}
++
++static void blk_trace_check_cpu_time(void *data)
++{
++ unsigned long long a, b, *t;
++ struct timeval tv;
++ int cpu = get_cpu();
++
++ t = &per_cpu(blk_trace_cpu_offset, cpu);
++
++ a = sched_clock();
++ do_gettimeofday(&tv);
++ b = sched_clock();
++
++ *t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
++ *t -= (a + b) / 2;
++ put_cpu();
++}
++
++static int blk_trace_calibrate_offsets(void)
++{
++ unsigned long flags;
++
++ smp_call_function(blk_trace_check_cpu_time, NULL, 1, 1);
++ local_irq_save(flags);
++ blk_trace_check_cpu_time(NULL);
++ local_irq_restore(flags);
++
++ return 0;
++}
++
++static __init int blk_trace_init(void)
++{
++ return blk_trace_calibrate_offsets();
++}
++
++module_init(blk_trace_init);
++
+--- /dev/null 2005-09-03 12:52:15.000000000 +0200
++++ linux-2.6/include/linux/blktrace.h 2005-09-12 09:46:53.000000000 +0200
+@@ -0,0 +1,152 @@
++#ifndef BLKTRACE_H
++#define BLKTRACE_H
++
++#include <linux/config.h>
++#include <linux/blkdev.h>
++#include <linux/relayfs_fs.h>
++
++/*
++ * Trace categories
++ */
++enum {
++ BLK_TC_READ = 1 << 0, /* reads */
++ BLK_TC_WRITE = 1 << 1, /* writes */
++ BLK_TC_BARRIER = 1 << 2, /* barrier */
++ BLK_TC_SYNC = 1 << 3, /* barrier */
++ BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
++ BLK_TC_REQUEUE = 1 << 5, /* requeueing */
++ BLK_TC_ISSUE = 1 << 6, /* issue */
++ BLK_TC_COMPLETE = 1 << 7, /* completions */
++ BLK_TC_FS = 1 << 8, /* fs requests */
++ BLK_TC_PC = 1 << 9, /* pc requests */
++
++ BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
++};
++
++#define BLK_TC_SHIFT (16)
++#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
++
++/*
++ * Basic trace actions
++ */
++enum {
++ __BLK_TA_QUEUE = 1, /* queued */
++ __BLK_TA_BACKMERGE, /* back merged to existing rq */
++ __BLK_TA_FRONTMERGE, /* front merge to existing rq */
++ __BLK_TA_GETRQ, /* allocated new request */
++ __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
++ __BLK_TA_REQUEUE, /* request requeued */
++ __BLK_TA_ISSUE, /* sent to driver */
++ __BLK_TA_COMPLETE, /* completed by driver */
++};
++
++/*
++ * Trace actions in full. Additionally, read or write is masked
++ */
++#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
++#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
++#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
++#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
++#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
++#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
++#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
++#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
++
++#define BLK_IO_TRACE_MAGIC 0x65617400
++#define BLK_IO_TRACE_VERSION 0x05
++
++/*
++ * The trace itself
++ */
++struct blk_io_trace {
++ u32 magic; /* MAGIC << 8 | version */
++ u32 sequence; /* event number */
++ u64 time; /* in microseconds */
++ u64 sector; /* disk offset */
++ u32 bytes; /* transfer length */
++ u32 action; /* what happened */
++ u32 pid; /* who did it */
++ u32 cpu; /* on what cpu did it happen */
++ u16 error; /* completion error */
++ u16 pdu_len; /* length of data after this trace */
++ u32 device /* device number */
++ char comm[16]; /* task command name (TASK_COMM_LEN) */
++};
++
++struct blk_trace {
++ struct dentry *dir;
++ struct rchan *rchan;
++ atomic_t sequence;
++ u32 dev;
++ u16 act_mask;
++};
++
++/*
++ * User setup structure passed with BLKSTARTTRACE
++ */
++struct blk_user_trace_setup {
++ char name[BDEVNAME_SIZE]; /* output */
++ u16 act_mask; /* input */
++ u32 buf_size; /* input */
++ u32 buf_nr; /* input */
++};
++
++#if defined(CONFIG_BLK_DEV_IO_TRACE)
++extern int blk_start_trace(struct block_device *, char __user *);
++extern int blk_stop_trace(struct block_device *);
++extern void blk_cleanup_trace(struct blk_trace *);
++extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, char *);
++
++static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
++ u32 what)
++{
++ struct blk_trace *bt = q->blk_trace;
++ int rw = rq->flags & 0x07;
++
++ if (likely(!bt))
++ return;
++
++ if (blk_pc_request(rq)) {
++ what |= BLK_TC_ACT(BLK_TC_PC);
++ __blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);
++ } else {
++ what |= BLK_TC_ACT(BLK_TC_FS);
++ __blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, rw, what, rq->errors, 0, NULL);
++ }
++}
++
++static inline void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
++ u32 what)
++{
++ struct blk_trace *bt = q->blk_trace;
++
++ if (likely(!bt))
++ return;
++
++ __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
++}
++
++static inline void blk_add_trace_generic(struct request_queue *q,
++ struct bio *bio, int rw, u32 what)
++{
++ struct blk_trace *bt = q->blk_trace;
++
++ if (likely(!bt))
++ return;
++
++ if (bio)
++ blk_add_trace_bio(q, bio, what);
++ else
++ __blk_add_trace(bt, 0, 0, rw, what, 0, 0, NULL);
++}
++
++#else /* !CONFIG_BLK_DEV_IO_TRACE */
++#define blk_start_trace(bdev, arg) (-EINVAL)
++#define blk_stop_trace(bdev) (-EINVAL)
++#define blk_cleanup_trace(bt) do { } while (0)
++#define blk_add_trace_rq(q, rq, what) do { } while (0)
++#define blk_add_trace_bio(q, rq, what) do { } while (0)
++#define blk_add_trace_generic(q, rq, rw, what) do { } while (0)
++#endif /* CONFIG_BLK_DEV_IO_TRACE */
++
++#endif
projects / blktrace.git / commitdiff