OBJS = args.o bt_timeline.o devmap.o devs.o dip_rb.o iostat.o latency.o \
misc.o output.o proc.o seek.o trace.o trace_complete.o trace_im.o \
trace_issue.o trace_queue.o trace_remap.o trace_requeue.o rbtree.o \
- mmap.o trace_plug.o bno_dump.o
+ mmap.o trace_plug.o bno_dump.o unplug_hist.o
all: depend $(PROGS)
#define SETBUFFER_SIZE (64 * 1024)
-#define S_OPTS "aAB:d:D:e:hi:I:l:M:o:p:q:s:S:t:T:Vv"
+#define S_OPTS "aAB:d:D:e:hi:I:l:M:o:p:q:s:S:t:T:u:Vv"
static struct option l_opts[] = {
{
.name = "seek-absolute",
.flag = NULL,
.val = 'T'
},
+ {
+ .name = "unplug-hist",
+ .has_arg = required_argument,
+ .flag = NULL,
+ .val = 'u'
+ },
{
.name = "version",
.has_arg = no_argument,
"[ -S <interval> | --iostat-interval=<interval> ]\n" \
"[ -t <sec> | --time-start=<sec> ]\n" \
"[ -T <sec> | --time-end=<sec> ]\n" \
+ "[ -u <output name> | --unplug-hist=<output name> ] \n" \
"[ -V | --version ]\n" \
"[ -v | --verbose ]\n\n";
sscanf(optarg, "%lf", &t_aend);
time_bounded = 1;
break;
+ case 'u':
+ unplug_hist_name = strdup(optarg);
+ break;
case 'v':
verbose = 1;
break;
char bt_timeline_version[] = "0.99.1";
char *devices, *exes, *input_name, *output_name, *seek_name, *bno_dump_name;
-char *d2c_name, *q2c_name, *per_io_name;
+char *d2c_name, *q2c_name, *per_io_name, *unplug_hist_name;
FILE *ranges_ofp, *avgs_ofp, *per_io_ofp;
int verbose, done, time_bounded, output_all_data, seek_absolute;
double t_astart, t_aend;
region_exit(&dip->regions);
seeki_exit(dip->seek_handle);
bno_dump_exit(dip->bno_dump_handle);
+ unplug_hist_exit(dip->unplug_hist_handle);
free(dip);
}
}
dip->map = dev_map_find(device);
dip->seek_handle = seeki_init(device);
dip->bno_dump_handle = bno_dump_init(device);
+ dip->unplug_hist_handle = unplug_hist_init(device);
latency_init(dip);
list_add_tail(&dip->hash_head, &dev_heads[DEV_HASH(device)]);
list_add_tail(&dip->all_head, &all_devs);
\title{\texttt{btt} User Guide}
\author{Alan D. Brunelle (Alan.Brunelle@hp.com)}
-\date{10 April 2007}
+\date{16 April 2007}
\begin{document}
\maketitle
\item[seek details] A data file containing all IO-to-IO
sector differences can be output, with details found in
section~\ref{sec:seek}.
+
+ \item[unplug histogram details] A data file per device containing
+ histogram output for the amount of IOs released at unplug time.
+ Section~\ref{sec:o-u} has more details.
\end{description}
\newpage\section{\label{sec:activity}Activity Data File}
[ -S <interval> | --iostat-interval=<interval> ]
[ -t <sec> | --time-start=<sec> ]
[ -T <sec> | --time-end=<sec> ]
+[ -u <output name> | --unplug-hist=<output name> ]
[ -V | --version ]
[ -v | --verbose ]
\end{verbatim}
\subsection{\label{sec:o-s}\texttt{--seeks}/\texttt{-s}}
- This option instruct \texttt{btt} to generate the seek data file
+ This option instructs \texttt{btt} to generate the seek data file
discussed in section~\ref{sec:seek}.
\subsection{\label{sec:o-S}\texttt{--iostat-interval}/\texttt{-S}}
trace chosen will be between the start time (or 0.0 if not
specified) and end time (or the end of the run) specified.
+\subsection{\label{sec:o-u}\texttt{--unplug-hist}/\texttt{-u}}
+
+ This option instructs \texttt{btt} to generate a data file containing
+ histogram information for \emph{unplug} traces on a per device
+ basis. It shows how many times an unplug was hit with a specified
+ number of IOs released. There are 21 output values into the file, as
+ follows:
+
+ \medskip
+ \begin{tabular}{ll}
+\textbf{X value} & \textbf{Representing Counts} \\\hline
+0 & 0\dots\/4 \\
+1 & 5\dots\/9 \\
+2 & 10\dots\/14 \\
+\dots & \dots\dots\\
+19 & 95\dots\/99 \\
+20 & 100+ \\
+ \end{tabular}
+
+ \medskip
+ The file name(s) generated use the text string passed as an argument for
+ the prefix, followed by the device identifier in \texttt{major,minor}
+ form, with a \texttt{.dat} extension (as an example, with \texttt{-u
+ up\_hist} specified on the command line: \texttt{up\_hist\_008,032.dat}.
+
\subsection{\label{sec:o-V}\texttt{--version}/\texttt{-V}}
Prints out the \texttt{btt} version, and exits.
16.379036+0.000005=16.379041
\end{verbatim}
-\newpage\section{\label{sec:appendix}Appendix: Sample \texttt{btt}
+\newpage\section*{\label{sec:appendix}Appendix: Sample \texttt{btt}
Output}
Here is a complete output file from a btt run, illustrating a lot of the
void *heads;
struct region_info regions;
struct devmap *map;
- void *seek_handle, *bno_dump_handle;
+ void *seek_handle, *bno_dump_handle, *unplug_hist_handle;
FILE *d2c_ofp, *q2c_ofp;
struct avgs_info avgs;
struct stats stats, all_stats;
extern char bt_timeline_version[], *devices, *exes, *input_name, *output_name;
extern char *seek_name, *iostat_name, *d2c_name, *q2c_name, *per_io_name;
-extern char *bno_dump_name;
+extern char *bno_dump_name, *unplug_hist_name;
extern double range_delta;
extern FILE *ranges_ofp, *avgs_ofp, *iostat_ofp, *per_io_ofp;
extern int verbose, done, time_bounded, output_all_data, seek_absolute;
/* trace_requeue.c */
void trace_requeue(struct io *r_iop);
+/* unplug_hist.c */
+void *unplug_hist_init(__u32 device);
+void unplug_hist_exit(void *arg);
+void unplug_hist_add(struct io *u_iop);
+
#include "inlines.h"
static inline void trace_unplug(struct io *u_iop, int is_timer)
{
+ unplug_hist_add(u_iop);
dip_unplug(u_iop->t.device, BIT_TIME(u_iop->t.time), is_timer);
io_release(u_iop);
}
--- /dev/null
+/*
+ * blktrace output analysis: generate a timeline & gather statistics
+ *
+ * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "globals.h"
+
+#define BKT_WIDTH 5
+#define MAX_BKT 19
+#define EXCESS_BKT 20
+#define NBKTS EXCESS_BKT
+
+struct hist_bkt {
+ __u32 dev;
+ int hist[NBKTS * sizeof(int)];
+};
+
+static struct file_info *unplug_hist_files = NULL;
+
+void *unplug_hist_init(__u32 device)
+{
+ struct hist_bkt *hbp;
+
+ if (unplug_hist_name == NULL) return NULL;
+
+ hbp = malloc(sizeof(*hbp));
+ hbp->dev = device;
+ memset(hbp->hist, 0, NBKTS * sizeof(int));
+
+ return hbp;
+}
+
+void unplug_hist_add(struct io *u_iop)
+{
+ struct d_info *dip;
+
+ assert(u_iop->t.pdu_len >= sizeof(__u64));
+
+ dip = __dip_find(u_iop->t.device);
+ if (dip && dip->unplug_hist_handle) {
+ __u64 *val = u_iop->pdu;
+ int n_unplugs = be64_to_cpu(*val);
+ struct hist_bkt * hbp = dip->unplug_hist_handle;
+ int idx = (n_unplugs / BKT_WIDTH) <= MAX_BKT ?: EXCESS_BKT;
+
+ assert((0 <= idx) && (idx <= EXCESS_BKT));
+ hbp->hist[idx]++;
+ }
+}
+
+void unplug_hist_exit(void *arg)
+{
+ if (arg) {
+ FILE *fp;
+ struct hist_bkt *hbp = arg;
+ int mjr = hbp->dev >> MINORBITS;
+ int mnr = hbp->dev & ((1 << MINORBITS) - 1);
+ char *oname = malloc(strlen(unplug_hist_name) + 32);
+
+ sprintf(oname, "%s_%03d,%03d.dat", unplug_hist_name, mjr, mnr);
+ if ((fp = fopen(oname, "w")) != NULL) {
+ int i;
+
+ for (i = 0; i < NBKTS; i++)
+ fprintf(fp, "%d %d\n", i, hbp->hist[i]);
+ fclose(fp);
+
+ }
+ else
+ perror(oname);
+
+ free(oname);
+ free(hbp);
+ }
+}
projects / blktrace.git / commitdiff