iolog: replace tp usage with workqueue
authorJens Axboe <axboe@fb.com>
Tue, 8 Dec 2015 18:35:39 +0000 (11:35 -0700)
committerJens Axboe <axboe@fb.com>
Tue, 8 Dec 2015 18:35:39 +0000 (11:35 -0700)
Now that workqueue.c is generic enough to handle any kind of
work offloading, convert the online log compression to workqueue
usage and kill off lib/tp.*

Signed-off-by: Jens Axboe <axboe@fb.com>
backend.c
fio.h
iolog.c
iolog.h
lib/tp.c [deleted file]
lib/tp.h [deleted file]
rate-submit.c
workqueue.h

index 01e0b3a..5c35757 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -54,7 +54,6 @@
 #include "lib/getrusage.h"
 #include "idletime.h"
 #include "err.h"
-#include "lib/tp.h"
 #include "workqueue.h"
 #include "lib/mountcheck.h"
 #include "rate-submit.h"
@@ -1554,8 +1553,8 @@ static void *thread_main(void *data)
                        goto err;
        }
 
-       if (td->flags & TD_F_COMPRESS_LOG)
-               tp_init(&td->tp_data);
+       if (iolog_compress_init(td))
+               goto err;
 
        fio_verify_init(td);
 
@@ -1661,8 +1660,7 @@ static void *thread_main(void *data)
        if (o->io_submit_mode == IO_MODE_OFFLOAD)
                workqueue_exit(&td->io_wq);
 
-       if (td->flags & TD_F_COMPRESS_LOG)
-               tp_exit(&td->tp_data);
+       iolog_compress_exit(td);
 
        if (o->exec_postrun)
                exec_string(o, o->exec_postrun, (const char *)"postrun");
diff --git a/fio.h b/fio.h
index e4f778e..6f85266 100644 (file)
--- a/fio.h
+++ b/fio.h
@@ -129,7 +129,7 @@ struct thread_data {
        struct io_log *bw_log;
        struct io_log *iops_log;
 
-       struct tp_data *tp_data;
+       struct workqueue log_compress_wq;
 
        struct thread_data *parent;
 
diff --git a/iolog.c b/iolog.c
index d7c8a45..865722e 100644 (file)
--- a/iolog.c
+++ b/iolog.c
@@ -18,7 +18,6 @@
 #include "verify.h"
 #include "trim.h"
 #include "filelock.h"
-#include "lib/tp.h"
 
 static const char iolog_ver2[] = "fio version 2 iolog";
 
@@ -672,7 +671,12 @@ static void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 #ifdef CONFIG_ZLIB
 
 struct iolog_flush_data {
-       struct tp_work work;
+       struct workqueue_work work;
+       pthread_mutex_t lock;
+       pthread_cond_t cv;
+       int wait;
+       volatile int done;
+       volatile int refs;
        struct io_log *log;
        void *samples;
        uint64_t nr_samples;
@@ -971,7 +975,7 @@ void flush_log(struct io_log *log, int do_append)
 
 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
 {
-       if (td->tp_data)
+       if (td->flags & TD_F_COMPRESS_LOG)
                iolog_flush(log, 1);
 
        if (trylock) {
@@ -997,7 +1001,7 @@ static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
  * the specified memory limitation. Compresses the previously stored
  * entries.
  */
-static int gz_work(struct tp_work *work)
+static int gz_work(struct submit_worker *sw, struct workqueue_work *work)
 {
        struct iolog_flush_data *data;
        struct iolog_compress *c;
@@ -1078,12 +1082,18 @@ static int gz_work(struct tp_work *work)
 
        ret = 0;
 done:
-       if (work->wait) {
-               work->done = 1;
-               pthread_cond_signal(&work->cv);
+       if (data->wait) {
+               int refs;
+
+               pthread_mutex_lock(&data->lock);
+               data->done = 1;
+               pthread_cond_signal(&data->cv);
+               refs = --data->refs;
+               pthread_mutex_unlock(&data->lock);
+               if (!refs)
+                       free(data);
        } else
                free(data);
-
        return ret;
 err:
        while (!flist_empty(&list)) {
@@ -1095,6 +1105,27 @@ err:
        goto done;
 }
 
+static struct workqueue_ops log_compress_wq_ops = {
+       .fn     = gz_work,
+};
+
+int iolog_compress_init(struct thread_data *td)
+{
+       if (!(td->flags & TD_F_COMPRESS_LOG))
+               return 0;
+
+       workqueue_init(td, &td->log_compress_wq, &log_compress_wq_ops, 1);
+       return 0;
+}
+
+void iolog_compress_exit(struct thread_data *td)
+{
+       if (!(td->flags & TD_F_COMPRESS_LOG))
+               return;
+
+       workqueue_exit(&td->log_compress_wq);
+}
+
 /*
  * Queue work item to compress the existing log entries. We copy the
  * samples, and reset the log sample count to 0 (so the logging will
@@ -1103,7 +1134,6 @@ err:
  */
 int iolog_flush(struct io_log *log, int wait)
 {
-       struct tp_data *tdat = log->td->tp_data;
        struct iolog_flush_data *data;
        size_t sample_size;
 
@@ -1122,25 +1152,29 @@ int iolog_flush(struct io_log *log, int wait)
 
        memcpy(data->samples, log->log, sample_size);
        data->nr_samples = log->nr_samples;
-       data->work.fn = gz_work;
        log->nr_samples = 0;
 
        if (wait) {
-               pthread_mutex_init(&data->work.lock, NULL);
-               pthread_cond_init(&data->work.cv, NULL);
-               data->work.wait = 1;
+               pthread_mutex_init(&data->lock, NULL);
+               pthread_cond_init(&data->cv, NULL);
+               data->done = 0;
+               data->wait = 1;
+               data->refs = 2;
        } else
-               data->work.wait = 0;
+               data->wait = 0;
 
-       data->work.prio = 1;
-       tp_queue_work(tdat, &data->work);
+       workqueue_enqueue(&log->td->log_compress_wq, &data->work);
 
        if (wait) {
-               pthread_mutex_lock(&data->work.lock);
-               while (!data->work.done)
-                       pthread_cond_wait(&data->work.cv, &data->work.lock);
-               pthread_mutex_unlock(&data->work.lock);
-               free(data);
+               int refs;
+
+               pthread_mutex_lock(&data->lock);
+               while (!data->done)
+                       pthread_cond_wait(&data->cv, &data->lock);
+               refs = --data->refs;
+               pthread_mutex_unlock(&data->lock);
+               if (!refs)
+                       free(data);
        }
 
        return 0;
diff --git a/iolog.h b/iolog.h
index eb5fdf3..6f027ca 100644 (file)
--- a/iolog.h
+++ b/iolog.h
@@ -184,6 +184,8 @@ extern void trim_io_piece(struct thread_data *, const struct io_u *);
 extern void queue_io_piece(struct thread_data *, struct io_piece *);
 extern void prune_io_piece_log(struct thread_data *);
 extern void write_iolog_close(struct thread_data *);
+extern int iolog_compress_init(struct thread_data *);
+extern void iolog_compress_exit(struct thread_data *);
 
 #ifdef CONFIG_ZLIB
 extern int iolog_file_inflate(const char *);
diff --git a/lib/tp.c b/lib/tp.c
deleted file mode 100644 (file)
index 7462f5b..0000000
--- a/lib/tp.c
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * Basic workqueue like code, that sets up a thread and allows async
- * processing of some sort. Could be extended to allow for multiple
- * worker threads. But right now fio associates one of this per IO
- * thread, so should be enough to have just a single thread doing the
- * work.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <errno.h>
-#include <pthread.h>
-#include <string.h>
-
-#include "../smalloc.h"
-#include "../log.h"
-#include "tp.h"
-
-static void tp_flush_work(struct flist_head *list)
-{
-       struct tp_work *work;
-
-       while (!flist_empty(list)) {
-               int prio;
-
-               work = flist_entry(list->next, struct tp_work, list);
-               flist_del(&work->list);
-
-               prio = work->prio;
-               if (nice(prio) < 0)
-                       log_err("fio: nice %s\n", strerror(errno));
-
-               work->fn(work);
-
-               if (nice(prio) < 0)
-                       log_err("fio: nice %s\n", strerror(errno));
-       }
-}
-
-static void *tp_thread(void *data)
-{
-       struct tp_data *tdat = data;
-       struct flist_head work_list;
-
-       INIT_FLIST_HEAD(&work_list);
-
-       while (1) {
-               pthread_mutex_lock(&tdat->lock);
-
-               if (!tdat->thread_exit && flist_empty(&tdat->work))
-                       pthread_cond_wait(&tdat->cv, &tdat->lock);
-
-               if (!flist_empty(&tdat->work))
-                       flist_splice_tail_init(&tdat->work, &work_list);
-
-               pthread_mutex_unlock(&tdat->lock);
-
-               if (flist_empty(&work_list)) {
-                       if (tdat->thread_exit)
-                               break;
-                       continue;
-               }
-
-               tp_flush_work(&work_list);
-       }
-
-       return NULL;
-}
-
-void tp_queue_work(struct tp_data *tdat, struct tp_work *work)
-{
-       work->done = 0;
-
-       pthread_mutex_lock(&tdat->lock);
-       flist_add_tail(&work->list, &tdat->work);
-       pthread_mutex_unlock(&tdat->lock);
-
-       pthread_cond_signal(&tdat->cv);
-}
-
-void tp_init(struct tp_data **tdatp)
-{
-       struct tp_data *tdat;
-       int ret;
-
-       if (*tdatp)
-               return;
-
-       *tdatp = tdat = smalloc(sizeof(*tdat));
-       pthread_mutex_init(&tdat->lock, NULL);
-       INIT_FLIST_HEAD(&tdat->work);
-       pthread_cond_init(&tdat->cv, NULL);
-       pthread_cond_init(&tdat->sleep_cv, NULL);
-
-       ret = pthread_create(&tdat->thread, NULL, tp_thread, tdat);
-       if (ret)
-               log_err("fio: failed to create tp thread\n");
-}
-
-void tp_exit(struct tp_data **tdatp)
-{
-       struct tp_data *tdat = *tdatp;
-       void *ret;
-
-       if (!tdat)
-               return;
-
-       pthread_mutex_lock(&tdat->lock);
-       tdat->thread_exit = 1;
-       pthread_mutex_unlock(&tdat->lock);
-
-       pthread_cond_signal(&tdat->cv);
-
-       pthread_join(tdat->thread, &ret);
-
-       sfree(tdat);
-       *tdatp = NULL;
-}
diff --git a/lib/tp.h b/lib/tp.h
deleted file mode 100644 (file)
index 9147cc2..0000000
--- a/lib/tp.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef FIO_TP_H
-#define FIO_TP_H
-
-#include "../flist.h"
-
-struct tp_work;
-typedef int (tp_work_fn)(struct tp_work *);
-
-struct tp_work {
-       struct flist_head list;
-       tp_work_fn *fn;
-       int wait;
-       int prio;
-       pthread_cond_t cv;
-       pthread_mutex_t lock;
-       volatile int done;
-};
-
-struct tp_data {
-       pthread_t thread;
-       pthread_cond_t cv;
-       pthread_mutex_t lock;
-       struct flist_head work;
-       volatile int thread_exit;
-       pthread_cond_t sleep_cv;
-       volatile int sleeping;
-};
-
-extern void tp_init(struct tp_data **);
-extern void tp_exit(struct tp_data **);
-extern void tp_queue_work(struct tp_data *, struct tp_work *);
-
-#endif
index a68a3dd..a1d5591 100644 (file)
@@ -2,8 +2,8 @@
 #include "ioengine.h"
 #include "lib/getrusage.h"
 
-static void io_workqueue_fn(struct submit_worker *sw,
-                           struct workqueue_work *work)
+static int io_workqueue_fn(struct submit_worker *sw,
+                          struct workqueue_work *work)
 {
        struct io_u *io_u = container_of(work, struct io_u, work);
        const enum fio_ddir ddir = io_u->ddir;
@@ -48,6 +48,8 @@ static void io_workqueue_fn(struct submit_worker *sw,
                if (ret > 0)
                        td->cur_depth -= ret;
        }
+
+       return 0;
 }
 
 static bool io_workqueue_pre_sleep_flush_fn(struct submit_worker *sw)
index f732b30..69a8512 100644 (file)
@@ -19,7 +19,7 @@ struct submit_worker {
        void *private;
 };
 
-typedef void (workqueue_work_fn)(struct submit_worker *, struct workqueue_work *);
+typedef int (workqueue_work_fn)(struct submit_worker *, struct workqueue_work *);
 typedef bool (workqueue_pre_sleep_flush_fn)(struct submit_worker *);
 typedef void (workqueue_pre_sleep_fn)(struct submit_worker *);
 typedef int (workqueue_alloc_worker_fn)(struct submit_worker *);