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writeback: update writeback tracepoints to report cgroup

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The following tracepoints are updated to report the cgroup used during
cgroup writeback.

* writeback_write_inode[_start]
* writeback_queue
* writeback_exec
* writeback_start
* writeback_written
* writeback_wait
* writeback_nowork
* writeback_wake_background
* wbc_writepage
* writeback_queue_io
* bdi_dirty_ratelimit
* balance_dirty_pages
* writeback_sb_inodes_requeue
* writeback_single_inode[_start]

Note that writeback_bdi_register is separated out from writeback_class
as reporting cgroup doesn't make sense to it.  Tracepoints which take
bdi are updated to take bdi_writeback instead.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2015-08-18 14:54:56 -07:00 committed by Jens Axboe
parent 9acee9c551
commit 5634cc2aa9
3 changed files with 152 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/fs-writeback.c
View File

@ -176,7 +176,7 @@ static void wb_wakeup(struct bdi_writeback *wb)
static void wb_queue_work(struct bdi_writeback *wb,
struct wb_writeback_work *work)
{
trace_writeback_queue(wb->bdi, work);
trace_writeback_queue(wb, work);
spin_lock_bh(&wb->work_lock);
if (!test_bit(WB_registered, &wb->state))
@ -883,7 +883,7 @@ void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
*/
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
trace_writeback_nowork(wb->bdi);
trace_writeback_nowork(wb);
wb_wakeup(wb);
return;
}
@ -913,7 +913,7 @@ void wb_start_background_writeback(struct bdi_writeback *wb)
* We just wake up the flusher thread. It will perform background
* writeback as soon as there is no other work to do.
*/
trace_writeback_wake_background(wb->bdi);
trace_writeback_wake_background(wb);
wb_wakeup(wb);
}
@ -1616,14 +1616,14 @@ static long wb_writeback(struct bdi_writeback *wb,
} else if (work->for_background)
oldest_jif = jiffies;
trace_writeback_start(wb->bdi, work);
trace_writeback_start(wb, work);
if (list_empty(&wb->b_io))
queue_io(wb, work);
if (work->sb)
progress = writeback_sb_inodes(work->sb, wb, work);
else
progress = __writeback_inodes_wb(wb, work);
trace_writeback_written(wb->bdi, work);
trace_writeback_written(wb, work);
wb_update_bandwidth(wb, wb_start);
@ -1648,7 +1648,7 @@ static long wb_writeback(struct bdi_writeback *wb,
* we'll just busyloop.
*/
if (!list_empty(&wb->b_more_io)) {
trace_writeback_wait(wb->bdi, work);
trace_writeback_wait(wb, work);
inode = wb_inode(wb->b_more_io.prev);
spin_lock(&inode->i_lock);
spin_unlock(&wb->list_lock);
@ -1754,7 +1754,7 @@ static long wb_do_writeback(struct bdi_writeback *wb)
while ((work = get_next_work_item(wb)) != NULL) {
struct wb_completion *done = work->done;
trace_writeback_exec(wb->bdi, work);
trace_writeback_exec(wb, work);
wrote += wb_writeback(wb, work);

182
include/trace/events/writeback.h
View File

@ -131,6 +131,66 @@ DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
TP_ARGS(inode, flags)
);
#ifdef CREATE_TRACE_POINTS
#ifdef CONFIG_CGROUP_WRITEBACK
static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
{
return kernfs_path_len(wb->memcg_css->cgroup->kn) + 1;
}
static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
{
struct cgroup *cgrp = wb->memcg_css->cgroup;
char *path;
path = cgroup_path(cgrp, buf, kernfs_path_len(cgrp->kn) + 1);
WARN_ON_ONCE(path != buf);
}
static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
{
if (wbc->wb)
return __trace_wb_cgroup_size(wbc->wb);
else
return 2;
}
static inline void __trace_wbc_assign_cgroup(char *buf,
struct writeback_control *wbc)
{
if (wbc->wb)
__trace_wb_assign_cgroup(buf, wbc->wb);
else
strcpy(buf, "/");
}
#else /* CONFIG_CGROUP_WRITEBACK */
static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
{
return 2;
}
static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
{
strcpy(buf, "/");
}
static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
{
return 2;
}
static inline void __trace_wbc_assign_cgroup(char *buf,
struct writeback_control *wbc)
{
strcpy(buf, "/");
}
#endif /* CONFIG_CGROUP_WRITEBACK */
#endif /* CREATE_TRACE_POINTS */
DECLARE_EVENT_CLASS(writeback_write_inode_template,
TP_PROTO(struct inode *inode, struct writeback_control *wbc),
@ -141,6 +201,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
__array(char, name, 32)
__field(unsigned long, ino)
__field(int, sync_mode)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
),
TP_fast_assign(
@ -148,12 +209,14 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
dev_name(inode_to_bdi(inode)->dev), 32);
__entry->ino = inode->i_ino;
__entry->sync_mode = wbc->sync_mode;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
),
TP_printk("bdi %s: ino=%lu sync_mode=%d",
TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup=%s",
__entry->name,
__entry->ino,
__entry->sync_mode
__entry->sync_mode,
__get_str(cgroup)
)
);
@ -172,8 +235,8 @@ DEFINE_EVENT(writeback_write_inode_template, writeback_write_inode,
);
DECLARE_EVENT_CLASS(writeback_work_class,
TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
TP_ARGS(bdi, work),
TP_PROTO(struct bdi_writeback *wb, struct wb_writeback_work *work),
TP_ARGS(wb, work),
TP_STRUCT__entry(
__array(char, name, 32)
__field(long, nr_pages)
@ -183,10 +246,11 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__field(int, range_cyclic)
__field(int, for_background)
__field(int, reason)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
),
TP_fast_assign(
strncpy(__entry->name,
bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32);
wb->bdi->dev ? dev_name(wb->bdi->dev) : "(unknown)", 32);
__entry->nr_pages = work->nr_pages;
__entry->sb_dev = work->sb ? work->sb->s_dev : 0;
__entry->sync_mode = work->sync_mode;
@ -194,9 +258,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__entry->range_cyclic = work->range_cyclic;
__entry->for_background = work->for_background;
__entry->reason = work->reason;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
),
TP_printk("bdi %s: sb_dev %d:%d nr_pages=%ld sync_mode=%d "
"kupdate=%d range_cyclic=%d background=%d reason=%s",
"kupdate=%d range_cyclic=%d background=%d reason=%s cgroup=%s",
__entry->name,
MAJOR(__entry->sb_dev), MINOR(__entry->sb_dev),
__entry->nr_pages,
@ -204,13 +269,14 @@ DECLARE_EVENT_CLASS(writeback_work_class,
__entry->for_kupdate,
__entry->range_cyclic,
__entry->for_background,
__print_symbolic(__entry->reason, WB_WORK_REASON)
__print_symbolic(__entry->reason, WB_WORK_REASON),
__get_str(cgroup)
)
);
#define DEFINE_WRITEBACK_WORK_EVENT(name) \
DEFINE_EVENT(writeback_work_class, name, \
TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work), \
TP_ARGS(bdi, work))
TP_PROTO(struct bdi_writeback *wb, struct wb_writeback_work *work), \
TP_ARGS(wb, work))
DEFINE_WRITEBACK_WORK_EVENT(writeback_queue);
DEFINE_WRITEBACK_WORK_EVENT(writeback_exec);
DEFINE_WRITEBACK_WORK_EVENT(writeback_start);
@ -230,6 +296,30 @@ TRACE_EVENT(writeback_pages_written,
);
DECLARE_EVENT_CLASS(writeback_class,
TP_PROTO(struct bdi_writeback *wb),
TP_ARGS(wb),
TP_STRUCT__entry(
__array(char, name, 32)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
),
TP_fast_assign(
strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
),
TP_printk("bdi %s: cgroup=%s",
__entry->name,
__get_str(cgroup)
)
);
#define DEFINE_WRITEBACK_EVENT(name) \
DEFINE_EVENT(writeback_class, name, \
TP_PROTO(struct bdi_writeback *wb), \
TP_ARGS(wb))
DEFINE_WRITEBACK_EVENT(writeback_nowork);
DEFINE_WRITEBACK_EVENT(writeback_wake_background);
TRACE_EVENT(writeback_bdi_register,
TP_PROTO(struct backing_dev_info *bdi),
TP_ARGS(bdi),
TP_STRUCT__entry(
@ -239,17 +329,9 @@ DECLARE_EVENT_CLASS(writeback_class,
strncpy(__entry->name, dev_name(bdi->dev), 32);
),
TP_printk("bdi %s",
__entry->name
__entry->name
)
);
#define DEFINE_WRITEBACK_EVENT(name) \
DEFINE_EVENT(writeback_class, name, \
TP_PROTO(struct backing_dev_info *bdi), \
TP_ARGS(bdi))
DEFINE_WRITEBACK_EVENT(writeback_nowork);
DEFINE_WRITEBACK_EVENT(writeback_wake_background);
DEFINE_WRITEBACK_EVENT(writeback_bdi_register);
DECLARE_EVENT_CLASS(wbc_class,
TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi),
@ -265,6 +347,7 @@ DECLARE_EVENT_CLASS(wbc_class,
__field(int, range_cyclic)
__field(long, range_start)
__field(long, range_end)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
),
TP_fast_assign(
@ -278,11 +361,12 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->range_cyclic = wbc->range_cyclic;
__entry->range_start = (long)wbc->range_start;
__entry->range_end = (long)wbc->range_end;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
),
TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
"bgrd=%d reclm=%d cyclic=%d "
"start=0x%lx end=0x%lx",
"start=0x%lx end=0x%lx cgroup=%s",
__entry->name,
__entry->nr_to_write,
__entry->pages_skipped,
@ -292,7 +376,9 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->for_reclaim,
__entry->range_cyclic,
__entry->range_start,
__entry->range_end)
__entry->range_end,
__get_str(cgroup)
)
)
#define DEFINE_WBC_EVENT(name) \
@ -312,6 +398,7 @@ TRACE_EVENT(writeback_queue_io,
__field(long, age)
__field(int, moved)
__field(int, reason)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
),
TP_fast_assign(
unsigned long *older_than_this = work->older_than_this;
@ -321,13 +408,15 @@ TRACE_EVENT(writeback_queue_io,
(jiffies - *older_than_this) * 1000 / HZ : -1;
__entry->moved = moved;
__entry->reason = work->reason;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
),
TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s",
TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup=%s",
__entry->name,
__entry->older, /* older_than_this in jiffies */
__entry->age, /* older_than_this in relative milliseconds */
__entry->moved,
__print_symbolic(__entry->reason, WB_WORK_REASON)
__print_symbolic(__entry->reason, WB_WORK_REASON),
__get_str(cgroup)
)
);
@ -381,11 +470,11 @@ TRACE_EVENT(global_dirty_state,
TRACE_EVENT(bdi_dirty_ratelimit,
TP_PROTO(struct backing_dev_info *bdi,
TP_PROTO(struct bdi_writeback *wb,
unsigned long dirty_rate,
unsigned long task_ratelimit),
TP_ARGS(bdi, dirty_rate, task_ratelimit),
TP_ARGS(wb, dirty_rate, task_ratelimit),
TP_STRUCT__entry(
__array(char, bdi, 32)
@ -395,36 +484,39 @@ TRACE_EVENT(bdi_dirty_ratelimit,
__field(unsigned long, dirty_ratelimit)
__field(unsigned long, task_ratelimit)
__field(unsigned long, balanced_dirty_ratelimit)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
),
TP_fast_assign(
strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
__entry->write_bw = KBps(bdi->wb.write_bandwidth);
__entry->avg_write_bw = KBps(bdi->wb.avg_write_bandwidth);
strlcpy(__entry->bdi, dev_name(wb->bdi->dev), 32);
__entry->write_bw = KBps(wb->write_bandwidth);
__entry->avg_write_bw = KBps(wb->avg_write_bandwidth);
__entry->dirty_rate = KBps(dirty_rate);
__entry->dirty_ratelimit = KBps(bdi->wb.dirty_ratelimit);
__entry->dirty_ratelimit = KBps(wb->dirty_ratelimit);
__entry->task_ratelimit = KBps(task_ratelimit);
__entry->balanced_dirty_ratelimit =
KBps(bdi->wb.balanced_dirty_ratelimit);
KBps(wb->balanced_dirty_ratelimit);
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
),
TP_printk("bdi %s: "
"write_bw=%lu awrite_bw=%lu dirty_rate=%lu "
"dirty_ratelimit=%lu task_ratelimit=%lu "
"balanced_dirty_ratelimit=%lu",
"balanced_dirty_ratelimit=%lu cgroup=%s",
__entry->bdi,
__entry->write_bw, /* write bandwidth */
__entry->avg_write_bw, /* avg write bandwidth */
__entry->dirty_rate, /* bdi dirty rate */
__entry->dirty_ratelimit, /* base ratelimit */
__entry->task_ratelimit, /* ratelimit with position control */
__entry->balanced_dirty_ratelimit /* the balanced ratelimit */
__entry->balanced_dirty_ratelimit, /* the balanced ratelimit */
__get_str(cgroup)
)
);
TRACE_EVENT(balance_dirty_pages,
TP_PROTO(struct backing_dev_info *bdi,
TP_PROTO(struct bdi_writeback *wb,
unsigned long thresh,
unsigned long bg_thresh,
unsigned long dirty,
@ -437,7 +529,7 @@ TRACE_EVENT(balance_dirty_pages,
long pause,
unsigned long start_time),
TP_ARGS(bdi, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,
TP_ARGS(wb, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,
dirty_ratelimit, task_ratelimit,
dirtied, period, pause, start_time),
@ -456,11 +548,12 @@ TRACE_EVENT(balance_dirty_pages,
__field( long, pause)
__field(unsigned long, period)
__field( long, think)
__dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
),
TP_fast_assign(
unsigned long freerun = (thresh + bg_thresh) / 2;
strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
strlcpy(__entry->bdi, dev_name(wb->bdi->dev), 32);
__entry->limit = global_wb_domain.dirty_limit;
__entry->setpoint = (global_wb_domain.dirty_limit +
@ -478,6 +571,7 @@ TRACE_EVENT(balance_dirty_pages,
__entry->period = period * 1000 / HZ;
__entry->pause = pause * 1000 / HZ;
__entry->paused = (jiffies - start_time) * 1000 / HZ;
__trace_wb_assign_cgroup(__get_str(cgroup), wb);
),
@ -486,7 +580,7 @@ TRACE_EVENT(balance_dirty_pages,
"bdi_setpoint=%lu bdi_dirty=%lu "
"dirty_ratelimit=%lu task_ratelimit=%lu "
"dirtied=%u dirtied_pause=%u "
"paused=%lu pause=%ld period=%lu think=%ld",
"paused=%lu pause=%ld period=%lu think=%ld cgroup=%s",
__entry->bdi,
__entry->limit,
__entry->setpoint,
@ -500,7 +594,8 @@ TRACE_EVENT(balance_dirty_pages,
__entry->paused, /* ms */
__entry->pause, /* ms */
__entry->period, /* ms */
__entry->think /* ms */
__entry->think, /* ms */
__get_str(cgroup)
)
);
@ -514,6 +609,8 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
__field(unsigned long, ino)
__field(unsigned long, state)
__field(unsigned long, dirtied_when)
__dynamic_array(char, cgroup,
__trace_wb_cgroup_size(inode_to_wb(inode)))
),
TP_fast_assign(
@ -522,14 +619,16 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
__entry->ino = inode->i_ino;
__entry->state = inode->i_state;
__entry->dirtied_when = inode->dirtied_when;
__trace_wb_assign_cgroup(__get_str(cgroup), inode_to_wb(inode));
),
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu",
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup=%s",
__entry->name,
__entry->ino,
show_inode_state(__entry->state),
__entry->dirtied_when,
(jiffies - __entry->dirtied_when) / HZ
(jiffies - __entry->dirtied_when) / HZ,
__get_str(cgroup)
)
);
@ -585,6 +684,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
__field(unsigned long, writeback_index)
__field(long, nr_to_write)
__field(unsigned long, wrote)
__dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
),
TP_fast_assign(
@ -596,10 +696,11 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
__entry->writeback_index = inode->i_mapping->writeback_index;
__entry->nr_to_write = nr_to_write;
__entry->wrote = nr_to_write - wbc->nr_to_write;
__trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
),
TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu "
"index=%lu to_write=%ld wrote=%lu",
"index=%lu to_write=%ld wrote=%lu cgroup=%s",
__entry->name,
__entry->ino,
show_inode_state(__entry->state),
@ -607,7 +708,8 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
(jiffies - __entry->dirtied_when) / HZ,
__entry->writeback_index,
__entry->nr_to_write,
__entry->wrote
__entry->wrote,
__get_str(cgroup)
)
);

6
mm/page-writeback.c
View File

@ -1289,7 +1289,7 @@ static void wb_update_dirty_ratelimit(struct dirty_throttle_control *dtc,
wb->dirty_ratelimit = max(dirty_ratelimit, 1UL);
wb->balanced_dirty_ratelimit = balanced_dirty_ratelimit;
trace_bdi_dirty_ratelimit(wb->bdi, dirty_rate, task_ratelimit);
trace_bdi_dirty_ratelimit(wb, dirty_rate, task_ratelimit);
}
static void __wb_update_bandwidth(struct dirty_throttle_control *gdtc,
@ -1683,7 +1683,7 @@ static void balance_dirty_pages(struct address_space *mapping,
* do a reset, as it may be a light dirtier.
*/
if (pause < min_pause) {
trace_balance_dirty_pages(bdi,
trace_balance_dirty_pages(wb,
sdtc->thresh,
sdtc->bg_thresh,
sdtc->dirty,
@ -1712,7 +1712,7 @@ static void balance_dirty_pages(struct address_space *mapping,
}
pause:
trace_balance_dirty_pages(bdi,
trace_balance_dirty_pages(wb,
sdtc->thresh,
sdtc->bg_thresh,
sdtc->dirty,