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f2fs: introduce trace_f2fs_priority_update

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This patch introduces two new tracepoints for debug purpose.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2026-01-30 21:28:09 +08:00 committed by Jaegeuk Kim
parent 07de55cbf5
commit bc367775f6
2 changed files with 69 additions and 5 deletions
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17
fs/f2fs/checkpoint.c
View File

@ -130,9 +130,13 @@ static void uplift_priority(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc
return;
set_user_nice(current, lc->new_nice);
lc->need_restore = true;
trace_f2fs_priority_uplift(sem->sbi, sem->name, is_write, current,
NICE_TO_PRIO(lc->orig_nice), NICE_TO_PRIO(lc->new_nice));
}
static void restore_priority(struct f2fs_lock_context *lc)
static void restore_priority(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc,
bool is_write)
{
if (!lc->need_restore)
return;
@ -140,6 +144,9 @@ static void restore_priority(struct f2fs_lock_context *lc)
if (task_nice(current) != lc->new_nice)
return;
set_user_nice(current, lc->orig_nice);
trace_f2fs_priority_restore(sem->sbi, sem->name, is_write, current,
NICE_TO_PRIO(lc->orig_nice), NICE_TO_PRIO(lc->new_nice));
}
void f2fs_down_read_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc)
@ -153,7 +160,7 @@ int f2fs_down_read_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_contex
{
uplift_priority(sem, lc, false);
if (!f2fs_down_read_trylock(sem)) {
restore_priority(lc);
restore_priority(sem, lc, false);
return 0;
}
trace_lock_elapsed_time_start(sem, lc);
@ -163,7 +170,7 @@ int f2fs_down_read_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_contex
void f2fs_up_read_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc)
{
f2fs_up_read(sem);
restore_priority(lc);
restore_priority(sem, lc, false);
trace_lock_elapsed_time_end(sem, lc, false);
}
@ -178,7 +185,7 @@ int f2fs_down_write_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_conte
{
uplift_priority(sem, lc, true);
if (!f2fs_down_write_trylock(sem)) {
restore_priority(lc);
restore_priority(sem, lc, true);
return 0;
}
trace_lock_elapsed_time_start(sem, lc);
@ -188,7 +195,7 @@ int f2fs_down_write_trylock_trace(struct f2fs_rwsem *sem, struct f2fs_lock_conte
void f2fs_up_write_trace(struct f2fs_rwsem *sem, struct f2fs_lock_context *lc)
{
f2fs_up_write(sem);
restore_priority(lc);
restore_priority(sem, lc, true);
trace_lock_elapsed_time_end(sem, lc, true);
}

57
include/trace/events/f2fs.h
View File

@ -2525,6 +2525,63 @@ TRACE_EVENT(f2fs_lock_elapsed_time,
__entry->other_time)
);
DECLARE_EVENT_CLASS(f2fs_priority_update,
TP_PROTO(struct f2fs_sb_info *sbi, enum f2fs_lock_name lock_name,
bool is_write, struct task_struct *p, int orig_prio,
int new_prio),
TP_ARGS(sbi, lock_name, is_write, p, orig_prio, new_prio),
TP_STRUCT__entry(
__field(dev_t, dev)
__array(char, comm, TASK_COMM_LEN)
__field(pid_t, pid)
__field(unsigned int, lock_name)
__field(bool, is_write)
__field(int, orig_prio)
__field(int, new_prio)
),
TP_fast_assign(
__entry->dev = sbi->sb->s_dev;
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->pid = p->pid;
__entry->lock_name = lock_name;
__entry->is_write = is_write;
__entry->orig_prio = orig_prio;
__entry->new_prio = new_prio;
),
TP_printk("dev = (%d,%d), comm: %s, pid: %d, lock_name: %s, "
"lock_type: %s, orig_prio: %d, new_prio: %d",
show_dev(__entry->dev),
__entry->comm,
__entry->pid,
show_lock_name(__entry->lock_name),
__entry->is_write ? "wlock" : "rlock",
__entry->orig_prio,
__entry->new_prio)
);
DEFINE_EVENT(f2fs_priority_update, f2fs_priority_uplift,
TP_PROTO(struct f2fs_sb_info *sbi, enum f2fs_lock_name lock_name,
bool is_write, struct task_struct *p, int orig_prio,
int new_prio),
TP_ARGS(sbi, lock_name, is_write, p, orig_prio, new_prio)
);
DEFINE_EVENT(f2fs_priority_update, f2fs_priority_restore,
TP_PROTO(struct f2fs_sb_info *sbi, enum f2fs_lock_name lock_name,
bool is_write, struct task_struct *p, int orig_prio,
int new_prio),
TP_ARGS(sbi, lock_name, is_write, p, orig_prio, new_prio)
);
#endif /* _TRACE_F2FS_H */
/* This part must be outside protection */