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f2fs: sysfs: introduce max_lock_elapsed_time

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This patch add a new sysfs node in /sys/fs/f2fs/<device>/max_lock_elapsed_time.

This is a threshold, once a thread enters critical region that lock covers,
total elapsed time exceeds this threshold, f2fs will print tracepoint to dump
information of related context. This sysfs entry can be used to control the
value of threshold, by default, the value is 500 ms.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2026-01-04 10:07:17 +08:00 committed by Jaegeuk Kim
parent 79b3cebc70
commit e4b75621fc
5 changed files with 15 additions and 1 deletions
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8
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -939,3 +939,11 @@ Description: Controls write priority in multi-devices setups. A value of 0 means
allocate_section_policy = 1 Prioritize writing to section before allocate_section_hint
allocate_section_policy = 2 Prioritize writing to section after allocate_section_hint
=========================== ==========================================================
What: /sys/fs/f2fs/<disk>/max_lock_elapsed_time
Date: December 2025
Contact: "Chao Yu" <chao@kernel.org>
Description: This is a threshold, once a thread enters critical region that lock covers, total
elapsed time exceeds this threshold, f2fs will print tracepoint to dump information
of related context. This sysfs entry can be used to control the value of threshold,
by default, the value is 500 ms.

2
fs/f2fs/checkpoint.c
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@ -66,7 +66,7 @@ static inline void trace_lock_elapsed_time_end(struct f2fs_rwsem *sem,
get_lock_elapsed_time(&tts);
total_time = div_u64(tts.total_time - lc->ts.total_time, npm);
if (total_time <= MAX_LOCK_ELAPSED_TIME)
if (total_time <= sem->sbi->max_lock_elapsed_time)
return;
#ifdef CONFIG_64BIT

3
fs/f2fs/f2fs.h
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@ -1951,6 +1951,9 @@ struct f2fs_sb_info {
/* carve out reserved_blocks from total blocks */
bool carve_out;
/* max elapsed time threshold in critical region that lock covered */
unsigned long long max_lock_elapsed_time;
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct kmem_cache *page_array_slab; /* page array entry */
unsigned int page_array_slab_size; /* default page array slab size */

1
fs/f2fs/super.c
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@ -4295,6 +4295,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
sbi->max_fragment_hole = DEF_FRAGMENT_SIZE;
spin_lock_init(&sbi->gc_remaining_trials_lock);
atomic64_set(&sbi->current_atomic_write, 0);
sbi->max_lock_elapsed_time = MAX_LOCK_ELAPSED_TIME;
sbi->dir_level = DEF_DIR_LEVEL;
sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;

2
fs/f2fs/sysfs.c
View File

@ -1219,6 +1219,7 @@ F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy);
F2FS_SBI_GENERAL_RW_ATTR(carve_out);
F2FS_SBI_GENERAL_RW_ATTR(reserved_pin_section);
F2FS_SBI_GENERAL_RW_ATTR(bggc_io_aware);
F2FS_SBI_GENERAL_RW_ATTR(max_lock_elapsed_time);
/* STAT_INFO ATTR */
#ifdef CONFIG_F2FS_STAT_FS
@ -1422,6 +1423,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(reserved_pin_section),
ATTR_LIST(allocate_section_hint),
ATTR_LIST(allocate_section_policy),
ATTR_LIST(max_lock_elapsed_time),
NULL,
};
ATTRIBUTE_GROUPS(f2fs);