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| author | Zhiguo Niu <zhiguo.niu@unisoc.com> | 2024-10-29 11:12:49 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-12-14 19:53:45 +0100 |
| commit | 07c0787286daa955f6c6f2c7fb7668f7d4f208b8 (patch) | |
| tree | 56b56ef88221393201ab534384da85455a9a98a6 /Documentation | |
| parent | b4751fc0db8cef8c139a85416f3858433fb1e779 (diff) | |
| download | linux-07c0787286daa955f6c6f2c7fb7668f7d4f208b8.tar.gz linux-07c0787286daa955f6c6f2c7fb7668f7d4f208b8.tar.bz2 linux-07c0787286daa955f6c6f2c7fb7668f7d4f208b8.zip | |
f2fs: fix to avoid use GC_AT when setting gc_mode as GC_URGENT_LOW or GC_URGENT_MID
[ Upstream commit 296b8cb34e65fa93382cf919be5a056f719c9a26 ]
If gc_mode is set to GC_URGENT_LOW or GC_URGENT_MID, cost benefit GC
approach should be used, but if ATGC is enabled at the same time,
Age-threshold approach will be selected, which can only do amount of
GC and it is much less than the numbers of CB approach.
some traces:
f2fs_gc-254:48-396 [007] ..... 2311600.684028: f2fs_gc_begin: dev = (254,48), gc_type = Background GC, no_background_GC = 0, nr_free_secs = 0, nodes = 1053, dents = 2, imeta = 18, free_sec:44898, free_seg:44898, rsv_seg:239, prefree_seg:0
f2fs_gc-254:48-396 [007] ..... 2311600.684527: f2fs_get_victim: dev = (254,48), type = No TYPE, policy = (Background GC, LFS-mode, Age-threshold), victim = 10, cost = 4294364975, ofs_unit = 1, pre_victim_secno = -1, prefree = 0, free = 44898
f2fs_gc-254:48-396 [007] ..... 2311600.714835: f2fs_gc_end: dev = (254,48), ret = 0, seg_freed = 0, sec_freed = 0, nodes = 1562, dents = 2, imeta = 18, free_sec:44898, free_seg:44898, rsv_seg:239, prefree_seg:0
f2fs_gc-254:48-396 [007] ..... 2311600.714843: f2fs_background_gc: dev = (254,48), wait_ms = 50, prefree = 0, free = 44898
f2fs_gc-254:48-396 [007] ..... 2311600.771785: f2fs_gc_begin: dev = (254,48), gc_type = Background GC, no_background_GC = 0, nr_free_secs = 0, nodes = 1562, dents = 2, imeta = 18, free_sec:44898, free_seg:44898, rsv_seg:239, prefree_seg:
f2fs_gc-254:48-396 [007] ..... 2311600.772275: f2fs_gc_end: dev = (254,48), ret = -61, seg_freed = 0, sec_freed = 0, nodes = 1562, dents = 2, imeta = 18, free_sec:44898, free_seg:44898, rsv_seg:239, prefree_seg:0
Fixes: 0e5e81114de1 ("f2fs: add GC_URGENT_LOW mode in gc_urgent")
Fixes: d98af5f45520 ("f2fs: introduce gc_urgent_mid mode")
Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-fs-f2fs | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 483639fb727b..a411ce2c7501 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -303,10 +303,13 @@ Description: Do background GC aggressively when set. Set to 0 by default. GC approach and turns SSR mode on. gc urgent low(2): lowers the bar of checking I/O idling in order to process outstanding discard commands and GC a - little bit aggressively. uses cost benefit GC approach. + little bit aggressively. always uses cost benefit GC approach, + and will override age-threshold GC approach if ATGC is enabled + at the same time. gc urgent mid(3): does GC forcibly in a period of given gc_urgent_sleep_time and executes a mid level of I/O idling check. - uses cost benefit GC approach. + always uses cost benefit GC approach, and will override + age-threshold GC approach if ATGC is enabled at the same time. What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time Date: August 2017 |