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authorJaegeuk Kim <jaegeuk@kernel.org>2016-11-14 17:38:35 -0800
committerJaegeuk Kim <jaegeuk@kernel.org>2016-11-25 10:15:57 -0800
commit7702bdbe505a22380dd958e2ee35124c7c414806 (patch)
tree8dc084fff9df8d1330389b877514977b7eb97ecf /fs/f2fs/gc.c
parentc040ff9d69fd1d782fe577ba9e35c1f5798158ae (diff)
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f2fs: avoid BG_GC in f2fs_balance_fs
If many threads hit has_not_enough_free_secs() in f2fs_balance_fs() at the same time, all the threads would do FG_GC or BG_GC. In this critical path, we totally don't need to do BG_GC at all. Let's avoid that. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/gc.c')
-rw-r--r--fs/f2fs/gc.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index a7b2c13404f8..36f6cfc613d3 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -82,7 +82,7 @@ static int gc_thread_func(void *data)
stat_inc_bggc_count(sbi);
/* if return value is not zero, no victim was selected */
- if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC)))
+ if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC), true))
wait_ms = gc_th->no_gc_sleep_time;
trace_f2fs_background_gc(sbi->sb, wait_ms,
@@ -909,7 +909,7 @@ next:
return sec_freed;
}
-int f2fs_gc(struct f2fs_sb_info *sbi, bool sync)
+int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background)
{
unsigned int segno;
int gc_type = sync ? FG_GC : BG_GC;
@@ -950,6 +950,9 @@ gc_more:
if (ret)
goto stop;
}
+ } else if (gc_type == BG_GC && !background) {
+ /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
+ goto stop;
}
if (segno == NULL_SEGNO && !__get_victim(sbi, &segno, gc_type))