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mm: vmscan: add more comments about cache_trim_mode

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Add more comments for cache_trim_mode, and the annotations provided by
Johannes Weiner in [1].

Link: https://lore.kernel.org/all/20250314141833.GA1316033@cmpxchg.org/
Link: https://lkml.kernel.org/r/4baad87ba637f1e6f666e9b99b3fdcb7ab39171b.1745225696.git.hezhongkun.hzk@bytedance.com
Signed-off-by: Zhongkun He <hezhongkun.hzk@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zhongkun He 2025-04-21 17:13:29 +08:00 committed by Andrew Morton
parent 68a1436bde
commit aded729f64
1 changed files with 2 additions and 1 deletions
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3
mm/vmscan.c
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@ -2536,7 +2536,8 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
/*
* If there is enough inactive page cache, we do not reclaim
* anything from the anonymous working right now.
* anything from the anonymous working right now to make sure
* a streaming file access pattern doesn't cause swapping.
*/
if (sc->cache_trim_mode) {
scan_balance = SCAN_FILE;