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| author | Johannes Weiner <hannes@cmpxchg.org> | 2020-08-06 23:22:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-07 11:33:26 -0700 |
| commit | 19ce33acbbd03c371f2d4b533879c4755686f95f (patch) | |
| tree | 5d92aa74bbce27717edea2da2578dc14e300d2fe /mm/memcontrol.c | |
| parent | 1378b37d03e8147c67fde60caf0474ea879163d8 (diff) | |
| download | linux-19ce33acbbd03c371f2d4b533879c4755686f95f.tar.bz2 | |
mm: memcontrol: restore proper dirty throttling when memory.high changes
Commit 8c8c383c04f6 ("mm: memcontrol: try harder to set a new
memory.high") inadvertently removed a callback to recalculate the
writeback cache size in light of a newly configured memory.high limit.
Without letting the writeback cache know about a potentially heavily
reduced limit, it may permit too many dirty pages, which can cause
unnecessary reclaim latencies or even avoidable OOM situations.
This was spotted while reading the code, it hasn't knowingly caused any
problems in practice so far.
Fixes: 8c8c383c04f6 ("mm: memcontrol: try harder to set a new memory.high")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Chris Down <chris@chrisdown.name>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <guro@fb.com>
Link: http://lkml.kernel.org/r/20200728135210.379885-1-hannes@cmpxchg.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 369d9e1d8333..856db3ba3093 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6273,6 +6273,8 @@ static ssize_t memory_high_write(struct kernfs_open_file *of, page_counter_set_high(&memcg->memory, high); + memcg_wb_domain_size_changed(memcg); + return nbytes; } |