Exceeding cache above cache.limit_in_bytes schedules high_work_func()
which tries to reclaim 32 pages. If cache generated fast enough or it allows
cgroup to steadily grow above cache.limit_in_bytes because we don't reclaim
enough. Try to reclaim exceeded amount of cache instead.
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
mm/memcontrol.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3cf200f506c3..e5adb0e81cbb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3080,12 +3080,16 @@ static void reclaim_high(struct mem_cgroup *memcg,
{
do {
+ unsigned long cache_overused;
+
if (page_counter_read(&memcg->memory) > memcg->high)
try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask,
0);
- if (page_counter_read(&memcg->cache) > memcg->cache.limit)
- try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask,
- MEM_CGROUP_RECLAIM_NOSWAP);
+ cache_overused = page_counter_read(&memcg->cache) -
+ memcg->cache.limit;
+ if (cache_overused)
+ try_to_free_mem_cgroup_pages(memcg, cache_overused,
+ gfp_mask, MEM_CGROUP_RECLAIM_NOSWAP);
} while ((memcg = parent_mem_cgroup(memcg)));
}
--
2.26.2
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