On 7/30/20 6:57 PM, Evgenii Shatokhin wrote:
> On 30.07.2020 17:00, Denis V. Lunev wrote:
>> On 7/30/20 4:58 PM, Andrey Ryabinin wrote:
>>> 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.
>>>
>>> https://jira.sw.ru/browse/PSBM-106384
>>> Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
>>> ---
>>>
>>> Changes since v1: add bug link to changelog
>>>
>>> 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)));
>>> }
>> can we run some testing and after that create custom RK to make check
>> with
>> HostEurope on Monday?
>
> 1. Which kernel version(s)?
151.14
>
> 2. Would it be enough to prepare the live patch as .ko file and load
> it manually ('kpatch load') or RPM package is preferable?
>
sure
> If you plan to use the fix on more than one node, I think, an RPM
> package is easier to use. For a single node, *.ko file would be enough.
>
one node - for test purposes
Den
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