linux-kernel - Re: [PATCH 1/7] mm: memcontrol: charge swap to cgroup2

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Date:	Thu, 17 Dec 2015 11:46:27 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Michal Hocko <mhocko@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] mm: memcontrol: charge swap to cgroup2

On 2015/12/16 20:09, Johannes Weiner wrote:
> On Wed, Dec 16, 2015 at 12:18:30PM +0900, Kamezawa Hiroyuki wrote:
>> Hmm, my requests are
>>   - set the same capabilities as mlock() to set swap.limit=0
>
> Setting swap.max is already privileged operation.
>
Sure.

>>   - swap-full notification via vmpressure or something mechanism.
>
> Why?
>

I think it's a sign of unhealthy condition, starting file cache drop rate to rise.
But I forgot that there are resource threshold notifier already. Does the notifier work
for swap.usage ?

>>   - OOM-Killer's available memory calculation may be corrupted, please check.
>
> Vladimir updated mem_cgroup_get_limit().
>
I'll check it.

>>   - force swap-in at reducing swap.limit
>
> Why?
>
If full, swap.limit cannot be reduced even if there are available memory in a cgroup.
Another cgroup cannot make use of the swap resource while it's occupied by other cgroup.
The job scheduler should have a chance to fix the situation.

Thanks,
-Kame

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