From: Minchan Kim <minchan@kernel.org>
To: Vinayak Menon <vinmenon@codeaurora.org>
Cc: <akpm@linux-foundation.org>, <hannes@cmpxchg.org>,
<mgorman@techsingularity.net>, <vbabka@suse.cz>,
<mhocko@suse.com>, <riel@redhat.com>, <vdavydov.dev@gmail.com>,
<anton.vorontsov@linaro.org>, <shashim@codeaurora.org>,
<linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2 v3] mm: vmscan: do not pass reclaimed slab to vmpressure
Date: Wed, 1 Feb 2017 15:12:48 +0900 [thread overview]
Message-ID: <20170201061248.GA9690@bbox> (raw)
In-Reply-To: <1485853328-7672-1-git-send-email-vinmenon@codeaurora.org>
On Tue, Jan 31, 2017 at 02:32:08PM +0530, Vinayak Menon wrote:
> During global reclaim, the nr_reclaimed passed to vmpressure
> includes the pages reclaimed from slab. But the corresponding
> scanned slab pages is not passed. This can cause total reclaimed
> pages to be greater than scanned, causing an unsigned underflow
> in vmpressure resulting in a critical event being sent to root
> cgroup. So do not consider reclaimed slab pages for vmpressure
> calculation. The reclaimed pages from slab can be excluded because
> the freeing of a page by slab shrinking depends on each slab's
> object population, making the cost model (i.e. scan:free) different
> from that of LRU. Also, not every shrinker accounts the pages it
> reclaims. This is a regression introduced by commit 6b4f7799c6a5
> ("mm: vmscan: invoke slab shrinkers from shrink_zone()").
>
> Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Acked-by: Minchan Kim <minchan@kernel.org>
next prev parent reply other threads:[~2017-02-01 6:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-27 8:13 [PATCH 1/2 v2] mm: vmscan: do not pass reclaimed slab to vmpressure Vinayak Menon
2017-01-27 8:13 ` [PATCH 2/2] mm: vmpressure: fix sending wrong events on underflow Vinayak Menon
2017-01-30 23:58 ` Minchan Kim
2017-01-30 23:56 ` [PATCH 1/2 v2] mm: vmscan: do not pass reclaimed slab to vmpressure Minchan Kim
2017-01-31 7:48 ` vinayak menon
2017-01-31 9:02 ` [PATCH 1/2 v3] " Vinayak Menon
2017-02-01 6:12 ` Minchan Kim [this message]
2017-02-02 10:44 ` Michal Hocko
2017-02-02 10:48 ` Michal Hocko
2017-02-02 11:25 ` vinayak menon
2017-02-02 11:52 ` Michal Hocko
2017-02-02 15:30 ` vinayak menon
2017-02-02 16:01 ` Michal Hocko
2017-02-03 5:26 ` vinayak menon
2017-02-03 14:59 ` Michal Hocko
2017-02-06 11:31 ` vinayak menon
2017-02-02 11:28 ` vinayak menon
2017-02-03 6:17 ` Minchan Kim
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