linux-kernel - Re: Memory management issue in 4.18.15

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Message-ID: <a655c898-0701-f10d-bbf3-8a0090544560@infradead.org>
Date:   Sat, 20 Oct 2018 08:37:28 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Spock <dairinin@...il.com>, linux-kernel@...r.kernel.org,
        Linux MM <linux-mm@...ck.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: Memory management issue in 4.18.15

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On 10/20/18 4:41 AM, Spock wrote:
> Hello,
> 
> I have a workload, which creates lots of cache pages. Before 4.18.15,
> the behavior was very stable: pagecache is constantly growing until it
> consumes all the free memory, and then kswapd is balancing it around
> low watermark. After 4.18.15, once in a while khugepaged is waking up
> and reclaims almost all the pages from pagecache, so there is always
> around 2G of 8G unused. THP is enabled only for madvise case and are
> not used.
> 
> The exact change that leads to current behavior is
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.18.y&id=62aad93f09c1952ede86405894df1b22012fd5ab
> 


-- 
~Randy