From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Howard Chu <hyc@symas.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: mmap vs fs cache
Date: Fri, 8 Mar 2013 10:42:46 +0200 [thread overview]
Message-ID: <20130308084246.GA4411@shutemov.name> (raw)
In-Reply-To: <5139975F.9070509@symas.com>
On Thu, Mar 07, 2013 at 11:46:39PM -0800, Howard Chu wrote:
> You're misreading the information then. slapd is doing no caching of
> its own, its RSS and SHR memory size are both the same. All it is
> using is the mmap, nothing else. The RSS == SHR == FS cache, up to
> 16GB. RSS is always == SHR, but above 16GB they grow more slowly
> than the FS cache.
It only means, that some pages got unmapped from your process. It can
happned, for instance, due page migration. There's nothing worry about: it
will be mapped back on next page fault to the page and it's only minor
page fault since the page is in pagecache anyway.
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2013-03-08 8:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5136320E.8030109@symas.com>
2013-03-07 15:43 ` mmap vs fs cache Jan Kara
2013-03-08 2:08 ` Johannes Weiner
2013-03-08 7:46 ` Howard Chu
2013-03-08 8:42 ` Kirill A. Shutemov [this message]
2013-03-08 9:40 ` Howard Chu
2013-03-08 14:47 ` Chris Friesen
2013-03-08 15:00 ` Howard Chu
2013-03-08 15:25 ` Chris Friesen
2013-03-08 16:16 ` Johannes Weiner
2013-03-08 20:04 ` Howard Chu
2013-03-11 12:04 ` Jan Kara
2013-03-11 12:40 ` Howard Chu
2013-03-09 3:28 ` Ric Mason
2013-03-09 1:22 ` Phillip Susi
2013-03-11 11:52 ` Jan Kara
2013-03-11 15:03 ` Phillip Susi
2013-03-09 2:34 ` Ric Mason
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