From: Chris Friesen <chris.friesen@genband.com>
To: Howard Chu <hyc@symas.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
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, 08 Mar 2013 09:25:48 -0600 [thread overview]
Message-ID: <513A02FC.4070208@genband.com> (raw)
In-Reply-To: <5139FD27.1030208@symas.com>
On 03/08/2013 09:00 AM, Howard Chu wrote:
> First obvious conclusion - kswapd is being too aggressive. When free
> memory hits the low watermark, the reclaim shrinks slapd down from 25GB
> to 18-19GB, while the page cache still contains ~7GB of unmapped pages.
> Ideally I'd like a tuning knob so I can say to keep no more than 2GB of
> unmapped pages in the cache. (And the desired effect of that would be to
> allow user processes to grow to 30GB total, in this case.)
>
> I mentioned this "unmapped page cache control" post already
> http://lwn.net/Articles/436010/ but it seems that the idea was
> ultimately rejected. Is there anything else similar in current kernels?
Sorry, I'm not aware of anything. I'm not a filesystem/vm guy though,
so maybe there's something I don't know about.
I would have expected both posix_madvise(..POSIX_MADV_RANDOM) and
swappiness to help, but it doesn't sound like they're working.
Chris
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next prev parent reply other threads:[~2013-03-08 15:26 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 ` Jan Kara
2013-03-08 2:08 ` Johannes Weiner
2013-03-08 7:46 ` Howard Chu
2013-03-08 8:42 ` Kirill A. Shutemov
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 [this message]
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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