linux-kernel - Re: Sudden and massive page cache eviction

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Message-ID: <AANLkTi=mgTHPEYFsryDYnxPa78f-Nr+H7i4+0KPZbxh3@mail.gmail.com>
Date:	Wed, 24 Nov 2010 15:14:46 +0100
From:	Peter Schüller <scode@...tify.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Mattias de Zalenski <zalenski@...tify.com>,
	linux-mm@...ck.org
Subject: Re: Sudden and massive page cache eviction

>> Do you have any large page (hugetlbfs) or other multi-order (> 1 page)
>> allocations happening in the kernel?

I forgot to address the second part of this question: How would I best
inspect whether the kernel is doing that?

Looking at the kmalloc() sizes from vmstat -m I have the following on
one of the machines (so very few larger than 4096). But I suspect you
are asking for something different?

kmalloc-8192                 52     56   8192      4
kmalloc-4096              33927  62040   4096      8
kmalloc-2048                338    416   2048     16
kmalloc-1024              76211 246976   1024     32
kmalloc-512                1134   1216    512     32
kmalloc-256              109523 324928    256     32
kmalloc-128                3902   4288    128     32
kmalloc-64               105296 105536     64     64
kmalloc-32                 2120   2176     32    128
kmalloc-16                 4607   4608     16    256
kmalloc-8                  6655   6656      8    512
kmalloc-192                6546   9030    192     21
kmalloc-96                29694  32298     96     42

-- 
/ Peter Schuller aka scode
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