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

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Message-ID: <AANLkTimo1BR=mSJ6wPQwrL4FDNv=_TfanPPTT7uWx7hQ@mail.gmail.com>
Date:	Wed, 24 Nov 2010 16:20:30 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Peter Schüller <scode@...tify.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	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

Hi Peter,

2010/11/24 Peter Schüller <scode@...tify.com>:
>>> 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?

You can, for example, record

  cat /proc/meminfo | grep Huge

for large page allocations.

> 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?

The "pagesperslab" column of /proc/slabinfo tells you how many pages
slab allocates from the page allocator.

                       Pekka
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