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

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Message-ID: <AANLkTi=yV02oY5AmNAYr+ZF0RUgVv8gkeP+D9_CcOfLi@mail.gmail.com>
Date:	Wed, 24 Nov 2010 16:32:39 +0100
From:	Peter Schüller <scode@...tify.com>
To:	Pekka Enberg <penberg@...nel.org>
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

>> 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.

Those show zero a per my other post. However I got the impression Dave
was asking about regular but larger-than-one-page allocations internal
to the kernel, while the Huge* lines in /proc/meminfo refers to
allocations specifically done by userland applications doing huge page
allocation on a system with huge pages enabled - or am I confused?

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

Seems to be what vmstat -m reports.

-- 
/ Peter Schuller aka scode
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