From: Petr Tesarik <ptesarik@suse.cz>
To: linux-mm@kvack.org
Subject: Re: Strange VM stats in /proc/zoneinfo
Date: Wed, 15 Aug 2012 13:37:19 +0200 [thread overview]
Message-ID: <201208151337.19919.ptesarik@suse.cz> (raw)
In-Reply-To: <201208151105.27411.ptesarik@suse.cz>
Dne St 15. srpna 2012 11:05:27 Petr Tesarik napsal(a):
> Hi folks,
>
> while looking at my /proc/zoneinfo, I noticed that the counters are a bit
> strange:
>
> Node 0, zone DMA
> pages free 3945
> min 7
> low 8
> high 10
> scanned 0
> spanned 4080
> present 3905
> nr_free_pages 3945
>
> OK, you'll probably argue that the rest is hidden in PCP differentials...
> BUT:
>
> 1. this machine has only 2 CPUs
> 2. stat_threshold = 4
> 3. vm_stat_diff[NR_FREE_PAGES] = 0 on both CPUs
>
> Is this only me? Or do I misrepresent what these number actually tell?
I verified the free lists, and this part seems sane, so the "present" count
must be wrong. FYI I can see this on various x86_64 kernels between 2.6.32 and
3.5.0.
Petr Tesarik
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next prev parent reply other threads:[~2012-08-15 11:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-15 9:05 Strange VM stats in /proc/zoneinfo Petr Tesarik
2012-08-15 11:37 ` Petr Tesarik [this message]
2012-08-15 19:01 ` Rik van Riel
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