linux-kernel - Relation between nr_dirty and nr

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Message-ID: <a10e25a30711291618r69daa63n265d81c18cf1e06f@mail.gmail.com>
Date:	Thu, 29 Nov 2007 16:18:47 -0800
From:	"Kunal Trivedi" <ktrivedilkml@...il.com>
To:	linuxkernel <linux-kernel@...r.kernel.org>
Subject: Relation between nr_dirty and nr_inactive

Hi,
I am running older kernel (CentOS 2.6.9-34 SMP) on 32 bit arch. Some
of my systems got hung, while trying to write some data to disk. All
those systems exhibit similar pattern where during this time,
/proc/meminfo suggesting 'Inactive' < 'Dirty'. All of machines have 2G
of physical memory and ~1.5G memory is locked (via mlock).

I tried reading code but could not establish any direct relationship
between Zone->in_active pages vs. per-cpu_page_state->nr_dirty.

Has anybody seen system in this kind of state before ? And are these 2
parameters affect each-other ?

Thanks
-Kunal
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