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Date: Tue, 19 Nov 2013 16:12:06 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Alexander Motin <mav@FreeBSD.org>
Subject: Re: svn commit: r258336 - head/sys/vm
Message-ID: <20131119121206.GH7577@FreeBSD.org>
References: <201311191005.rAJA5snM048103@svn.freebsd.org>
 <20131119121109.GG7577@FreeBSD.org>
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On Tue, Nov 19, 2013 at 04:11:09PM +0400, Gleb Smirnoff wrote:
T>   Alexander,
T> 
T> On Tue, Nov 19, 2013 at 10:05:53AM +0000, Alexander Motin wrote:
T> A> Author: mav
T> A> Date: Tue Nov 19 10:05:53 2013
T> A> New Revision: 258336
T> A> URL: http://svnweb.freebsd.org/changeset/base/258336
T> A> 
T> A> Log:
T> A>   Implement soft pressure on UMA cache bucket sizes.
T> A>   
T> A>   Every time system detects low memory condition decrease bucket sizes for
T> A>   each zone by one item.  As result, higher memory pressure will push to
T> A>   smaller bucket sizes and so smaller per-CPU caches and so more efficient
T> A>   memory use.
T> A>   
T> A>   Before this change there was no force to oppose buckets growth as result
T> A>   of practically inevitable zone lock conflicts, and after some run time
T> A>   per-CPU caches could consume enough RAM to kill the system.
T> 
T> Brief review of patch tells me that system never recovers from this. uz_count
T> it decremented only and never incremented.

Do I understand right that r258338 fixes that?


-- 
Totus tuus, Glebius.