linux-kernel - Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

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Message-ID: <20070726102406.GA30165@elte.hu>
Date:	Thu, 26 Jul 2007 12:24:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Frank Kingswood <frank@...gswood-consulting.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	ck list <ck@....kolivas.org>, Paul Jackson <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: RFT: updatedb "morning after" problem [was: Re: -mm merge
	plans for 2.6.23]


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> Setting it to zero will maximise the preservation of the vfs caches.  
> You wanted 10000 there.

ok, updated patch below :-)

> <bets that nobody will test this>

wrong, it's active on three of my boxes already :) But then again, i 
never had these hangover problems. (not really expected with gigs of RAM 
anyway)

	Ingo

--- /etc/cron.daily/mlocate.cron.orig
+++ /etc/cron.daily/mlocate.cron
@@ -1,4 +1,7 @@
 #!/bin/sh
 nodevs=$(< /proc/filesystems awk '$1 == "nodev" { print $2 }')
 renice +19 -p $$ >/dev/null 2>&1
+PREV=`cat /proc/sys/vm/vfs_cache_pressure 2>/dev/null`
+echo 10000 > /proc/sys/vm/vfs_cache_pressure 2>/dev/null
 /usr/bin/updatedb -f "$nodevs"
+[ "$PREV" != "" ] && echo $PREV > /proc/sys/vm/vfs_cache_pressure 2>/dev/null
-
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