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Date: Thu, 26 Jul 2007 11:40:24 +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: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23] * Andrew Morton <akpm@...ux-foundation.org> wrote: > On Thu, 26 Jul 2007 11:20:25 +0200 Ingo Molnar <mingo@...e.hu> wrote: > > > Once we give the kernel the knowledge that the dentry wont be used again > > by this app, the kernel can do a lot more intelligent decision and not > > baloon the dentry cache. > > > > ( we _do_ want to baloon the dentry cache otherwise - for things like > > "find" - having a fast VFS is important. But known-use-once things > > like the daily updatedb job can clearly be annotated properly. ) > > Mutter. /proc/sys/vm/vfs_cache_pressure has been there for what, > three years? Are any distros raising it during the updatedb run yet? but ... that's system-wide, and the 'dont baloon the dcache' is only a property of updatedb. Still, it's useful to debug this thing. below is an updatedb hack that sets vfs_cache_pressure down to 0 during an updatedb run. Could someone who is affected by the 'morning after' problem give it a try? If this works then we can think about any other measures ... 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 0 > /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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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