linux-kernel - Re: [RFC][PATCH] update /proc/sys/vm/drop

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Date:	Wed, 15 Sep 2010 12:27:01 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	lnxninja@...ux.vnet.ibm.com
Subject: Re: [RFC][PATCH] update /proc/sys/vm/drop_caches documentation

On Wed, 2010-09-15 at 11:37 -0700, Eric W. Biederman wrote:
> > I'm worried that there are users out there experiencing real problems
> > that aren't reporting it because "workarounds" like this just paper over
> > the issue.
> 
> For what it is worth.  I had a friend ask me about a system that had 50%
> of it's memory consumed by slab caches.  20GB out of 40GB.  The kernel
> was suse? 2.6.27 so it's old, but if you are curious.
> /proc/sys/vm/drop_caches does nothing in that case. 

Was it the reclaimable caches doing it, though?  The other really common
cause is kmalloc() leaks.

-- Dave

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