linux-kernel - Re: Memory usage per memory zone

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Date:	Thu, 12 Mar 2009 20:06:49 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	jack marrow <jackmarrow2@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Memory usage per memory zone

On Thu, Mar 12, 2009 at 01:48:50PM +0200, jack marrow wrote:
> >> Sure, but something is unreclaimable... Maybe some process is taking a
> >> lot of shared memory(shm)? What's the output of `lsof`?
> >
> > I can't paste that, but I expect oracle is using it.
> 
> Maybe this is helpful:
> 
> #  ipcs |grep oracle
> 0x00000000 2293770    oracle    640        4194304    22
> 0x00000000 2326539    oracle    640        536870912  22
> 0x880f3334 2359308    oracle    640        266338304  22
> 0x0f9b5efc 1933312    oracle    640        44

Up to 800M shm...

http://lwn.net/Articles/286485/
http://feedblog.org/2009/01/25/splitlru-patch-in-kernel-2628-must-have-for-mysql-and-innodb/

which reads: 

        If you’re running MySQL with InnoDB and an in-memory buffer pool, and
        having paging issues, you probably should upgrade to 2.6.28 ASAP.


Thanks,
Fengguang
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