linux-kernel - Re: Memory usage per memory zone

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Message-ID: <20090312115147.GA20785@localhost>
Date:	Thu, 12 Mar 2009 19:51:47 +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 01:38:46PM +0200, jack marrow wrote:
> > Can you paste the /proc/meminfo after doing 'echo 3 > drop_caches'?
> 
> http://pastebin.com/mce24730
> 
> >> I thought the kernel dropped caches if a program needs the ram?
> >
> > 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.

Oh well...

But from the meminfo, there are 1.2G mapped pages. That could be a big
trouble for reclaiming.  Recent kernels can better handle this situation.

Thanks,
Fengguang
---

# cat /proc/meminfo
MemTotal:      3895404 kB
MemFree:       2472656 kB
Buffers:           412 kB
Cached:         239716 kB
SwapCached:     202652 kB
Active:        1275212 kB
Inactive:        34584 kB
HighTotal:     3014592 kB
HighFree:      1684032 kB
LowTotal:       880812 kB
LowFree:        788624 kB
SwapTotal:     2040212 kB
SwapFree:      1626756 kB
Dirty:             104 kB
Writeback:           0 kB
Mapped:        1247000 kB
Slab:            80040 kB
CommitLimit:   3987912 kB
Committed_AS:  8189040 kB
PageTables:      18792 kB
VmallocTotal:   106488 kB
VmallocUsed:      3072 kB
VmallocChunk:   102980 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB
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