linux-kernel - Re: Memory usage per memory zone

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Date:	Thu, 12 Mar 2009 13:01:49 +0100
From:	jack marrow <jackmarrow2@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Memory usage per memory zone

2009/3/12 Wu Fengguang <fengguang.wu@...el.com>:
> 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
>

Thanks for all your help.
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