linux-kernel - Re: Memory usage per memory zone

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Message-ID: <e2dc2c680903120438i27e209c2h28c61704299b8b4f@mail.gmail.com>
Date:	Thu, 12 Mar 2009 12:38:46 +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
Subject: Re: Memory usage per memory zone

> 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.

>
>> >
>> > MemTotal:      1034496 kB
>> > MemFree:         95600 kB
>> > Buffers:         49916 kB
>> > Cached:         761544 kB
>> > SwapCached:          0 kB
>> > Active:          80484 kB
>> > Inactive:       749960 kB
>> > HighTotal:      131008 kB
>> > HighFree:        68480 kB
>> > LowTotal:       903488 kB
>> > LowFree:         27120 kB
>> > SwapTotal:     2040212 kB
>> > SwapFree:      2039780 kB
>> > Dirty:               4 kB
>> > Writeback:           0 kB
>> > Mapped:          32636 kB
>> > Slab:            93856 kB
>> > CommitLimit:   2557460 kB
>> > Committed_AS:   129980 kB
>> > PageTables:       1800 kB
>> > VmallocTotal:   106488 kB
>> > VmallocUsed:      3372 kB
>> > VmallocChunk:   102616 kB
>> > HugePages_Total:     0
>> > HugePages_Free:      0
>> > Hugepagesize:     2048 kB
>> >
>> > Is upgrading the kernel an option for you?
>>
>> No :(
>>
>> I think shoving some more ram in the box is the best doable option.
>> Would this help here?
>
> There have been huge amounts of change sets in mm area since 2.6.9...
>
>> To do that I need to say "look at how much cache we are using for
>> files, that cache is in the high mem zone (look here) so let's put
>> some more ram in". Does the cache always live in the high mem zone?
>
> Both highmem and normal zones will be used for caches.
>
> Thanks,
> Fengguang
>
>

Thanks.
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