linux-kernel - Re: 2.6.35-rc1 system oom, many processes killed but memory not free

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Message-ID: <AANLkTiniN949ew8asVksRw6EEBlcs2yy2pZ7Eir33oiy@mail.gmail.com>
Date:	Fri, 25 Jun 2010 15:09:56 +1000
From:	Andrew Hendry <andrew.hendry@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.35-rc1 system oom, many processes killed but memory not free

Yes I made a mistake setting up ramdisk too big, but not sure why it
allowed me to set it up like that.
I think after ramdisk used all the memory, even after unmounting then
other processes still cannot use it.
oom killer gets very aggressive but cannot fix problem.

I have updated to rc3 and will test again on weekend. I will turn on
mem leak checker, is there anything else i should configure?

On Fri, Jun 25, 2010 at 3:00 PM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
>> I left a 2.6.35-rc1 system, ubuntu 10.4/64 building randconfigs in a
>> ramdisk overnight.
>> /dev/ram0              9842848   5141780   4201068  56% /media/ramdisk
>
> your total memory size is 8GB, but ramdisk size is 9.8GB. it's odd settings.
>
>>
>> After about 3 hours oom killer started killing nearly all the
>> processes, but the memory is still not released. Could ramdisk cause
>> this? How can I find out what is still using all the memory?
>
> Could.
> but I'm unclear your case was happen by only ramdisk.
> Can you remove such ramdisk at once?
>
>>
>> cat /proc/meminfo
>> MemTotal:        8187304 kB
>> MemFree:          231976 kB
>> Buffers:             424 kB
>> Cached:            19728 kB
>> SwapCached:        51144 kB
>> Active:            14056 kB
>> Inactive:          72592 kB
>> Active(anon):      12900 kB
>> Inactive(anon):    53940 kB
>> Active(file):       1156 kB
>> Inactive(file):    18652 kB
>> Unevictable:           0 kB
>> Mlocked:               0 kB
>> SwapTotal:       1986556 kB
>> SwapFree:        1504676 kB
>> Dirty:                 0 kB
>> Writeback:         19720 kB
>> AnonPages:         32884 kB
>> Mapped:             4760 kB
>> Shmem:                 4 kB
>> Slab:              51652 kB
>> SReclaimable:      28816 kB
>> SUnreclaim:        22836 kB
>> KernelStack:        2880 kB
>> PageTables:        18484 kB
>> NFS_Unstable:          0 kB
>> Bounce:                0 kB
>> WritebackTmp:          0 kB
>> CommitLimit:     6080208 kB
>> Committed_AS:    1133944 kB
>> VmallocTotal:   34359738367 kB
>> VmallocUsed:      350936 kB
>> VmallocChunk:   34359369212 kB
>> HardwareCorrupted:     0 kB
>> HugePages_Total:       0
>> HugePages_Free:        0
>> HugePages_Rsvd:        0
>> HugePages_Surp:        0
>> Hugepagesize:       2048 kB
>> DirectMap4k:        7616 kB
>> DirectMap2M:     8372224 kB
>
>
>
>
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