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SubjectRe: 2.6.35-rc1 system oom, many processes killed but memory not free
Date
> 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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