Messages in this thread | | | Date | Mon, 09 Apr 2012 09:35:38 +0400 | From | Konstantin Khlebnikov <> | Subject | Re: swapoff() runs forever |
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Richard Weinberger wrote: > Hi! > > I'm observing a strange issue (at least on UML) on recent Linux kernels. > If swap is being used the swapoff() system call never terminates. > To be precise "while ((i = find_next_to_unuse(si, i)) != 0)" in try_to_unuse() > never terminates. > > The affected machine has 256MiB ram and 256MiB swap. > If an application uses more than 256MiB memory swap is being used. > But after the application terminates the free command still reports that a few > MiB are on my swap device and swappoff never terminates.
After last tmpfs changes swapoff can take minutes. Or this time it really never terminates?
> > Here some numbers: > root@linux:~# free > total used free shared buffers cached > Mem: 255472 13520 241952 0 312 7080 > -/+ buffers/cache: 6128 249344 > Swap: 262140 17104 245036 > root@linux:~# cat /proc/meminfo > MemTotal: 255472 kB > MemFree: 241952 kB > Buffers: 312 kB > Cached: 7080 kB > SwapCached: 0 kB > Active: 3596 kB > Inactive: 6076 kB > Active(anon): 1512 kB > Inactive(anon): 848 kB > Active(file): 2084 kB > Inactive(file): 5228 kB > Unevictable: 0 kB > Mlocked: 0 kB > SwapTotal: 262140 kB > SwapFree: 245036 kB > Dirty: 0 kB > Writeback: 0 kB > AnonPages: 2296 kB > Mapped: 1824 kB > Shmem: 80 kB > Slab: 2452 kB > SReclaimable: 1116 kB > SUnreclaim: 1336 kB > KernelStack: 192 kB > PageTables: 556 kB > NFS_Unstable: 0 kB > Bounce: 0 kB > WritebackTmp: 0 kB > CommitLimit: 389876 kB > Committed_AS: 238412 kB > VmallocTotal: 3788784 kB > VmallocUsed: 68 kB > VmallocChunk: 3788716 kB > > What could cause this issue? > I'm not sure whether this is UML specific or not. > Maybe only UML is able to trigger the issue... > > Thanks, > //richard
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