Comment 155 for bug 1518457

(switched to email. Please respond via emailed reply-to-all, not via the
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On Tue, 19 Nov 2013 19:40:40 +0000 <email address hidden> wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=65201
>
> Bug ID: 65201
> Summary: kswapd0 randomly high cpu load
> Product: Memory Management
> Version: 2.5
> Kernel Version: 3.12
> Hardware: x86-64
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: Other
> Assignee: <email address hidden>
> Reporter: <email address hidden>
> Regression: No
>
> kswapd0 randomly load one core of CPU by 100%
>
> Linux localhost 3.12.0-1-ARCH #1 SMP PREEMPT Wed Nov 6 09:06:27 CET 2013
> x86_64
> GNU/Linux
>
> No swap enabled
>
> Befor on same laptop was installed Ubuntu 12.04 and kernel 3.2 32-bit pae,
> and
> there is no such problem.
>
> [root@localhost ~]# free -mh
> total used free shared buffers cached
> Mem: 3.8G 2.4G 1.3G 0B 150M 508M
> -/+ buffers/cache: 1.8G 2.0G
> Swap: 0B 0B 0B

hm, I wonder what kswapd is up to.

Could you please make it happen again and then

dmesg -n 7
dmesg -c
echo m > /proc/sysrq-trigger
echo t > /proc/sysrq-trigger
dmesg -s 1000000 > foo

then send us foo?

>
> [root@localhost ~]# cat /proc/meminfo
> MemTotal: 3935792 kB
> MemFree: 1381360 kB
> Buffers: 154216 kB
> Cached: 533096 kB
> SwapCached: 0 kB
> Active: 1958896 kB
> Inactive: 438004 kB
> Active(anon): 1740916 kB
> Inactive(anon): 136292 kB
> Active(file): 217980 kB
> Inactive(file): 301712 kB
> Unevictable: 0 kB
> Mlocked: 0 kB
> SwapTotal: 0 kB
> SwapFree: 0 kB
> Dirty: 2064 kB
> Writeback: 0 kB
> AnonPages: 1709628 kB
> Mapped: 196696 kB
> Shmem: 167620 kB
> Slab: 81516 kB
> SReclaimable: 61312 kB
> SUnreclaim: 20204 kB
> KernelStack: 1696 kB
> PageTables: 13088 kB
> NFS_Unstable: 0 kB
> Bounce: 0 kB
> WritebackTmp: 0 kB
> CommitLimit: 1967896 kB
> Committed_AS: 3498576 kB
> VmallocTotal: 34359738367 kB
> VmallocUsed: 361304 kB
> VmallocChunk: 34359300731 kB
> HardwareCorrupted: 0 kB
> AnonHugePages: 157696 kB
> HugePages_Total: 0
> HugePages_Free: 0
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 2048 kB
> DirectMap4k: 18476 kB
> DirectMap2M: 4059136 kB
>
> And I can't kill it. I heared that it's not good idea, but just for lulz)
>
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