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New: kswapd0 randomly high cpu load

Bug 65201 Andrew Morton 1 participant 1 message Nov 22, 2013 1 message not in the archive Memory management

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Andrew Morton

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Quoted 25 lines · On Tue, 19 Nov 2013 19:40:40 +0000 [email protected] 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 protected]
Reporter: [email protected]
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

Quoted 8 lines

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?

Quoted 45 lines

[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
Quoted 5 lines

And I can't kill it. I heared that it's not good idea, but just for lulz)

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