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Message-ID: <CAF=P+AjJWefhpXBV+ugPczupvQgXy1vcH4m70hjtEPPJwsky9Q@mail.gmail.com>
Date: Thu, 11 Apr 2013 10:45:23 +0800
From: lulu he <loloseed@...il.com>
To: linux-kernel@...r.kernel.org
Cc: liuhao@...e.com
Subject: mm/slab: extremly high slab cache problem
Hi,
I'am not used to ask but I have followed every piece of information I
could not find solution, so I'am trying here for help.
On one of my server, I have some memory/disk KV service,
Memory KV behave like memcached, ask for a big trunk of memory(10GB)
when initialized,
Disk Kv behave like leveldbd, its random read and sequential write,
and it frequently reads a lot files.
Memory are all alloced using libc malloc.
My KV server process do not consume a lot of memory as below (since
lack of memory, I have killed memory KV, leaving only disk KV, but
free memory still goes down):
:~$top
PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20 0 5030m 3.9g 2772 S 8 6.1 10430:52 tair_server
20 0 4833m 3.9g 4560 S 8 6.1 10171:07 tair_server
20 0 4844m 3.9g 3844 S 38 6.1 10073:32 tair_server
20 0 4765m 3.8g 4144 S 8 6.0 10552:39 tair_server
20 0 2941m 2.4g 9.8m S 0 3.8 256:45.70 tair_server
20 0 2953m 2.4g 12m S 1 3.7 276:54.64 tair_server
BUT, my memory are gone.
$free -m
total used free shared buffers cached
Mem: 64552 57778 6774 0 16 326
-/+ buffers/cache: 57435 7117
Swap: 0 0 0
I can see slab consume lots of my memory, and it's unreclaimable.
$cat /proc/meminfo
MemTotal: 66101892 kB
MemFree: 6816228 kB
Buffers: 17024 kB
Cached: 456640 kB
SwapCached: 0 kB
Active: 19697712 kB
Inactive: 3197312 kB
Active(anon): 19546504 kB
Inactive(anon): 2875632 kB
Active(file): 151208 kB
Inactive(file): 321680 kB
Unevictable: 48 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 6612 kB
Writeback: 72 kB
AnonPages: 22421152 kB
Mapped: 54408 kB
Shmem: 332 kB
Slab: 28870400 kB
SReclaimable: 213344 kB
SUnreclaim: 28657056 kB
KernelStack: 30000 kB
PageTables: 62776 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 33050944 kB
Committed_AS: 37517224 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 388624 kB
VmallocChunk: 34324313700 kB
HardwareCorrupted: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 5696 kB
DirectMap2M: 2082816 kB
DirectMap1G: 65011712 kB
Here is the slab info.
$slabtop -s c
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
69842766 69838389 38% 0.19K 1663025 42 13304200K kmalloc-192
69314912 69314796 38% 0.12K 2166091 32 8664364K kmalloc-128
70866624 70866323 39% 0.06K 1107291 64 4429164K kmalloc-64
69299968 69299592 38% 0.03K 541406 128 2165624K kmalloc-32
128388 72434 56% 0.99K 4230 32 135360K ext4_inode_cache
208782 94112 45% 0.19K 4971 42 39768K dentry
I don't who and why consume such lots memory, and how to solve this.
Can this be an interval kernel error?
OR it's a glibc problem, it do'not return memory back to system, due
to frequently disk read?
thanks in advance, any help will be appreciated.
--
loloseed
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