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Re: 10GB memorys occupied by XFS

To: xfs@xxxxxxxxxxx
Subject: Re: 10GB memorys occupied by XFS
From: daiguochao <dx-wl@xxxxxxx>
Date: Thu, 10 Apr 2014 19:40:44 -0700 (PDT)
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1396596386220-35015.post@xxxxxxxxxxxxx>
References: <1396596386220-35015.post@xxxxxxxxxxxxx>
Dear Stan, I can't send email to you.So I leave a message here.I hope not to
bother you.
Thank you for your kind assistance.

In accordance with your suggestion, we executed "echo 3 >
/proc/sysm/drop_caches" for trying to release vfs dentries and inodes.
Really,
our lost memory came back. But we learned that the memory of vfs dentries
and inodes is distributed from slab. Please check our system "Slab:  509708
kB" from /proc/meminfo, and it seems only be took up 500MB and xfs_buf take
up 450MB among. And /proc/meminfo indicated that our system memory is
anomalous, there is about 10GB out of the statistics. We want to know how
the system could observe the usage amount of vfs dentries and iodes through
the system interface. If the memory usage of system is not reflected in
/proc/meminfo as we can not find the statistics, and we thought it as a bug
of xfs.

My  vm.vfs_cache_pressure of linux system is 100. We think that the system
will proactively take the memory back when the memory is not enough, rather
than oom-killer kills our work process. Our datas of /proc/meminfo occurred
during the system problem as below:
130> cat /proc/meminfo 
MemTotal:       12173268 kB 
MemFree:          223044 kB 
Buffers:             244 kB 
Cached:             4540 kB 
SwapCached:            0 kB 
Active:             1700 kB 
Inactive:           5312 kB 
Active(anon):       1616 kB 
Inactive(anon):     1128 kB 
Active(file):         84 kB 
Inactive(file):     4184 kB 
Unevictable:           0 kB 
Mlocked:               0 kB 
SwapTotal:             0 kB 
SwapFree:              0 kB 
Dirty:                 0 kB 
Writeback:             0 kB 
AnonPages:          2556 kB 
Mapped:             1088 kB 
Shmem:               196 kB 
Slab:             509708 kB 
SReclaimable:       7596 kB 
SUnreclaim:       502112 kB 
KernelStack:        1096 kB 
PageTables:          748 kB 
NFS_Unstable:          0 kB 
Bounce:                0 kB 
WritebackTmp:          0 kB 
CommitLimit:     6086632 kB 
Committed_AS:       9440 kB 
VmallocTotal:   34359738367 kB 
VmallocUsed:      303488 kB 
VmallocChunk:   34359426132 kB 
HardwareCorrupted:     0 kB 
AnonHugePages:         0 kB 
HugePages_Total:       0 
HugePages_Free:        0 
HugePages_Rsvd:        0 
HugePages_Surp:        0 
Hugepagesize:       2048 kB 
DirectMap4k:        6152 kB 
DirectMap2M:     2070528 kB 
DirectMap1G:    10485760 kB

Best Regards,

Guochao



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