I have an amd64 4.7.1 system (upstream kernel, pretty regular config)
with a small file system:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 922595184 800396464 122198720 87% /
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sda1 504110496 15305094 488805402 4% /
The odd thing is that after a while, XFS consumes a lot of memory
according to slabtop:
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
4121208 4121177 99% 0.88K 1030302 4 4121208K xfs_inode
986286 985229 99% 0.19K 46966 21 187864K dentry
723255 723076 99% 0.10K 18545 39 74180K buffer_head
270263 269251 99% 0.56K 38609 7 154436K radix_tree_node
140310 67409 48% 0.38K 14031 10 56124K mnt_cache
(I have attached the /proc/meminfo contents in case it offers further
clues.)
Confronted with large memory allocations (from âmake -j12â and
compiling GCC, so perhaps ~8 GiB of memory), the OOM killer kicks in
and kills some random process. I would have expected that some
xfs_inodes are freed instead.
I don't think this is an ordinary memory leak. The last time I saw
something like the slabtop output above, I could do âsysctl
vm.drop_caches = 3â, and the amount of memory allocated reported by
slabtop was reduced considerably. (I have not checked if the memory
was actually returned to the system.) I have not done this now so
that I can gather further data for debugging. I am not sure what
triggers this huge allocation. It could be related to my Gnus mail
spool (which contains lots and lots of small files).
MemTotal: 12300808 kB
MemFree: 1744132 kB
MemAvailable: 10325076 kB
Buffers: 0 kB
Cached: 4726892 kB
SwapCached: 32 kB
Active: 3094868 kB
Inactive: 2307968 kB
Active(anon): 303736 kB
Inactive(anon): 738188 kB
Active(file): 2791132 kB
Inactive(file): 1569780 kB
Unevictable: 32 kB
Mlocked: 32 kB
SwapTotal: 14645244 kB
SwapFree: 14644796 kB
Dirty: 28 kB
Writeback: 0 kB
AnonPages: 676016 kB
Mapped: 290956 kB
Shmem: 365980 kB
Slab: 4646696 kB
SReclaimable: 4542188 kB
SUnreclaim: 104508 kB
KernelStack: 8112 kB
PageTables: 18148 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 20795648 kB
Committed_AS: 4926352 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 609792 kB
DirectMap2M: 11964416 kB
DirectMap1G: 2097152 kB
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