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SubjectZONE_NORMAL exhaustion (dcache slab)
My big NUMA box went OOM over the weekend and started killing things
for no good reason (2.5.43-mm2). Probably running some background
updatedb for locate thing, not doing any real work.

meminfo:

MemTotal: 16077728 kB
MemFree: 14950708 kB
MemShared: 0 kB
Buffers: 492 kB
Cached: 384976 kB
SwapCached: 0 kB
Active: 372608 kB
Inactive: 13380 kB
HighTotal: 15335424 kB
HighFree: 14949000 kB
LowTotal: 742304 kB
LowFree: 1708 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
Mapped: 2248 kB
Slab: 724744 kB
Reserved: 570464 kB
Committed_AS: 1100 kB
PageTables: 140 kB
ReverseMaps: 1518

Big things out of slabinfo:

ext2_inode_cache 554556 554598 416 61622 61622 1 : 120 60
dentry_cache 2791320 2791320 160 116305 116305 1 : 248 124

By my reckoning, that's over 450Mb of dentry cache that's refusing to shrink
under pressure. ext2_inode_cache ain't exactly anorexic either. Hmmm .....
Any good ways to debug this?

M.



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