Re: [PATCH] mm-slab: allocate kmem_cache with __GFP_REPEAT

From: Konstantin Khlebnikov
Date: Wed Jul 20 2011 - 10:47:58 EST

Eric Dumazet wrote:
Le mercredi 20 juillet 2011 Ã 18:32 +0400, Konstantin Khlebnikov a
Ãcrit :

I catch this on our rhel6-openvz kernel, and yes it very patchy,
but I don't see any reasons why this cannot be reproduced on mainline kernel.

there was abount ten containers with random stuff, node already do intensive swapout but still alive,
in this situation starting new containers sometimes (1 per 1000) fails due to kmem_cache_create failures in nf_conntrack,
there no other messages except:
Unable to create nf_conn slab cache
and some
nf_conntrack: falling back to vmalloc.
(it try allocates huge hash table and do it via vmalloc if kmalloc fails)

Does this kernel contain commit 6d4831c2 ?
(vfs: avoid large kmalloc()s for the fdtable)

yes, but not exactly, in our kerner it looks like:

static inline void * alloc_fdmem(unsigned int size)
if (size <= PAGE_SIZE)
return kmalloc(size, GFP_KERNEL);
return vmalloc(size);

and looks like this change is came from ancient times =)
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