idr: idr_alloc() shouldn't trigger lowmem warning when preloaded
authorTejun Heo <tj@kernel.org>
Wed, 13 Mar 2013 21:59:49 +0000 (14:59 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 13 Mar 2013 22:21:49 +0000 (15:21 -0700)
commit59bfbcf01967d4d3370a2b8294673dd709e732cc
treee868c63aadb6cb943e457ed2e16fcefc151243aa
parent415586c9e6d35ca116af714d7d0bea9c9f998ce5
idr: idr_alloc() shouldn't trigger lowmem warning when preloaded

GFP_NOIO is often used for idr_alloc() inside preloaded section as the
allocation mask doesn't really matter.  If the idr tree needs to be
expanded, idr_alloc() first tries to allocate using the specified
allocation mask and if it fails falls back to the preloaded buffer.  This
order prevent non-preloading idr_alloc() users from taking advantage of
preloading ones by using preload buffer without filling it shifting the
burden of allocation to the preload users.

Unfortunately, this allowed/expected-to-fail kmem_cache allocation ends up
generating spurious slab lowmem warning before succeeding the request from
the preload buffer.

This patch makes idr_layer_alloc() add __GFP_NOWARN to the first
kmem_cache attempt and try kmem_cache again w/o __GFP_NOWARN after
allocation from preload_buffer fails so that lowmem warning is generated
if not suppressed by the original @gfp_mask.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: David Teigland <teigland@redhat.com>
Tested-by: David Teigland <teigland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/idr.c