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authorAnton Blanchard <anton@samba.org>2011-11-03 01:56:22 +0400
committerJames Bottomley <JBottomley@Parallels.com>2011-11-03 11:19:50 +0400
commitf7c9c6bb14f3104608a3a83cadea10a6943d2804 (patch)
tree15d0ddbe43a1053c95e247814daad279690e63ac /drivers/firmware
parentab72002bc53eb8cf06615503878ee71494921fcc (diff)
downloadlinux-f7c9c6bb14f3104608a3a83cadea10a6943d2804.tar.xz
[SCSI] Fix block queue and elevator memory leak in scsi_alloc_sdev
When looking at memory consumption issues I noticed quite a lot of memory in the kmalloc-2048 bucket: OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 6561 6471 98% 2.30K 243 27 15552K kmalloc-2048 Over 15MB. slub debug shows that cfq is responsible for almost all of it: # sort -nr /sys/kernel/slab/kmalloc-2048/alloc_calls 6402 .cfq_init_queue+0xec/0x460 age=43423/43564/43655 pid=1 cpus=4,11,13 In scsi_alloc_sdev we do scsi_alloc_queue but if slave_alloc fails we don't free it with scsi_free_queue. The patch below fixes the issue: OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 135 72 53% 2.30K 5 27 320K kmalloc-2048 # cat /sys/kernel/slab/kmalloc-2048/alloc_calls 3 .cfq_init_queue+0xec/0x460 age=3811/3876/3925 pid=1 cpus=4,11,13 Signed-off-by: Anton Blanchard <anton@samba.org> Cc: <stable@kernel.org> #2.6.38+ Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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