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authorAnton Blanchard <anton@samba.org>2011-11-03 08:56:22 +1100
committerJames Bottomley <JBottomley@Parallels.com>2011-11-03 11:19:50 +0400
commitf7c9c6bb14f3104608a3a83cadea10a6943d2804 (patch)
tree15d0ddbe43a1053c95e247814daad279690e63ac /drivers/scsi/scsi_scan.c
parentab72002bc53eb8cf06615503878ee71494921fcc (diff)
downloadop-kernel-dev-f7c9c6bb14f3104608a3a83cadea10a6943d2804.zip
op-kernel-dev-f7c9c6bb14f3104608a3a83cadea10a6943d2804.tar.gz
[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>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 44e8ca3..72273a0 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -322,6 +322,7 @@ out_device_destroy:
scsi_device_set_state(sdev, SDEV_DEL);
transport_destroy_device(&sdev->sdev_gendev);
put_device(&sdev->sdev_dev);
+ scsi_free_queue(sdev->request_queue);
put_device(&sdev->sdev_gendev);
out:
if (display_failure_msg)
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