[SCSI] Fix block queue and elevator memory leak in scsi_alloc_sdev
authorAnton Blanchard <anton@samba.org>
Wed, 2 Nov 2011 21:56:22 +0000 (08:56 +1100)
committerJames Bottomley <JBottomley@Parallels.com>
Thu, 3 Nov 2011 07:19:50 +0000 (11:19 +0400)
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>
drivers/scsi/scsi_scan.c

index 44e8ca398efa790083006131f5adb3bf37cd57aa..72273a0e56662569931f812b6f628a3e3a4748c8 100644 (file)
@@ -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)