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authorVivek Goyal <vgoyal@redhat.com>2011-05-23 19:35:04 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-05-23 19:35:04 +0200
commit4cbadbd16e2fb727f6926597e0a580829e6222f1 (patch)
treed3482b68a6743609cedcd3a5165a749b0d9ca990 /block/blk-ioc.c
parent7e69723fef8771a9d57bd27d36281d756130b4b5 (diff)
downloadvexpress-lsk-4cbadbd16e2fb727f6926597e0a580829e6222f1.tar.gz
blk-cgroup: Initialize ioc->cgroup_changed at ioc creation time
If we don't explicitly initialize it to zero, CFQ might think that cgroup of ioc has changed and it generates lots of unnecessary calls to call_for_each_cic(changed_cgroup). Fix it. cfq_get_io_context() cfq_ioc_set_cgroup() call_for_each_cic(ioc, changed_cgroup) Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-ioc.c')
-rw-r--r--block/blk-ioc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index b791022beef..c898049dafd 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -96,6 +96,9 @@ struct io_context *alloc_io_context(gfp_t gfp_flags, int node)
INIT_RADIX_TREE(&ret->radix_root, GFP_ATOMIC | __GFP_HIGH);
INIT_HLIST_HEAD(&ret->cic_list);
ret->ioc_data = NULL;
+#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
+ ret->cgroup_changed = 0;
+#endif
}
return ret;