* [PATCH] blk-cgroup: Initialize ioc->cgroup_changed at ioc creation time
@ 2011-05-23 14:55 Vivek Goyal
2011-05-23 17:35 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Vivek Goyal @ 2011-05-23 14:55 UTC (permalink / raw)
To: Jens Axboe, linux kernel mailing list; +Cc: Paul Bolle
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>
---
block/blk-ioc.c | 3 +++
1 file changed, 3 insertions(+)
Index: linux-2.6-block/block/blk-ioc.c
===================================================================
--- linux-2.6-block.orig/block/blk-ioc.c 2011-03-08 09:40:58.057296008 -0500
+++ linux-2.6-block/block/blk-ioc.c 2011-05-23 10:33:51.875994035 -0400
@@ -96,6 +96,9 @@ struct io_context *alloc_io_context(gfp_
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;
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2011-05-23 14:55 [PATCH] blk-cgroup: Initialize ioc->cgroup_changed at ioc creation time Vivek Goyal
2011-05-23 17:35 ` Jens Axboe
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