From 4cbadbd16e2fb727f6926597e0a580829e6222f1 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Mon, 23 May 2011 19:35:04 +0200 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- block/blk-ioc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-ioc.c b/block/blk-ioc.c index b791022beef3..c898049dafd5 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; -- 2.39.2