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Subject[tip:sched/core] sched/numa: Simplify task_numa_compare()
Commit-ID:  1c5d3eb3759013bc7ee4197aa0a9f245bdb6eb90
Gitweb: http://git.kernel.org/tip/1c5d3eb3759013bc7ee4197aa0a9f245bdb6eb90
Author: Rik van Riel <riel@redhat.com>
AuthorDate: Mon, 23 Jun 2014 11:46:15 -0400
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 5 Jul 2014 11:17:37 +0200

sched/numa: Simplify task_numa_compare()

When a task is part of a numa_group, the comparison should always use
the group weight, in order to make workloads converge.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: chegu_vinod@hp.com
Cc: mgorman@suse.de
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1403538378-31571-4-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/fair.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d6526d2..cebb312 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1154,7 +1154,7 @@ static void task_numa_compare(struct task_numa_env *env,
struct task_group *tg;
long src_load, dst_load;
long load;
- long imp = (groupimp > 0) ? groupimp : taskimp;
+ long imp = env->p->numa_group ? groupimp : taskimp;

rcu_read_lock();
cur = ACCESS_ONCE(dst_rq->curr);
@@ -1192,11 +1192,6 @@ static void task_numa_compare(struct task_numa_env *env,
* itself (not part of a group), use the task weight
* instead.
*/
- if (env->p->numa_group)
- imp = groupimp;
- else
- imp = taskimp;
-
if (cur->numa_group)
imp += group_weight(cur, env->src_nid) -
group_weight(cur, env->dst_nid);

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