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Message-ID: <20140608165557.4d97eea4@annuminas.surriel.com> Date: Sun, 8 Jun 2014 16:55:57 -0400 From: Rik van Riel <riel@...hat.com> To: linux-kernel@...r.kernel.org Cc: peterz@...radead.org, mgorman@...e.de, mingo@...nel.org, torvalds@...ux-foundation.org Subject: [PATCH] numa,sched: fix load_to_imbalanced logic inversion This function is supposed to return true if the new load imbalance is worse than the old one. It didn't. I can only hope brown paper bags are in style. Now things converge much better on both the 4 node and 8 node systems. I am not sure why this did not seem to impact specjbb performance on the 4 node system, which is the system I have full-time access to. This bug was introduced recently, with commit e63da036 Signed-off-by: Rik van Riel <riel@...hat.com> --- kernel/sched/fair.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6a90f67..7fb3e47 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1112,7 +1112,7 @@ static bool load_too_imbalanced(long orig_src_load, long orig_dst_load, old_imb = orig_dst_load * 100 - orig_src_load * env->imbalance_pct; /* Would this change make things worse? */ - return (old_imb > imb); + return (imb > old_imb); } /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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