From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Sat, 25 Jun 2005 21:57:12 +0000 (-0700)
Subject: [PATCH] sched: less aggressive idle balancing
X-Git-Tag: v2.6.13-rc1~68^2~153
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99b61ccf0bf0e9a85823d39a5db6a1519caeb13d;p=linux-2.6

[PATCH] sched: less aggressive idle balancing

Remove the special casing for idle CPU balancing.  Things like this are
hurting for example on SMT, where are single sibling being idle doesn't really
warrant a really aggressive pull over the NUMA domain, for example.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index 8b035a8b3c..f665de34ed 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1877,15 +1877,9 @@ nextgroup:
 
 	/* Get rid of the scaling factor, rounding down as we divide */
 	*imbalance = *imbalance / SCHED_LOAD_SCALE;
-
 	return busiest;
 
 out_balanced:
-	if (busiest && (idle == NEWLY_IDLE ||
-			(idle == SCHED_IDLE && max_load > SCHED_LOAD_SCALE)) ) {
-		*imbalance = 1;
-		return busiest;
-	}
 
 	*imbalance = 0;
 	return NULL;