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authorCon Kolivas <kernel@kolivas.org>2007-03-05 00:30:29 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-05 07:57:51 -0800
commit69f7c0a1be84b10a81b6edcce2dbee0cdec26eba (patch)
treea6d4988fda72595ea71ba7e2b4ac11f91fde0159 /include/linux/sched.h
parent759b9775c25f5e69aaea8a75c3914019e2dc5539 (diff)
[PATCH] sched: remove SMT nice
Remove the SMT-nice feature which idles sibling cpus on SMT cpus to facilitiate nice working properly where cpu power is shared. The idling of cpus in the presence of runnable tasks is considered too fragile, easy to break with outside code, and the complexity of managing this system if an architecture comes along with many logical cores sharing cpu power will be unworkable. Remove the associated per_cpu_gain variable in sched_domains used only by this code. Also: The reason is that with dynticks enabled, this code breaks without yet further tweaks so dynticks brought on the rapid demise of this code. So either we tweak this code or kill it off entirely. It was Ingo's preference to kill it off. Either way this needs to happen for 2.6.21 since dynticks has gone in. Signed-off-by: Con Kolivas <kernel@kolivas.org> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6f7c9a4d80e..49fe2997a01 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -684,7 +684,6 @@ struct sched_domain {
unsigned int imbalance_pct; /* No balance until over watermark */
unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
- unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
unsigned int busy_idx;
unsigned int idle_idx;
unsigned int newidle_idx;