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authorCon Kolivas <kernel@kolivas.org>2007-03-05 03:30:29 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-05 10:57:51 -0500
commit69f7c0a1be84b10a81b6edcce2dbee0cdec26eba (patch)
treea6d4988fda72595ea71ba7e2b4ac11f91fde0159 /include/asm-i386
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/asm-i386')
-rw-r--r--include/asm-i386/topology.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/asm-i386/topology.h b/include/asm-i386/topology.h
index ac58580ad664..7fc512d90ea8 100644
--- a/include/asm-i386/topology.h
+++ b/include/asm-i386/topology.h
@@ -85,7 +85,6 @@ static inline int node_to_first_cpu(int node)
85 .idle_idx = 1, \ 85 .idle_idx = 1, \
86 .newidle_idx = 2, \ 86 .newidle_idx = 2, \
87 .wake_idx = 1, \ 87 .wake_idx = 1, \
88 .per_cpu_gain = 100, \
89 .flags = SD_LOAD_BALANCE \ 88 .flags = SD_LOAD_BALANCE \
90 | SD_BALANCE_EXEC \ 89 | SD_BALANCE_EXEC \
91 | SD_BALANCE_FORK \ 90 | SD_BALANCE_FORK \