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authorNick Piggin <npiggin@suse.de>2007-02-12 00:53:51 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-12 09:48:37 -0800
commitff91691bccdb741efb2df0489058a4961fa79598 (patch)
treeeeef6ce3d48df86a7b2c1178a9ba54210b8b8981 /init
parent0a9ac38246b11892ad20a1eb9deb67adf8c0db2f (diff)
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[PATCH] sched: avoid div in rebalance_tick
Avoid expensive integer divide 3 times per CPU per tick. A userspace test of this loop went from 26ns, down to 19ns on a G5; and from 123ns down to 28ns on a P3. (Also avoid a variable bit shift, as suggested by Alan. The effect of this wasn't noticable on the CPUs I tested with). Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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