10 Jul, 2007
1 commit
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simplify sched_rt.c's sched_find_first_bit() function: there are
only 100 RT priority levels left.Signed-off-by: Ingo Molnar
12 Oct, 2006
1 commit
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This likely profiling is pretty fun. I found a few possible problems
in sched.c.This patch may be not measurable, but when I did measure long ago,
nooping (un)likely cost a couple of % on scheduler heavy benchmarks, so
it all adds up.Tweak some branch hints:
- the 2nd 64 bits in the bitmask is likely to be populated, because it
contains the first 28 bits (nearly 3/4) of the normal priorities.
(ratio of 669669:691 ~= 1000:1).- it isn't unlikely that context switching switches to another process. it
might be very rapidly switching to and from the idle process (ratio of
475815:419004 and 471330:423544). Let the branch predictor decide.- preempt_enable seems to be very often called in a nested preempt_disable
or with interrupts disabled (ratio of 3567760:87965 ~= 40:1)Signed-off-by: Nick Piggin
Acked-by: Ingo Molnar
Cc: Daniel Walker
Cc: Hua Zhong
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Mar, 2006
1 commit
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This patch introduces the C-language equivalent of the function: int
sched_find_first_bit(const unsigned long *b);In include/asm-generic/bitops/sched.h
This code largely copied from: include/asm-powerpc/bitops.h
Signed-off-by: Akinobu Mita
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
