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authorIngo Molnar <mingo@elte.hu>2008-04-23 09:24:06 +0200
committerIngo Molnar <mingo@elte.hu>2008-05-05 23:56:18 +0200
commitdfbf4a1bc319f0f9a31e39b2da1fa5c55e85af89 (patch)
tree0b9dd19406c53a93452dd345bb05f76aa712a757 /init
parentcb4ad1ffc7c0d8ea7dc8cd8ba303d83551716d46 (diff)
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sched: fix cpu clock
David Miller pointed it out that nothing in cpu_clock() sets prev_cpu_time. This caused __sync_cpu_clock() to be called all the time - against the intention of this code. The result was that in practice we hit a global spinlock every time cpu_clock() is called - which - even though cpu_clock() is used for tracing and debugging, is suboptimal. While at it, also: - move the irq disabling to the outest layer, this should make cpu_clock() warp-free when called with irqs enabled. - use long long instead of cycles_t - for platforms where cycles_t is 32-bit. Reported-by: David Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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