From: Ingo Molnar Date: Wed, 23 Apr 2008 07:24:06 +0000 (+0200) Subject: sched: fix cpu clock X-Git-Tag: v2.6.26-rc2~62^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfbf4a1bc319f0f9a31e39b2da1fa5c55e85af89;p=pandora-kernel.git 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 Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed