From f9690982b8c2f9a2c65acdc113e758ec356676a3 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 13 Feb 2007 13:26:22 +0100 Subject: [PATCH] i386: improve sched_clock() on i686 Clean up sched_clock() on i686: it will use the TSC if available and falls back to jiffies only if the user asked for it to be disabled via notsc or the CPU calibration code didnt figure out the right cpu_khz. This generally makes the scheduler timestamps more finegrained, on all hardware. (the current scheduler is pretty resistant against asynchronous sched_clock() values on different CPUs, it will allow at most up to a jiffy of jitter.) Also simplify sched_clock()'s check for TSC availability: propagate the desire and ability to use the TSC into the tsc_disable flag, previously this flag only indicated whether the notsc option was passed. This makes the rare low-res sched_clock() codepath a single branch off a read-mostly flag. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen --- include/asm-i386/bugs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/asm-i386') diff --git a/include/asm-i386/bugs.h b/include/asm-i386/bugs.h index 38f1aebbbdb5..c90c7c499302 100644 --- a/include/asm-i386/bugs.h +++ b/include/asm-i386/bugs.h @@ -160,7 +160,7 @@ static void __init check_config(void) * If we configured ourselves for a TSC, we'd better have one! */ #ifdef CONFIG_X86_TSC - if (!cpu_has_tsc) + if (!cpu_has_tsc && !tsc_disable) panic("Kernel compiled for Pentium+, requires TSC feature!"); #endif -- cgit v1.2.2