Commit f9690982 authored by Ingo Molnar's avatar Ingo Molnar Committed by Andi Kleen
Browse files

[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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 2ff2d3d7

arch/i386/kernel/tsc.c

+14 −8
Original line number Diff line number Diff line
@@ -112,13 +112,10 @@ unsigned long long sched_clock(void) 
		return (*custom_sched_clock)();



	/*

	 * in the NUMA case we dont use the TSC as they are not

	 * synchronized across all CPUs.

	 * Fall back to jiffies if there's no TSC available:

	 */

#ifndef CONFIG_NUMA

	if (!cpu_khz || check_tsc_unstable())

#endif

		/* no locking but a rare wrong value is not a big deal */

	if (unlikely(tsc_disable))

		/* No locking but a rare wrong value is not a big deal: */

		return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);



	/* read the Time Stamp Counter: */
@@ -198,13 +195,13 @@ EXPORT_SYMBOL(recalibrate_cpu_khz); 
void __init tsc_init(void)

{

	if (!cpu_has_tsc || tsc_disable)

		return;

		goto out_no_tsc;



	cpu_khz = calculate_cpu_khz();

	tsc_khz = cpu_khz;



	if (!cpu_khz)

		return;

		goto out_no_tsc;



	printk("Detected %lu.%03lu MHz processor.\n",

				(unsigned long)cpu_khz / 1000,
@@ -212,6 +209,15 @@ void __init tsc_init(void) 


	set_cyc2ns_scale(cpu_khz);

	use_tsc_delay();

	return;



out_no_tsc:

	/*

	 * Set the tsc_disable flag if there's no TSC support, this

	 * makes it a fast flag for the kernel to see whether it

	 * should be using the TSC.

	 */

	tsc_disable = 1;

}



#ifdef CONFIG_CPU_FREQ

include/asm-i386/bugs.h

+1 −1
Original line number Diff line number Diff line
@@ -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

CRA Git | Maintained and supported by SUSTech CRA and CCSE