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[PATCH] X86_64 monotonic_clock goes backwards 

I've noticed some erratic behavior while testing the X86_64 version
of monotonic_clock().

While spinning in a loop reading monotonic clock values (pinned to a
single cpu) I noticed that the difference between subsequent values
occasionally went negative (time going backwards).

I found that in the following code:
                this_offset = get_cycles_sync();
                /* FIXME: 1000 or 1000000? */
-->             offset = (this_offset - last_offset)*1000 / cpu_khz;
        }
        return base + offset;

the offset sometimes turns out to be 0, even though
this_offset > last_offset.

+Added fix From: Toyo Abe <toyoa@mvista.com>

The x86_64-mm-monotonic-clock.patch in 2.6.18-rc4-mm2 made a change to
the updating of monotonic_base. It now uses cycles_2_ns().

I suggest that a set_cyc2ns_scale() should be done prior to the setup_irq().
Because cycles_2_ns() can be called from the timer ISR right after the irq0
is enabled.

Signed-off-by: Toyo Abe <toyoa@mvista.com>
Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Dimitri Sivanich 2006-09-26 10:52:34 +02:00 committed by Andi Kleen
parent d28c4393a7
commit cbf9b4bb76
1 changed files with 4 additions and 7 deletions
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11
arch/x86_64/kernel/time.c
View File

@ -276,6 +276,7 @@ static void set_rtc_mmss(unsigned long nowtime)
* Note: This function is required to return accurate
* time even in the absence of multiple timer ticks.
*/
static inline unsigned long long cycles_2_ns(unsigned long long cyc);
unsigned long long monotonic_clock(void)
{
unsigned long seq;
@ -300,8 +301,7 @@ unsigned long long monotonic_clock(void)
base = monotonic_base;
} while (read_seqretry(&xtime_lock, seq));
this_offset = get_cycles_sync();
/* FIXME: 1000 or 1000000? */
offset = (this_offset - last_offset)*1000 / cpu_khz;
offset = cycles_2_ns(this_offset - last_offset);
}
return base + offset;
}
@ -405,8 +405,7 @@ void main_timer_handler(struct pt_regs *regs)
offset %= USEC_PER_TICK;
}
/* FIXME: 1000 or 1000000? */
monotonic_base += (tsc - vxtime.last_tsc) * 1000000 / cpu_khz;
monotonic_base += cycles_2_ns(tsc - vxtime.last_tsc);
vxtime.last_tsc = tsc - vxtime.quot * delay / vxtime.tsc_quot;
@ -929,10 +928,8 @@ void __init time_init(void)
vxtime.quot = (USEC_PER_SEC << US_SCALE) / vxtime_hz;
vxtime.tsc_quot = (USEC_PER_MSEC << US_SCALE) / cpu_khz;
vxtime.last_tsc = get_cycles_sync();
setup_irq(0, &irq0);
set_cyc2ns_scale(cpu_khz);
setup_irq(0, &irq0);
hotcpu_notifier(time_cpu_notifier, 0);
time_cpu_notifier(NULL, CPU_ONLINE, (void *)(long)smp_processor_id());