From: Anton Blanchard <anton@samba.org>
From: Nathan Lynch <nathanl@austin.ibm.com>
The current code does schedule_timeout(HZ) when waiting for a cpu to die,
which is a bit coarse and tends to limit the "throughput" of my stress
tests :)
Change the HZ timeout to HZ/5, increase the number of tries to 25 so the
overall wait time is similar. In practice, I've never seen the loop need
more than two iterations.
Signed-off-by: Nathan Lynch <nathanl@austin.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/ppc64/kernel/smp.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff -puN arch/ppc64/kernel/smp.c~ppc64-cpu-death-sched-timeout arch/ppc64/kernel/smp.c
--- 25/arch/ppc64/kernel/smp.c~ppc64-cpu-death-sched-timeout 2004-08-18 21:30:12.010977128 -0700
+++ 25-akpm/arch/ppc64/kernel/smp.c 2004-08-18 21:30:12.015976368 -0700
@@ -272,13 +272,13 @@ void __cpu_die(unsigned int cpu)
int cpu_status;
unsigned int pcpu = get_hard_smp_processor_id(cpu);
- for (tries = 0; tries < 5; tries++) {
+ for (tries = 0; tries < 25; tries++) {
cpu_status = query_cpu_stopped(pcpu);
if (cpu_status == 0)
break;
set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ);
+ schedule_timeout(HZ/5);
}
if (cpu_status != 0) {
printk("Querying DEAD? cpu %i (%i) shows %i\n",
_