d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

When global timer used at SMP system, update nextevent field on BSP before

Browse Source 
sending IPI to other CPUs. Otherwise, other CPUs will try to honor stale
value, programming timer for zero interval. If timer is fast enough,
it caused extra interrupt before timer correctly reprogrammed by BSP.
This commit is contained in:
Alexander Motin 2010-09-18 07:18:30 +00:00
parent e61d3369bf
commit 8e860de4bf
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
sys/kern/kern_clocksource.c
View File

@ -335,15 +335,15 @@ timercb(struct eventtimer *et, void *arg)
bcast = 0;
if ((et->et_flags & ET_FLAGS_PERCPU) == 0 && smp_started) {
CPU_FOREACH(cpu) {
if (curcpu == cpu)
continue;
state = DPCPU_ID_PTR(cpu, timerstate);
ET_HW_LOCK(state);
state->now = now;
if (bintime_cmp(&now, &state->nextevent, >=)) {
state->nextevent.sec++;
state->ipi = 1;
bcast = 1;
if (curcpu != cpu) {
state->ipi = 1;
bcast = 1;
}
}
ET_HW_UNLOCK(state);
}