[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2] xen: export do_yield as vcpu_yield
On 07/23/2014 01:05 PM, Stefano Stabellini wrote: Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> CC: george.dunlap@xxxxxxxxxxxxx CC: JBeulich@xxxxxxxx --- xen/common/schedule.c | 10 +++++----- xen/include/xen/sched.h | 1 + 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/xen/common/schedule.c b/xen/common/schedule.c index e9eb0bc..6631dc8 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -795,9 +795,8 @@ static long do_poll(struct sched_poll *sched_poll) }/* Voluntarily yield the processor for this allocation. */-static long do_yield(void) +void vcpu_yield(struct vcpu *v) What are you actually trying to do here? Why do you add a vcpu struct, when all the callers (including the one you add in 2/2) just pass current? { - struct vcpu * v=current; spinlock_t *lock = vcpu_schedule_lock_irq(v);SCHED_OP(VCPU2OP(v), yield, v);@@ -805,7 +804,6 @@ static long do_yield(void)TRACE_2D(TRC_SCHED_YIELD, current->domain->domain_id, current->vcpu_id);raise_softirq(SCHEDULE_SOFTIRQ); This is broken: it's still tracing current instead of v, and you're raising the schedule softirq on the current cpu rather than on the cpu on which v is running. If v!=current, you have to go through force reschedule for safety. Just rename the function and make it non-static, leaving the arguments and return value alone. -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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