From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Date: Fri, 20 Jan 2006 02:18:43 +0000 Subject: Re: [PATCH] SN2 user-MMIO CPU migration Message-Id: <200601191818.43157.jbarnes@virtuousgeek.org> List-Id: References: <20060118163305.Y42462@chenjesu.americas.sgi.com> In-Reply-To: <20060118163305.Y42462@chenjesu.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Brent Casavant Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, jes@sgi.com, tony.luck@intel.com On Thursday, January 19, 2006 4:06 pm, Brent Casavant wrote: > #ifndef __ARCH_WANT_UNLOCKED_CTXSW > static inline int task_running(runqueue_t *rq, task_t *p) > @@ -936,6 +939,7 @@ static int migrate_task(task_t *p, int d > * it is sufficient to simply update the task's cpu field. > */ > if (!p->array && !task_running(rq, p)) { > + arch_task_migrate(p); > set_task_cpu(p, dest_cpu); > return 0; > } > @@ -1353,6 +1357,7 @@ static int try_to_wake_up(task_t *p, uns > out_set_cpu: > new_cpu = wake_idle(new_cpu, p); > if (new_cpu != cpu) { > + arch_task_migrate(p); > set_task_cpu(p, new_cpu); > task_rq_unlock(rq, &flags); > /* might preempt at this point */ > @@ -1876,6 +1881,7 @@ void pull_task(runqueue_t *src_rq, prio_ > { > dequeue_task(p, src_array); > dec_nr_running(p, src_rq); > + arch_task_migrate(p); > set_task_cpu(p, this_cpu); > inc_nr_running(p, this_rq); > enqueue_task(p, this_array); > @@ -4547,6 +4553,7 @@ static void __migrate_task(struct task_s > if (!cpu_isset(dest_cpu, p->cpus_allowed)) > goto out; > > + arch_task_migrate(p); > set_task_cpu(p, dest_cpu); > if (p->array) { > /* Maybe you could just turn the above into mmiowb() calls instead? That would cover altix, origin, and ppc as well I think. On other platforms it would be a complete no-op. Jesse