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authorPeter Zijlstra <peterz@infradead.org>2013-10-07 11:29:16 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-09 12:40:46 +0200
commitac66f5477239ebd3c4e2cbf2f591ef387aa09884 (patch)
treed340545fa9235f4369c2bd50852fa3a2b7e807f1 /kernel/sched/idle_task.c
parent1be0bd77c5dd7c903f46abf52f9a3650face3c1d (diff)
downloadop-kernel-dev-ac66f5477239ebd3c4e2cbf2f591ef387aa09884.zip
op-kernel-dev-ac66f5477239ebd3c4e2cbf2f591ef387aa09884.tar.gz
sched/numa: Introduce migrate_swap()
Use the new stop_two_cpus() to implement migrate_swap(), a function that flips two tasks between their respective cpus. I'm fairly sure there's a less crude way than employing the stop_two_cpus() method, but everything I tried either got horribly fragile and/or complex. So keep it simple for now. The notable detail is how we 'migrate' tasks that aren't runnable anymore. We'll make it appear like we migrated them before they went to sleep. The sole difference is the previous cpu in the wakeup path, so we override this. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Link: http://lkml.kernel.org/r/1381141781-10992-39-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/idle_task.c')
-rw-r--r--kernel/sched/idle_task.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/idle_task.c b/kernel/sched/idle_task.c
index d8da010..516c3d9 100644
--- a/kernel/sched/idle_task.c
+++ b/kernel/sched/idle_task.c
@@ -9,7 +9,7 @@
#ifdef CONFIG_SMP
static int
-select_task_rq_idle(struct task_struct *p, int sd_flag, int flags)
+select_task_rq_idle(struct task_struct *p, int cpu, int sd_flag, int flags)
{
return task_cpu(p); /* IDLE tasks as never migrated */
}
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