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authorPeter Zijlstra <peterz@infradead.org>2013-10-07 14:29:16 +0400
committerIngo Molnar <mingo@kernel.org>2013-10-09 14:40:46 +0400
commitac66f5477239ebd3c4e2cbf2f591ef387aa09884 (patch)
treed340545fa9235f4369c2bd50852fa3a2b7e807f1 /include/linux/sched.h
parent1be0bd77c5dd7c903f46abf52f9a3650face3c1d (diff)
downloadlinux-ac66f5477239ebd3c4e2cbf2f591ef387aa09884.tar.xz
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 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 14251a8ff2ea..b6619792bb13 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1043,6 +1043,8 @@ struct task_struct {
struct task_struct *last_wakee;
unsigned long wakee_flips;
unsigned long wakee_flip_decay_ts;
+
+ int wake_cpu;
#endif
int on_rq;