]> git.karo-electronics.de Git - linux-beck.git/commit
sched/numa: Introduce migrate_swap()
authorPeter Zijlstra <peterz@infradead.org>
Mon, 7 Oct 2013 10:29:16 +0000 (11:29 +0100)
committerIngo Molnar <mingo@kernel.org>
Wed, 9 Oct 2013 10:40:46 +0000 (12:40 +0200)
commitac66f5477239ebd3c4e2cbf2f591ef387aa09884
treed340545fa9235f4369c2bd50852fa3a2b7e807f1
parent1be0bd77c5dd7c903f46abf52f9a3650face3c1d
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>
include/linux/sched.h
kernel/sched/core.c
kernel/sched/fair.c
kernel/sched/idle_task.c
kernel/sched/rt.c
kernel/sched/sched.h
kernel/sched/stop_task.c