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cpusets, hotplug: Restructure functions that are invoked during hotplug

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Separate out the cpuset related handling for CPU/Memory online/offline.
This also helps us exploit the most obvious and basic level of optimization
that any notification mechanism (CPU/Mem online/offline) has to offer us:
"We *know* why we have been invoked. So stop pretending that we are lost,
and do only the necessary amount of processing!".

And while at it, rename scan_for_empty_cpusets() to
scan_cpusets_upon_hotplug(), which is more appropriate considering how
it is restructured.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120524141650.3692.48637.stgit@srivatsabhat.in.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Srivatsa S. Bhat
2012-05-24 19:46:55 +05:30
committed by Ingo Molnar
parent 80d1fa6463
commit 7ddf96b02f
3 changed files with 65 additions and 31 deletions
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4
kernel/sched/core.c
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@@ -7134,7 +7134,7 @@ static int cpuset_cpu_active(struct notifier_block *nfb, unsigned long action,
case CPU_ONLINE:
case CPU_DOWN_FAILED:
cpuset_update_active_cpus();
cpuset_update_active_cpus(true);
break;
default:
return NOTIFY_DONE;
@@ -7147,7 +7147,7 @@ static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action,
{
switch (action) {
case CPU_DOWN_PREPARE:
cpuset_update_active_cpus();
cpuset_update_active_cpus(false);
break;
case CPU_DOWN_PREPARE_FROZEN:
num_cpus_frozen++;