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numa: add a sysctl for numa_balancing

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Add a working sysctl to enable/disable automatic numa memory balancing
at runtime.

This allows us to track down performance problems with this feature and
is generally a good idea.

This was possible earlier through debugfs, but only with special
debugging options set.  Also fix the boot message.

[[email protected]: s/sched_numa_balancing/sysctl_numa_balancing/]
Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andi Kleen 2014-01-23 15:53:13 -08:00 • committed by Linus Torvalds
commit 54a43d5498
4 changed files with 37 additions and 2 deletions
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2
mm/mempolicy.c
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@ -2668,7 +2668,7 @@ static void __init check_numabalancing_enable(void)
if (nr_node_ids > 1 && !numabalancing_override) {
printk(KERN_INFO "Enabling automatic NUMA balancing. "
"Configure with numa_balancing= or sysctl");
"Configure with numa_balancing= or the kernel.numa_balancing sysctl");
set_numabalancing_state(numabalancing_default);
}
}