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Setting the numa_preferred_node for a task in task_numa_migrate does nothing on a 2-node system. Either we migrate to the node that already was our preferred node, or we stay where we were. On a 4-node system, it can slightly decrease overhead, by not calling the NUMA code as much. Since every node tends to be directly connected to every other node, running on the wrong node for a while does not do much damage. However, on an 8 node system, there are far more bad nodes than there are good ones, and pretending that a second choice is actually the preferred node can greatly delay, or even prevent, a workload from converging. The only time we can safely pretend that a second choice node is the preferred node is when the task is part of a workload that spans multiple NUMA nodes. Signed-off-by: Rik van Riel <riel@redhat.com> Tested-by: Vinod Chegu <chegu_vinod@hp.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1397235629-16328-4-git-send-email-riel@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| .. | ||
| auto_group.c | ||
| auto_group.h | ||
| clock.c | ||
| completion.c | ||
| core.c | ||
| cpuacct.c | ||
| cpuacct.h | ||
| cpudeadline.c | ||
| cpudeadline.h | ||
| cpupri.c | ||
| cpupri.h | ||
| cputime.c | ||
| deadline.c | ||
| debug.c | ||
| fair.c | ||
| features.h | ||
| idle_task.c | ||
| idle.c | ||
| Makefile | ||
| proc.c | ||
| rt.c | ||
| sched.h | ||
| stats.c | ||
| stats.h | ||
| stop_task.c | ||
| wait.c | ||