diff options
| author | Mel Gorman <mgorman@suse.de> | 2013-10-07 10:28:57 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 10:40:22 (GMT) |
| commit | f809ca9a554dda49fb264c79e31c722e0b063ff8 (patch) | |
| tree | dbb0307d8d16c26421c1a08fc11e4bbff1d48f85 /kernel/sched/fair.c | |
| parent | f307cd1a32fab53012b01749a1f5ba10b0a7243f (diff) | |
| download | linux-f809ca9a554dda49fb264c79e31c722e0b063ff8.tar.xz | |
sched/numa: Track NUMA hinting faults on per-node basis
This patch tracks what nodes numa hinting faults were incurred on.
This information is later used to schedule a task on the node storing
the pages most frequently faulted by the task.
Signed-off-by: Mel Gorman <mgorman@suse.de>
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: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-20-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c6c3302..0bb3e0a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -902,7 +902,14 @@ void task_numa_fault(int node, int pages, bool migrated) if (!numabalancing_enabled) return; - /* FIXME: Allocate task-specific structure for placement policy here */ + /* Allocate buffer to track faults on a per-node basis */ + if (unlikely(!p->numa_faults)) { + int size = sizeof(*p->numa_faults) * nr_node_ids; + + p->numa_faults = kzalloc(size, GFP_KERNEL|__GFP_NOWARN); + if (!p->numa_faults) + return; + } /* * If pages are properly placed (did not migrate) then scan slower. @@ -918,6 +925,8 @@ void task_numa_fault(int node, int pages, bool migrated) } task_numa_placement(p); + + p->numa_faults[node] += pages; } static void reset_ptenuma_scan(struct task_struct *p) |