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| author | Peter Zijlstra <peterz@infradead.org> | 2013-10-07 12:29:21 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 14:47:47 +0200 |
| commit | 8c8a743c5087bac9caac8155b8f3b367e75cdd0b (patch) | |
| tree | d5cc5c5f4368cf7d3deb627388c869dbea2e83f2 /kernel/sched/sched.h | |
| parent | mm: numa: Change page last {nid,pid} into {cpu,pid} (diff) | |
| download | linux-8c8a743c5087bac9caac8155b8f3b367e75cdd0b.tar.xz linux-8c8a743c5087bac9caac8155b8f3b367e75cdd0b.zip | |
sched/numa: Use {cpu, pid} to create task groups for shared faults
While parallel applications tend to align their data on the cache
boundary, they tend not to align on the page or THP boundary.
Consequently tasks that partition their data can still "false-share"
pages presenting a problem for optimal NUMA placement.
This patch uses NUMA hinting faults to chain tasks together into
numa_groups. As well as storing the NID a task was running on when
accessing a page a truncated representation of the faulting PID is
stored. If subsequent faults are from different PIDs it is reasonable
to assume that those two tasks share a page and are candidates for
being grouped together. Note that this patch makes no scheduling
decisions based on the grouping information.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
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>
Link: http://lkml.kernel.org/r/1381141781-10992-44-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 691e96964dcc..8037b10a256f 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -559,10 +559,7 @@ static inline u64 rq_clock_task(struct rq *rq) #ifdef CONFIG_NUMA_BALANCING extern int migrate_task_to(struct task_struct *p, int cpu); extern int migrate_swap(struct task_struct *, struct task_struct *); -static inline void task_numa_free(struct task_struct *p) -{ - kfree(p->numa_faults); -} +extern void task_numa_free(struct task_struct *p); #else /* CONFIG_NUMA_BALANCING */ static inline void task_numa_free(struct task_struct *p) { |