Commit-ID: 9ff1d9ff3c2c8ab3feaeb2e8056a07ca293f7bde Gitweb: http://git.kernel.org/tip/9ff1d9ff3c2c8ab3feaeb2e8056a07ca293f7bde Author: Mel Gorman <mgorman@xxxxxxx> AuthorDate: Mon, 7 Oct 2013 11:29:04 +0100 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 9 Oct 2013 12:40:31 +0200 sched/numa: Check current->mm before allocating NUMA faults task_numa_placement checks current->mm but after buffers for faults have already been uselessly allocated. Move the check earlier. [peterz@xxxxxxxxxxxxx: Identified the problem] Signed-off-by: Mel Gorman <mgorman@xxxxxxx> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1381141781-10992-27-git-send-email-mgorman@xxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/fair.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 89eeb89..3383079 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -930,8 +930,6 @@ static void task_numa_placement(struct task_struct *p) int seq, nid, max_nid = -1; unsigned long max_faults = 0; - if (!p->mm) /* for example, ksmd faulting in a user's mm */ - return; seq = ACCESS_ONCE(p->mm->numa_scan_seq); if (p->numa_scan_seq == seq) return; @@ -998,6 +996,10 @@ void task_numa_fault(int last_nid, int node, int pages, bool migrated) if (!numabalancing_enabled) return; + /* for example, ksmd faulting in a user's mm */ + if (!p->mm) + return; + /* For now, do not attempt to detect private/shared accesses */ priv = 1; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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