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| author | Mel Gorman <mgorman@suse.de> | 2013-10-07 11:28:53 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 12:40:17 +0200 |
| commit | b726b7dfb400c937546fa91cf8523dcb1aa2fc6e (patch) | |
| tree | b4a6f741b630bb22568536860f3f46e94c4e8904 /kernel/fork.c | |
| parent | 9e645ab6d089f5822479a833c6977c785bcfffe3 (diff) | |
| download | lwn-b726b7dfb400c937546fa91cf8523dcb1aa2fc6e.tar.gz lwn-b726b7dfb400c937546fa91cf8523dcb1aa2fc6e.zip | |
Revert "mm: sched: numa: Delay PTE scanning until a task is scheduled on a new node"
PTE scanning and NUMA hinting fault handling is expensive so commit
5bca2303 ("mm: sched: numa: Delay PTE scanning until a task is scheduled
on a new node") deferred the PTE scan until a task had been scheduled on
another node. The problem is that in the purely shared memory case that
this may never happen and no NUMA hinting fault information will be
captured. We are not ruling out the possibility that something better
can be done here but for now, this patch needs to be reverted and depend
entirely on the scan_delay to avoid punishing short-lived processes.
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/1381141781-10992-16-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 086fe73ad6bd..7192d91b5415 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -817,9 +817,6 @@ struct mm_struct *dup_mm(struct task_struct *tsk) #ifdef CONFIG_TRANSPARENT_HUGEPAGE mm->pmd_huge_pte = NULL; #endif -#ifdef CONFIG_NUMA_BALANCING - mm->first_nid = NUMA_PTE_SCAN_INIT; -#endif if (!mm_init(mm, tsk)) goto fail_nomem; |