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mm: numa: Revert temporarily disabling of NUMA migration

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With the scan rate code working (at least for multi-instance specjbb),
the large hammer that is "sched: Do not migrate memory immediately after
switching node" can be replaced with something smarter. Revert temporarily
migration disabling and all traces of numa_migrate_seq.

Signed-off-by: Rik van Riel <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Rik van Riel 2013-10-07 11:29:38 +01:00 • committed by Ingo Molnar
commit 1e3646ffc6
4 changed files with 1 additions and 39 deletions
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12
mm/mempolicy.c
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@ -2404,18 +2404,6 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
last_cpupid = page_cpupid_xchg_last(page, this_cpupid);
if (!cpupid_pid_unset(last_cpupid) && cpupid_to_nid(last_cpupid) != thisnid)
goto out;
#ifdef CONFIG_NUMA_BALANCING
/*
* If the scheduler has just moved us away from our
* preferred node, do not bother migrating pages yet.
* This way a short and temporary process migration will
* not cause excessive memory migration.
*/
if (thisnid != current->numa_preferred_nid &&
!current->numa_migrate_seq)
goto out;
#endif
}
if (curnid != polnid)