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mm: numa: Do not group on RO pages

Browse source 
And here's a little something to make sure not the whole world ends up
in a single group.

As while we don't migrate shared executable pages, we do scan/fault on
them. And since everybody links to libc, everybody ends up in the same
group.

Suggested-by: Rik van Riel <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2013-10-07 11:29:24 +01:00 • committed by Ingo Molnar
commit 6688cc0547
4 changed files with 47 additions and 10 deletions
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5
kernel/sched/fair.c
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@ -1361,9 +1361,10 @@ void task_numa_free(struct task_struct *p)
/*
* Got a PROT_NONE fault for a page on @node.
*/
void task_numa_fault(int last_cpupid, int node, int pages, bool migrated)
void task_numa_fault(int last_cpupid, int node, int pages, int flags)
{
struct task_struct *p = current;
bool migrated = flags & TNF_MIGRATED;
int priv;
if (!numabalancing_enabled)
@ -1394,7 +1395,7 @@ void task_numa_fault(int last_cpupid, int node, int pages, bool migrated)
priv = 1;
} else {
priv = cpupid_match_pid(p, last_cpupid);
if (!priv)
if (!priv && !(flags & TNF_NO_GROUP))
task_numa_group(p, last_cpupid);
}