mm: numa: Change page last {nid,pid} into {cpu,pid}
Change the per page last fault tracking to use cpu,pid instead of
nid,pid. This will allow us to try and lookup the alternate task more
easily. Note that even though it is the cpu that is store in the page
flags that the mpol_misplaced decision is still based on the node.
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/1381141781-10992-43-git-send-email-mgorman@suse.de
[ Fixed build failure on 32-bit systems. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index aa561c8..dbe0f62 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1210,7 +1210,7 @@
/*
* Got a PROT_NONE fault for a page on @node.
*/
-void task_numa_fault(int last_nidpid, int node, int pages, bool migrated)
+void task_numa_fault(int last_cpupid, int node, int pages, bool migrated)
{
struct task_struct *p = current;
int priv;
@@ -1226,8 +1226,8 @@
* First accesses are treated as private, otherwise consider accesses
* to be private if the accessing pid has not changed
*/
- if (!nidpid_pid_unset(last_nidpid))
- priv = ((p->pid & LAST__PID_MASK) == nidpid_to_pid(last_nidpid));
+ if (!cpupid_pid_unset(last_cpupid))
+ priv = ((p->pid & LAST__PID_MASK) == cpupid_to_pid(last_cpupid));
else
priv = 1;