sched/numa: Track from which nodes NUMA faults are triggered

Track which nodes NUMA faults are triggered from, in other words
the CPUs on which the NUMA faults happened. This uses a similar
mechanism to what is used to track the memory involved in numa faults.

The next patches use this to build up a bitmap of which nodes a
workload is actively running on.

Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-4-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 144d509df053..5fb0cfb43ecf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1480,6 +1480,13 @@ struct task_struct {
         unsigned long *numa_faults_buffer_memory;
 
         /*
+         * Track the nodes the process was running on when a NUMA hinting
+         * fault was incurred.
+         */
+        unsigned long *numa_faults_cpu;
+        unsigned long *numa_faults_buffer_cpu;
+
+        /*
          * numa_faults_locality tracks if faults recorded during the last
          * scan window were remote/local. The task scan period is adapted
          * based on the locality of the faults with different weights
@@ -1582,8 +1589,6 @@ extern void task_numa_fault(int last_node, int node, int pages, int flags);
 extern pid_t task_numa_group_id(struct task_struct *p);
 extern void set_numabalancing_state(bool enabled);
 extern void task_numa_free(struct task_struct *p);
-
-extern unsigned int sysctl_numa_balancing_migrate_deferred;
 #else
 static inline void task_numa_fault(int last_node, int node, int pages,
                                    int flags)