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authorRik van Riel <riel@redhat.com>2013-10-07 14:29:34 +0400
committerIngo Molnar <mingo@kernel.org>2013-10-09 16:48:12 +0400
commitdabe1d992414a6456e60e41f1d1ad8affc6d444d (patch)
tree213b65fbc7864687d0ea9db96d7e768b6ff587cf /include
parent0ec8aa00f2b4dc457836ef4e2662b02483e94fb7 (diff)
downloadlinux-dabe1d992414a6456e60e41f1d1ad8affc6d444d.tar.xz
sched/numa: Be more careful about joining numa groups
Due to the way the pid is truncated, and tasks are moved between CPUs by the scheduler, it is possible for the current task_numa_fault to group together tasks that do not actually share memory together. This patch adds a few easy sanity checks to task_numa_fault, joining tasks together if they share the same tsk->mm, or if the fault was on a page with an elevated mapcount, in a shared VMA. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Mel Gorman <mgorman@suse.de> 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/1381141781-10992-57-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1127a46ac3d2..59f953b2e413 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1454,6 +1454,7 @@ struct task_struct {
#define TNF_MIGRATED 0x01
#define TNF_NO_GROUP 0x02
+#define TNF_SHARED 0x04
#ifdef CONFIG_NUMA_BALANCING
extern void task_numa_fault(int last_node, int node, int pages, int flags);