diff options
| author | Rik van Riel <riel@redhat.com> | 2013-10-07 11:29:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 14:48:12 +0200 |
| commit | dabe1d992414a6456e60e41f1d1ad8affc6d444d (patch) | |
| tree | 213b65fbc7864687d0ea9db96d7e768b6ff587cf /include/linux/sched.h | |
| parent | 0ec8aa00f2b4dc457836ef4e2662b02483e94fb7 (diff) | |
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/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 1127a46ac3d..59f953b2e41 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); |