[PATCH 15/39] autonuma: autonuma_enter/exit

From: Andrea Arcangeli
Date: Mon Mar 26 2012 - 14:21:17 EST

The first gear in the whole AutoNUMA algorithm is knuma_scand. If
knuma_scand doesn't run AutoNUMA is a full bypass. If knuma_scand is
stopped, soon all other AutoNUMA gears will settle down too.

knuma_scand is the daemon that sets the pmd_numa and pte_numa and
allows the NUMA hinting page faults to start and then all other
actions follows as a reaction to that.

knuma_scand scans a list of "mm" and this is where we register and
unregister the "mm" into AutoNUMA for knuma_scand to scan them.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
kernel/fork.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index b9372a0..ba3b339 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -67,6 +67,7 @@
#include <linux/oom.h>
#include <linux/khugepaged.h>
#include <linux/signalfd.h>
+#include <linux/autonuma.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -505,6 +506,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p)
if (likely(!mm_alloc_pgd(mm))) {
mm->def_flags = 0;
+ autonuma_enter(mm);
return mm;

@@ -572,6 +574,7 @@ void mmput(struct mm_struct *mm)
khugepaged_exit(mm); /* must run before exit_mmap */
+ autonuma_exit(mm); /* must run before exit_mmap */
set_mm_exe_file(mm, NULL);
if (!list_empty(&mm->mmlist)) {
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