This is where we register (and unregister) an "mm" structure into
AutoNUMA for knuma_scand to scan them.
knuma_scand is the first gear in the whole AutoNUMA algorithm.
knuma_scand is the daemon that scans the "mm" structures in the list
and sets pmd_numa and pte_numa to allow the NUMA hinting page faults
to start. All other actions follow after that. If knuma_scand doesn't
run, AutoNUMA is fully bypassed. If knuma_scand is stopped, soon all
other AutoNUMA gears will settle down too.
Acked-by: Rik van Riel <r...@redhat.com>
Signed-off-by: Andrea Arcangeli <aarca...@redhat.com>
---
kernel/fork.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index f998e53..fbc67ee 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -70,6 +70,7 @@
#include <linux/khugepaged.h>
#include <linux/signalfd.h>
#include <linux/uprobes.h>
+#include <linux/autonuma.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -541,6 +542,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm,
struct task_struct *p)
if (likely(!mm_alloc_pgd(mm))) {
mm->def_flags = 0;
mmu_notifier_mm_init(mm);
+ autonuma_enter(mm);
return mm;
}
@@ -609,6 +611,7 @@ void mmput(struct mm_struct *mm)
exit_aio(mm);
ksm_exit(mm);
khugepaged_exit(mm); /* must run before exit_mmap */
+ autonuma_exit(mm); /* must run before exit_mmap */
exit_mmap(mm);
set_mm_exe_file(mm, NULL);
if (!list_empty(&mm->mmlist)) {
--
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