| From | Andrea Arcangeli <> | Subject | [PATCH 15/39] autonuma: autonuma_enter/exit | Date | Mon, 26 Mar 2012 19:46:02 +0200 |
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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@redhat.com> --- 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; mmu_notifier_mm_init(mm); + autonuma_enter(mm); return mm; } @@ -572,6 +574,7 @@ 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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