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    Subject[PATCH 15/39] autonuma: autonuma_enter/exit
    Date
    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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