lkml.org 
[lkml]   [2021]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 2/5] mm/hugetlb: optimize the surplus state transfer code in move_hugetlb_state()
    Date
    We should not transfer the per-node surplus state when we do not cross the
    node in order to save some cpu cycles

    Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
    Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
    ---
    mm/hugetlb.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/mm/hugetlb.c b/mm/hugetlb.c
    index 33a3edf79022..695603071f2c 100644
    --- a/mm/hugetlb.c
    +++ b/mm/hugetlb.c
    @@ -5621,6 +5621,12 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason)
    SetHPageTemporary(oldpage);
    ClearHPageTemporary(newpage);

    + /*
    + * There is no need to transfer the per-node surplus state
    + * when we do not cross the node.
    + */
    + if (new_nid == old_nid)
    + return;
    spin_lock(&hugetlb_lock);
    if (h->surplus_huge_pages_node[old_nid]) {
    h->surplus_huge_pages_node[old_nid]--;
    --
    2.19.1
    \
     
     \ /
      Last update: 2021-03-08 12:30    [W:3.984 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site