This patch add support of pre zero out free hugepage, we can use this feature to speed up page population and page fault handing.
Cc: Alexander Duyck <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Dan Williams <[email protected]> Cc: Dave Hansen <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Alex Williamson <[email protected]> Cc: Michael S. Tsirkin <[email protected]> Cc: Jason Wang <[email protected]> Cc: Mike Kravetz <[email protected]> Cc: Liang Li <[email protected]> Signed-off-by: Liang Li <[email protected]> --- mm/page_prezero.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/mm/page_prezero.c b/mm/page_prezero.c index c8ce720bfc54..dff4e0adf402 100644 --- a/mm/page_prezero.c +++ b/mm/page_prezero.c @@ -26,6 +26,7 @@ static unsigned long delay_millisecs = 1000; static unsigned long zeropage_enable __read_mostly; static DEFINE_MUTEX(kzeropaged_mutex); static struct page_reporting_dev_info zero_page_dev_info; +static struct page_reporting_dev_info zero_hugepage_dev_info; inline void clear_zero_page_flag(struct page *page, int order) { @@ -69,9 +70,17 @@ static int start_kzeropaged(void) zero_page_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); err = page_reporting_register(&zero_page_dev_info); + + zero_hugepage_dev_info.report = zero_free_pages; + zero_hugepage_dev_info.mini_order = mini_page_order; + zero_hugepage_dev_info.batch_size = batch_size; + zero_hugepage_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + + err |= hugepage_reporting_register(&zero_hugepage_dev_info); pr_info("Zero page enabled\n"); } else { page_reporting_unregister(&zero_page_dev_info); + hugepage_reporting_unregister(&zero_hugepage_dev_info); pr_info("Zero page disabled\n"); } @@ -90,7 +99,15 @@ static int restart_kzeropaged(void) zero_page_dev_info.batch_size = batch_size; zero_page_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + hugepage_reporting_unregister(&zero_hugepage_dev_info); + + zero_hugepage_dev_info.report = zero_free_pages; + zero_hugepage_dev_info.mini_order = mini_page_order; + zero_hugepage_dev_info.batch_size = batch_size; + zero_hugepage_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + err = page_reporting_register(&zero_page_dev_info); + err |= hugepage_reporting_register(&zero_hugepage_dev_info); pr_info("Zero page enabled\n"); } -- 2.18.2
