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 <alexander.h.duyck@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Liang Li <liliang324@xxxxxxxxx>
Signed-off-by: Liang Li <liliangleo@xxxxxxxxxxxxxx>
---
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
