The patch titled
Subject: mm/page_idle.c: Skip offline pages
has been added to the -mm tree. Its filename is
mm-page_idlec-skip-offline-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_idlec-skip-offline-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_idlec-skip-offline-pages.patch
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------------------------------------------------------
From: SeongJae Park <sjpark@xxxxxxxxx>
Subject: mm/page_idle.c: Skip offline pages
'Idle page tracking' users can pass random pfn that might be mapped to an
offline page. To avoid accessing such pages, this commit modifies the
'page_idle_get_page()' to use 'pfn_to_online_page()' instead of
'pfn_valid()' and 'pfn_to_page()' combination, so that the pfn mapped to
an offline page can be skipped.
Link: http://lkml.kernel.org/r/20200605092502.18018-2-sjpark@xxxxxxxxxx
Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx>
Reported-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_idle.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
--- a/mm/page_idle.c~mm-page_idlec-skip-offline-pages
+++ a/mm/page_idle.c
@@ -4,6 +4,7 @@
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
+#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
@@ -30,13 +31,9 @@
*/
static struct page *page_idle_get_page(unsigned long pfn)
{
- struct page *page;
+ struct page *page = pfn_to_online_page(pfn);
pg_data_t *pgdat;
- if (!pfn_valid(pfn))
- return NULL;
-
- page = pfn_to_page(pfn);
if (!page || !PageLRU(page) ||
!get_page_unless_zero(page))
return NULL;
_
Patches currently in -mm which might be from sjpark@xxxxxxxxx are
scripts-spelling-add-a-few-more-typos.patch
mm-page_idlec-skip-offline-pages.patch
mm-page_idlec-skip-offline-pages.patch
