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-rw-r--r--Documentation/vm/pagemap.txt7
-rw-r--r--fs/proc/page.c3
-rw-r--r--include/uapi/linux/kernel-page-flags.h1
3 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
index ce294b0aace4..0e1e55588b59 100644
--- a/Documentation/vm/pagemap.txt
+++ b/Documentation/vm/pagemap.txt
@@ -70,6 +70,7 @@ There are four components to pagemap:
22. THP
23. BALLOON
24. ZERO_PAGE
+ 25. IDLE
* /proc/kpagecgroup. This file contains a 64-bit inode number of the
memory cgroup each page is charged to, indexed by PFN. Only available when
@@ -120,6 +121,12 @@ Short descriptions to the page flags:
24. ZERO_PAGE
zero page for pfn_zero or huge_zero page
+25. IDLE
+ page has not been accessed since it was marked idle (see
+ Documentation/vm/idle_page_tracking.txt). Note that this flag may be
+ stale in case the page was accessed via a PTE. To make sure the flag
+ is up-to-date one has to read /sys/kernel/mm/page_idle/bitmap first.
+
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data
diff --git a/fs/proc/page.c b/fs/proc/page.c
index c2d29edcaa6b..0b8286450a93 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -150,6 +150,9 @@ u64 stable_page_flags(struct page *page)
if (PageBalloon(page))
u |= 1 << KPF_BALLOON;
+ if (page_is_idle(page))
+ u |= 1 << KPF_IDLE;
+
u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked);
u |= kpf_copy_bit(k, KPF_SLAB, PG_slab);
diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h
index a6c4962e5d46..5da5f8751ce7 100644
--- a/include/uapi/linux/kernel-page-flags.h
+++ b/include/uapi/linux/kernel-page-flags.h
@@ -33,6 +33,7 @@
#define KPF_THP 22
#define KPF_BALLOON 23
#define KPF_ZERO_PAGE 24
+#define KPF_IDLE 25
#endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */