proc: export idle flag via kpageflags

As noted by Minchan, a benefit of reading idle flag from /proc/kpageflags
is that one can easily filter dirty and/or unevictable pages while
estimating the size of unused memory.

Note that idle flag read from /proc/kpageflags may be stale in case the
page was accessed via a PTE, because it would be too costly to iterate
over all page mappings on each /proc/kpageflags read to provide an
up-to-date value.  To make sure the flag is up-to-date one has to read
/sys/kernel/mm/page_idle/bitmap first.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Reviewed-by: Andres Lagar-Cavilla <andreslc@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
index ce294b0aace49297a188b1419c412b5669312a96..0e1e55588b598b45a60e3e476bad0dc8a9a53266 100644 (file)
--- 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 c2d29edcaa6bd131269cb8428ecd96183ed8324d..0b8286450a939b3cb6e1dc4dc282a9155970baad 100644 (file)
--- 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 a6c4962e5d4623912adb21f4c240b352de223481..5da5f8751ce7dc082a4a99cfe29e7d2eb7f6ba5a 100644 (file)
--- 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 */