The patch titled
Subject: proc: kpageflags: do not report buddy and balloon pages as mapped
has been added to the -mm tree. Its filename is
proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix.patch
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: proc: kpageflags: do not report buddy and balloon pages as mapped
PageBuddy and PageBalloon are not usual page flags - they are identified
by a special negative (so as not to confuse with mapped pages) value of
page->_mapcount. Since /proc/kpageflags uses page_mapcount helper to
check if a page is mapped, it reports pages of these kinds as being
mapped, which is confusing. Fix that by replacing page_mapcount with
page_mapped.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/page.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN fs/proc/page.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix fs/proc/page.c
--- a/fs/proc/page.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix
+++ a/fs/proc/page.c
@@ -105,7 +105,7 @@ u64 stable_page_flags(struct page *page)
* Note that page->_mapcount is overloaded in SLOB/SLUB/SLQB, so the
* simple test in page_mapcount() is not enough.
*/
- if (!PageSlab(page) && page_mapcount(page))
+ if (!PageSlab(page) && page_mapped(page))
u |= 1 << KPF_MMAP;
if (PageAnon(page))
u |= 1 << KPF_ANON;
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
mm-vmscan-do-not-clear-shrinker_numa_aware-if-nr_node_ids-==-1.patch
mm-migrate-do-not-touch-page-mem_cgroup-of-live-pages-fix-2.patch
mm-memcontrol-do-not-bypass-slab-charge-if-memcg-is-offline.patch
mm-memcontrol-make-tree_statevents-fetch-all-stats.patch
mm-memcontrol-report-slab-usage-in-cgroup2-memorystat.patch
mm-memcontrol-report-kernel-stack-usage-in-cgroup2-memorystat.patch
proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages-fix.patch
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