The patch titled
Subject: /proc/kpageflags: return KPF_SLAB for slab tail pages
has been added to the -mm tree. Its filename is
proc-kpageflags-return-kpf_slab-for-slab-tail-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-kpageflags-return-kpf_slab-for-slab-tail-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-kpageflags-return-kpf_slab-for-slab-tail-pages.patch
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: /proc/kpageflags: return KPF_SLAB for slab tail pages
Currently /proc/kpageflags returns just KPF_COMPOUND_TAIL for slab tail
pages, which is inconvenient when grasping how slab pages are distributed
(userspace always needs to check which kind of tail pages by itself).
This patch sets KPF_SLAB for such pages.
With this patch:
$ grep Slab /proc/meminfo ; tools/vm/page-types -b slab
Slab: 64880 kB
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000080 16220 63 _______S__________________________________ slab
total 16220 63
16220 pages equals to 64880 kB, so returned result is consistent with the
global counter.
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/page.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/proc/page.c~proc-kpageflags-return-kpf_slab-for-slab-tail-pages fs/proc/page.c
--- a/fs/proc/page.c~proc-kpageflags-return-kpf_slab-for-slab-tail-pages
+++ a/fs/proc/page.c
@@ -160,6 +160,8 @@ u64 stable_page_flags(struct page *page)
u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked);
u |= kpf_copy_bit(k, KPF_SLAB, PG_slab);
+ if (PageTail(page) && PageSlab(compound_head(page)))
+ u |= 1 << KPF_SLAB;
u |= kpf_copy_bit(k, KPF_ERROR, PG_error);
u |= kpf_copy_bit(k, KPF_DIRTY, PG_dirty);
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-madvise-pass-return-code-of-memory_failure-to-userspace.patch
mm-madvise-update-comment-on-sys_madvise.patch
proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages.patch
proc-kpageflags-return-kpf_slab-for-slab-tail-pages.patch
tools-vm-page-typesc-support-swap-entry.patch
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