The patch titled
Subject: /proc/kpageflags: return KPF_BUDDY for "tail" buddy pages
has been added to the -mm tree. Its filename is
proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: /proc/kpageflags: return KPF_BUDDY for "tail" buddy pages
Currently /proc/kpageflags returns nothing for "tail" buddy pages, which
is inconvenient when grasping how free pages are distributed. This patch
sets KPF_BUDDY for such pages.
With this patch:
$ grep MemFree /proc/meminfo ; tools/vm/page-types -b buddy
MemFree: 3134992 kB
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000400 779272 3044 __________B_______________________________ buddy
0x0000000000000c00 4385 17 __________BM______________________________ buddy,mmap
total 783657 3061
783657 pages is 3134628 kB (roughly consistent with the global counter,)
so it's OK.
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 ++
include/linux/page-flags.h | 2 ++
mm/internal.h | 3 ---
mm/page_alloc.c | 2 --
4 files changed, 4 insertions(+), 5 deletions(-)
diff -puN fs/proc/page.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages fs/proc/page.c
--- a/fs/proc/page.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages
+++ a/fs/proc/page.c
@@ -148,6 +148,8 @@ u64 stable_page_flags(struct page *page)
*/
if (PageBuddy(page))
u |= 1 << KPF_BUDDY;
+ else if (page_count(page) == 0 && is_free_buddy_page(page))
+ u |= 1 << KPF_BUDDY;
if (PageBalloon(page))
u |= 1 << KPF_BALLOON;
diff -puN include/linux/page-flags.h~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages include/linux/page-flags.h
--- a/include/linux/page-flags.h~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages
+++ a/include/linux/page-flags.h
@@ -593,6 +593,8 @@ static inline void __ClearPageBuddy(stru
atomic_set(&page->_mapcount, -1);
}
+extern bool is_free_buddy_page(struct page *page);
+
#define PAGE_BALLOON_MAPCOUNT_VALUE (-256)
static inline int PageBalloon(struct page *page)
diff -puN mm/internal.h~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages mm/internal.h
--- a/mm/internal.h~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages
+++ a/mm/internal.h
@@ -153,9 +153,6 @@ extern int __isolate_free_page(struct pa
extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
unsigned int order);
extern void prep_compound_page(struct page *page, unsigned int order);
-#ifdef CONFIG_MEMORY_FAILURE
-extern bool is_free_buddy_page(struct page *page);
-#endif
extern int user_min_free_kbytes;
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
diff -puN mm/page_alloc.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages mm/page_alloc.c
--- a/mm/page_alloc.c~proc-kpageflags-return-kpf_buddy-for-tail-buddy-pages
+++ a/mm/page_alloc.c
@@ -7150,7 +7150,6 @@ __offline_isolated_pages(unsigned long s
}
#endif
-#ifdef CONFIG_MEMORY_FAILURE
bool is_free_buddy_page(struct page *page)
{
struct zone *zone = page_zone(page);
@@ -7169,4 +7168,3 @@ bool is_free_buddy_page(struct page *pag
return order < MAX_ORDER;
}
-#endif
_
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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