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From: "Wang, Yalin" <Yalin.Wang@sonymobile.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"'Konstantin Khlebnikov'" <koct9i@gmail.com>,
	"'akpm@linux-foundation.org'" <akpm@linux-foundation.org>,
	"'n-horiguchi@ah.jp.nec.com'" <n-horiguchi@ah.jp.nec.com>
Subject: [RFC] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
Date: Fri, 5 Dec 2014 16:57:38 +0800	[thread overview]
Message-ID: <35FD53F367049845BC99AC72306C23D103E688B313EE@CNBJMBX05.corpusers.net> (raw)

This patch add KPF_ZERO_PAGE flag for zero_page,
so that userspace process can notice zero_page from
/proc/kpageflags, and then do memory analysis more accurately.

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
---
 fs/proc/page.c                         | 3 +++
 include/uapi/linux/kernel-page-flags.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/fs/proc/page.c b/fs/proc/page.c
index 1e3187d..120dbf7 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -136,6 +136,9 @@ u64 stable_page_flags(struct page *page)
 	if (PageBalloon(page))
 		u |= 1 << KPF_BALLOON;
 
+	if (is_zero_pfn(page_to_pfn(page)))
+		u |= 1 << KPF_ZERO_PAGE;
+
 	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 2f96d23..a6c4962 100644
--- a/include/uapi/linux/kernel-page-flags.h
+++ b/include/uapi/linux/kernel-page-flags.h
@@ -32,6 +32,7 @@
 #define KPF_KSM			21
 #define KPF_THP			22
 #define KPF_BALLOON		23
+#define KPF_ZERO_PAGE		24
 
 
 #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
-- 
2.1.3

             reply	other threads:[~2014-12-05  8:57 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-05  8:57 Wang, Yalin [this message]
2014-12-05  9:20 ` [RFC] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags Konstantin Khlebnikov
2014-12-05 10:22   ` Wang, Yalin
2014-12-05 22:31     ` Andrew Morton
2014-12-08  2:00       ` [RFC V4] " Wang, Yalin
2014-12-08 11:46         ` Kirill A. Shutemov
2014-12-09  3:24           ` [RFC V5] " Wang, Yalin
2014-12-10  7:22             ` [RFC] mm:fix zero_page huge_zero_page rss/pss statistic Wang, Yalin
2014-12-10 11:05               ` Kirill A. Shutemov
2014-12-12  1:59                 ` Wang, Yalin
2014-12-12 11:10                   ` Kirill A. Shutemov
2014-12-10 17:06             ` [RFC V5] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags Konstantin Khlebnikov
2014-12-12  3:30               ` [RFC] discard task stack pages instead of pageout into swap partition Wang, Yalin
2014-12-18  3:50                 ` [RFC] MADV_FREE doesn't work when doesn't have " Wang, Yalin
2014-12-19  1:04                   ` Minchan Kim
2014-12-19  6:54                     ` Wang, Yalin
2014-12-22 10:30                     ` Konstantin Khlebnikov
2014-12-26 11:56                   ` [RFC] mm:change meminfo cached calculation Wang, Yalin
2015-01-07  0:43                     ` Andrew Morton
2015-01-07  1:04                       ` Hugh Dickins
2015-01-07  1:25                         ` Andrew Morton
2015-01-07  2:03                           ` Hugh Dickins
2015-01-11  8:23                             ` Konstantin Khlebnikov
2014-12-05 10:21 ` [RFC V2] mm:add KPF_ZERO_PAGE flag for /proc/kpageflags Wang, Yalin
2014-12-05 11:05   ` Kirill A. Shutemov
2014-12-08  1:51     ` [RFC V3] " Wang, Yalin
2014-12-08  7:47   ` [PATCH] mm:add VM_BUG_ON() for page_mapcount() Wang, Yalin
2014-12-08 11:50     ` Kirill A. Shutemov

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