From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx146.postini.com [74.125.245.146]) by kanga.kvack.org (Postfix) with SMTP id 6252E6B005C for ; Fri, 27 Jan 2012 18:01:55 -0500 (EST) From: Naoya Horiguchi Subject: [PATCH 3/6] pagemap: export KPF_THP Date: Fri, 27 Jan 2012 18:02:50 -0500 Message-Id: <1327705373-29395-4-git-send-email-n-horiguchi@ah.jp.nec.com> In-Reply-To: <1327705373-29395-1-git-send-email-n-horiguchi@ah.jp.nec.com> References: <1327705373-29395-1-git-send-email-n-horiguchi@ah.jp.nec.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Andrew Morton , David Rientjes , Andi Kleen , Wu Fengguang , Andrea Arcangeli , KOSAKI Motohiro , KAMEZAWA Hiroyuki , linux-kernel@vger.kernel.org, Naoya Horiguchi This flag shows that a given pages is a subpage of transparent hugepage. It helps us debug and test kernel by showing physical address of thp. Signed-off-by: Naoya Horiguchi Reviewed-by: Wu Fengguang Reviewed-by: KAMEZAWA Hiroyuki Acked-by: KOSAKI Motohiro Changes since v2: - replace if with else-if not to set KPF_THP for hugetlbfs page Changes since v1: - remove unnecessary ifdefs - fix confusing patch description --- fs/proc/page.c | 2 ++ include/linux/kernel-page-flags.h | 1 + 2 files changed, 3 insertions(+), 0 deletions(-) diff --git 3.3-rc1.orig/fs/proc/page.c 3.3-rc1/fs/proc/page.c index 6d8e6a9..7fcd0d6 100644 --- 3.3-rc1.orig/fs/proc/page.c +++ 3.3-rc1/fs/proc/page.c @@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; + else if (PageTransCompound(page)) + u |= 1 << KPF_THP; /* * Caveats on high order pages: page->_count will only be set diff --git 3.3-rc1.orig/include/linux/kernel-page-flags.h 3.3-rc1/include/linux/kernel-page-flags.h index bd92a89..26a6571 100644 --- 3.3-rc1.orig/include/linux/kernel-page-flags.h +++ 3.3-rc1/include/linux/kernel-page-flags.h @@ -30,6 +30,7 @@ #define KPF_NOPAGE 20 #define KPF_KSM 21 +#define KPF_THP 22 /* kernel hacking assistances * WARNING: subject to change, never rely on them! -- 1.7.7.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org