From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pz0-f49.google.com ([209.85.210.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1SkIgR-0005ZJ-O8 for kexec@lists.infradead.org; Thu, 28 Jun 2012 17:39:12 +0000 Received: by mail-pz0-f49.google.com with SMTP id m1so3477513dad.36 for ; Thu, 28 Jun 2012 10:39:11 -0700 (PDT) From: HATAYAMA Daisuke Subject: [RFC PATCH 09/10] Add page_is_buddy for PG_buddy Date: Fri, 29 Jun 2012 02:39:08 +0900 Message-ID: <20120628173908.19702.4363.stgit@fedora-machine> In-Reply-To: <20120628173757.19702.75678.stgit@fedora-machine> References: <20120628173757.19702.75678.stgit@fedora-machine> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: kumagai-atsushi@mxc.nes.nec.co.jp Cc: kexec@lists.infradead.org On kernels from v2.6.18 to v2.6.37, buddy page is marked by the PG_buddy flag. kernel version | PG_buddy ------------------ +--------------------------------- v2.6.17 to v2.6.26 | 19 v2.6.27 to v2.6.37 | 19 if CONFIG_PAGEFLAGS_EXTEND=y | 18 otherwise Note for hard coding: it's possible to determine whether CONFIG_PAGEFLAGS_EXTEND=yes or not by looking at error_status array defined in mm/memory-failure.c, for example. Signed-off-by: HATAYAMA Daisuke --- makedumpfile.c | 27 ++++++++++++++++++++------- 1 files changed, 20 insertions(+), 7 deletions(-) diff --git a/makedumpfile.c b/makedumpfile.c index aea956f..675b47e 100644 --- a/makedumpfile.c +++ b/makedumpfile.c @@ -3518,6 +3518,16 @@ exclude_free_page(void) } static int +page_is_buddy_v2(unsigned long flags, unsigned int _mapcount, + unsigned long private, unsigned int _count) +{ + if (flags & (1UL << NUMBER(PG_buddy))) + return TRUE; + + return FALSE; +} + +static int page_is_buddy_v3(unsigned long flags, unsigned int _mapcount, unsigned long private, unsigned int _count) { @@ -3533,13 +3543,16 @@ page_is_buddy_v3(unsigned long flags, unsigned int _mapcount, static void setup_page_is_buddy(void) { - if (NUMBER(PG_buddy) == NOT_FOUND_NUMBER - && SIZE(pageflags) != NOT_FOUND_STRUCTURE - && NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE) != NOT_FOUND_NUMBER) - info->page_is_buddy = page_is_buddy_v3; - - MSG("Can't select page_is_buddy handler; " - "filtering free pages is disabled.\n"); + if (NUMBER(PG_buddy) == NOT_FOUND_NUMBER) { + if (SIZE(pageflags) != NOT_FOUND_STRUCTURE + && NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE) != NOT_FOUND_NUMBER) + info->page_is_buddy = page_is_buddy_v3; + else { + MSG("Can't select page_is_buddy handler; " + "filtering free pages is disabled.\n"); + } + } else + info->page_is_buddy = page_is_buddy_v2; } /* _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec