From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
To: kumagai-atsushi@mxc.nes.nec.co.jp
Cc: kexec@lists.infradead.org
Subject: [PATCH v2 08/10] Add page_is_buddy for PG_buddy
Date: Fri, 16 Nov 2012 14:02:13 +0900 [thread overview]
Message-ID: <20121116050213.8280.73020.stgit@localhost6.localdomain6> (raw)
In-Reply-To: <20121116050108.8280.14861.stgit@localhost6.localdomain6>
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
We don't need to care about CONFIG_PAGEFLAGS_EXTEND because the
architectures specifying this as y are um and xtensa only. They are
not included in the supported architectures of makedumpfile.
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
---
makedumpfile.c | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/makedumpfile.c b/makedumpfile.c
index 7b13dca..4e5d4d3 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -3669,6 +3669,19 @@ exclude_free_page(void)
}
/*
+ * For the kernel versions from v2.6.17 to v2.6.37.
+ */
+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;
+}
+
+/*
* For v2.6.38 and later kernel versions.
*/
static int
@@ -3690,10 +3703,13 @@ setup_page_is_buddy(void)
if (OFFSET(page.private) == NOT_FOUND_STRUCTURE)
goto out;
- if (NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE) != NOT_FOUND_NUMBER) {
- if (OFFSET(page._mapcount) != NOT_FOUND_STRUCTURE)
- info->page_is_buddy = page_is_buddy_v3;
- }
+ if (NUMBER(PG_buddy) == NOT_FOUND_NUMBER) {
+ if (NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE) != NOT_FOUND_NUMBER) {
+ if (OFFSET(page._mapcount) != NOT_FOUND_STRUCTURE)
+ info->page_is_buddy = page_is_buddy_v3;
+ }
+ } else
+ info->page_is_buddy = page_is_buddy_v2;
out:
if (!info->page_is_buddy)
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next prev parent reply other threads:[~2012-11-16 5:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-16 5:01 [PATCH v2 00/10] Support free page filtering looking up mem_map array HATAYAMA Daisuke
2012-11-16 5:01 ` [PATCH v2 01/10] Move page flags setup for old kernels after debuginfo initialization HATAYAMA Daisuke
2012-11-16 5:01 ` [PATCH v2 02/10] Add debuginfo interface for enum type size HATAYAMA Daisuke
2012-11-16 5:01 ` [PATCH v2 03/10] Add new parameters to various tables HATAYAMA Daisuke
2012-11-16 5:01 ` [PATCH v2 04/10] Add debuginfo-related processing for VMCOREINFO/VMLINUX HATAYAMA Daisuke
2012-11-16 5:01 ` [PATCH v2 05/10] Add hardcoded page flag values HATAYAMA Daisuke
2012-11-16 5:02 ` [PATCH v2 06/10] Exclude free pages by looking up mem_map array HATAYAMA Daisuke
2012-11-16 5:02 ` [PATCH v2 07/10] Add page_is_buddy for recent kernels HATAYAMA Daisuke
2012-11-16 5:02 ` HATAYAMA Daisuke [this message]
2012-11-27 6:00 ` [PATCH v2 08/10] Add page_is_buddy for PG_buddy Atsushi Kumagai
2012-11-27 7:30 ` Atsushi Kumagai
2012-11-27 8:53 ` Hatayama, Daisuke
2012-11-28 7:42 ` Atsushi Kumagai
2012-11-16 5:02 ` [PATCH v2 09/10] Add page_is_buddy for old kernels HATAYAMA Daisuke
2012-11-16 5:02 ` [PATCH v2 10/10] Warn cyclic buffer overrun and correct it if possible HATAYAMA Daisuke
2013-09-11 7:51 ` Atsushi Kumagai
2013-09-11 8:35 ` HATAYAMA Daisuke
2013-09-12 2:00 ` HATAYAMA Daisuke
2013-09-12 6:17 ` Atsushi Kumagai
2012-11-16 7:05 ` [PATCH v2 00/10] Support free page filtering looking up mem_map array Atsushi Kumagai
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