linux-kernel - [PATCH 5/5] Add the array length of "free

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Date:	Fri, 16 Nov 2007 11:33:26 +0900
From:	"Ken'ichi Ohmichi" <oomichi@....nes.nec.co.jp>
To:	lkml <linux-kernel@...r.kernel.org>,
	kexec-ml <kexec@...ts.infradead.org>
Subject: [PATCH 5/5] Add the array length of "free_list" for filtering free
 pages

This patch adds the array length of "free_area.free_list" to the vmcoreinfo
data so that makedumpfile (dump filtering command) can exclude all free pages
in linux-2.6.24.

makedumpfile creates a small dumpfile by excluding unnecessary pages for the
analysis. To distinguish unnecessary pages, makedumpfile gets the vmcoreinfo
data which has the minimum debugging information only for dump filtering.

In 2.6.24-rc1 or later, the free_area.free_list is an array which has one list
for each migrate types instead of a single list. makedumpfile needs the array
length of "free_area.free_list" and the vmcoreinfo data should contain it.

Signed-off-by: Huang Ying <ying.huang@...el.com>
Tested-by: Ken'ichi Ohmichi <oomichi@....nes.nec.co.jp>
---
diff -rpuN a/kernel/kexec.c b/kernel/kexec.c
--- a/kernel/kexec.c	2007-11-12 11:15:26.000000000 +0900
+++ b/kernel/kexec.c	2007-11-12 11:16:09.000000000 +0900
@@ -1404,6 +1404,7 @@ static int __init crash_save_vmcoreinfo_
 	VMCOREINFO_OFFSET(list_head, next);
 	VMCOREINFO_OFFSET(list_head, prev);
 	VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+	VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
 	VMCOREINFO_NUMBER(NR_FREE_PAGES);

 	arch_crash_save_vmcoreinfo();
_

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