Commit 83a08e7c authored Jan 08, 2008 by Ken'ichi Ohmichi Committed by Linus Torvalds Jan 08, 2008

vmcoreinfo: 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@intel.com>
Tested-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Acked-by: Simon Horman <horms@verge.net.au>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent caeeeecf

kernel/kexec.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1404,6 +1404,7 @@ static int __init crash_save_vmcoreinfo_init(void)
		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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