linux-kernel - [PATCH 0/3] makedumpfile: hugepage filtering for vmcore dump

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Date:	Tue, 05 Nov 2013 21:45:32 +0800
From:	Jingbai Ma <jingbai.ma@...com>
To:	ptesarik@...e.cz, d.hatayama@...fujitsu.com,
	kumagai-atsushi@....nes.nec.co.jp
Cc:	bhe@...hat.com, tom.vaden@...com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, lisa.mitchell@...com,
	anderson@...hat.com, ebiederm@...ssion.com, vgoyal@...hat.com
Subject: [PATCH 0/3] makedumpfile: hugepage filtering for vmcore dump

This patch set intend to exclude unnecessary hugepages from vmcore dump file.

This patch requires the kernel patch to export necessary data structures into
vmcore: "kexec: export hugepage data structure into vmcoreinfo"
http://lists.infradead.org/pipermail/kexec/2013-November/009997.html

This patch introduce two new dump levels 32 and 64 to exclude all unused and
active hugepages. The level to exclude all unnecessary pages will be 127 now.

            |         cache    cache                    free    active
      Dump  |  zero   without  with     user    free    huge    huge
      Level |  page   private  private  data    page    page    page
     -------+----------------------------------------------------------
         0  |
         1  |   X
         2  |           X
         4  |           X        X
         8  |                            X
        16  |                                    X
        32  |                                            X
        64  |                                            X       X
       127  |   X       X        X       X       X       X       X

example:
To exclude all unnecessary pages:
makedumpfile -c --message-level 23 -d 127 /proc/vmcore /var/crash/kdump

To exclude all unnecessary pages but keep active hugepages:
makedumpfile -c --message-level 23 -d 63 /proc/vmcore /var/crash/kdump

---

Jingbai Ma (3):
      makedumpfile: hugepage filtering: add hugepage filtering functions
      makedumpfile: hugepage filtering: add excluding hugepage messages
      makedumpfile: hugepage filtering: add new dump levels for manual page


 makedumpfile.8 |  170 +++++++++++++++++++++++++++--------
 makedumpfile.c |  272 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 makedumpfile.h |   19 ++++
 print_info.c   |   12 +-
 print_info.h   |    2 
 5 files changed, 431 insertions(+), 44 deletions(-)

--

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