A few patches to consider

Cliff Wickman
2013-08-28T22:08:34Z

From: Cliff Wickman <cpw@sgi.com>

I am submitting 6 patches that I have found helpful in speeding the dump
process or clarifying the progress report.
They are not a series, and should not be interdependent. But if you
find any dependencies I apply them in this order:
[PATCH] makedumpfile: reverse -c and -p if using snappy compression
[PATCH] makedumpfile: use non-cyclic when possible
[PATCH] makedumpfile: shorten cyclic exclude-unnecessary passes
[PATCH] makedumpfile: shorten cyclic unnecessary-page scans
[PATCH] makedumpfile: show needed memory
[PATCH] makedumpfile: search for a debug vmlinux

The last one (search for a debug vmlinux) is useful in identifying huge
pages with the PG_head/PG-tail flags. There was a patch from Petr Tesarik
that enables that huge page filtering. I don't think you are taking that one
as-is, but are reworking it. Seems like Hatayama-san was doing that work.
That one is very important and I need to include Petr's version in any
makedumpfile that we use in a very large system. I hope that one is coming
along for inclusion in the next release.

-Cliff Wickman