(2013/08/30 10:33), HATAYAMA Daisuke wrote: > (2013/08/29 7:08), Cliff Wickman wrote: >> From: Cliff Wickman <cpw at 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. > > No. If I have good memory, Kumagai-san was investigating how to integrate > huge page filtering into current memory types currently supported by > makedumpfile. Yes, I was investigating it but I'm not working for it now. I think main features should work without vmlinux, but it was impossible about his patch as said by himself: > This patch depends on exporting the relevant PG_* flags from the > kernel (in VMCOREINFO), and that's where I got stuck, because depending > on the number of available bits for the page flags, the kernel either > has PG_head and PG_tail, or only PG_compound, so I needed a #ifdef, and > the kernel maintainers didn't like the conditional. > I can restart the discussion with kernel maintainers and see what I can do Therefore, I waited that his work is finished and I was going to continue my work, but I didn't say my thinking definitely, sorry. Anyway, I should cooperate with Petr to develop huge page filtering, so could you let me know the status of your work ? Thanks Atsushi Kumagai
