Re: A few patches to consider

HATAYAMA Daisuke
2013-09-19T02:13:26Z

(2013/09/18 12:00), Atsushi Kumagai wrote:
> (2013/08/30 10:33), HATAYAMA Daisuke wrote:
>> (2013/08/29 7:08), Cliff Wickman wrote:
>>> 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.
>>
>> 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 ?
>

To whom do you make this question? It seems Cliff according to content of this question.
If so you should resend. If to me, I have not done huge page filtering work at all so far
as I already said in the previous mail in this thread.

--
Thanks.
HATAYAMA, Daisuke