linux-kernel - Re: [PATCH v5 09/16] kexec: enable KHO support for memory preservation

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Message-ID: <mafs0a58yqu03.fsf_-_@amazon.de>
Date: Wed, 2 Apr 2025 18:49:00 +0000
From: Pratyush Yadav <ptyadav@...zon.de>
To: Pasha Tatashin <pasha.tatashin@...een.com>
CC: Changyuan Lyu <changyuanl@...gle.com>, <akpm@...ux-foundation.org>,
	<anthony.yznaga@...cle.com>, <arnd@...db.de>, <ashish.kalra@....com>,
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	<corbet@....net>, <dave.hansen@...ux.intel.com>,
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	<graf@...zon.com>, <hpa@...or.com>, <jgg@...dia.com>, <jgowans@...zon.com>,
	<kexec@...ts.infradead.org>, <krzk@...nel.org>,
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Subject: Re: [PATCH v5 09/16] kexec: enable KHO support for memory preservation

On Wed, Apr 02 2025, Pasha Tatashin wrote:

> On Wed, Apr 2, 2025 at 12:47 PM Pratyush Yadav <ptyadav@...zon.de> wrote:
>>
>> Hi,
>>
>> On Wed, Apr 02 2025, Changyuan Lyu wrote:
>>
>> > Hi Pratyush, Thanks for suggestions!
>> >
>> > On Thu, Mar 27, 2025 at 17:28:40 +0000, Pratyush Yadav <ptyadav@...zon.de> wrote:
[...]
>> >>
>> >> The memblock_reserve side we can optimize later, I agree. But the memory
>> >> preservation format is ABI and I think that is worth spending a little
>> >> more time on. And I don't think it should be that much more complex than
>> >> the current format.
>> >>
>> >> I want to hack around with it, so I'll give it a try over the next few
>> >> days and see what I can come up with.
>> >
>> > I agree with Jason that "nothing is ABI at this
>> > point" and it will take some time for KHO to stabilize.
>> >
>> > On the other hand if you have already came up with something working and
>> > simple, we can include it in the next version.
>>
>> I already have something that works with zero-order pages. I am
>> currently implementing support for other orders. It is almost done, but
>> I need to test it and do a performance comparison with the current
>> patch. Will post something soon!
>
> Hi Pratyush,
>
> Just to clarify, how soon? We are about to post v6 for KHO, with all
> other comments in this thread addressed.

I have it working, but I need to clean up the code a bit and test it
better. So hopefully end of this week or early next week.

-- 
Regards,
Pratyush Yadav