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Wed, 2 Apr 2025 18:49:01 +0000 Received: from dev-dsk-ptyadav-1c-43206220.eu-west-1.amazon.com (dev-dsk-ptyadav-1c-43206220.eu-west-1.amazon.com [172.19.91.144]) by email-imr-corp-prod-iad-all-1b-85daddd1.us-east-1.amazon.com (Postfix) with ESMTP id B8E254076F; Wed, 2 Apr 2025 18:49:00 +0000 (UTC) Received: by dev-dsk-ptyadav-1c-43206220.eu-west-1.amazon.com (Postfix, from userid 23027615) id 74DA54F1C; Wed, 2 Apr 2025 18:49:00 +0000 (UTC) From: Pratyush Yadav To: Pasha Tatashin CC: Changyuan Lyu , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v5 09/16] kexec: enable KHO support for memory preservation In-Reply-To: References: <20250402164453.2470750-1-changyuanl@google.com> Date: Wed, 2 Apr 2025 18:49:00 +0000 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250402_114918_038323_42CDE47F X-CRM114-Status: GOOD ( 25.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 02 2025, Pasha Tatashin wrote: > On Wed, Apr 2, 2025 at 12:47=E2=80=AFPM Pratyush Yadav 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 wrote: [...] >> >> >> >> The memblock_reserve side we can optimize later, I agree. But the mem= ory >> >> 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 t= han >> >> 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 a= nd >> > 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. --=20 Regards, Pratyush Yadav