linux-kernel - Re: [PATCH 1/7] [RFC PATCH 1/7] osdump: Add one new os minidump module

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Message-ID: <CADHLONHHZAeubePPfZbG1N0Nv3ZJM5OWaJWqchBUpiN5Q27UdQ@mail.gmail.com>
Date: Sat, 23 Dec 2023 23:30:13 +0800
From: ruipeng qi <ruipengqi7@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: catalin.marinas@....com, will@...nel.org, bhe@...hat.com, 
	vgoyal@...hat.com, dyoung@...hat.com, linux-kernel@...r.kernel.org, 
	kexec@...ts.infradead.org, zalbassam@...gle.com, dianders@...omium.org, 
	mark.rutland@....com, lecopzer.chen@...iatek.com, maz@...nel.org, 
	arnd@...db.de, yury.norov@...il.com, brauner@...nel.org, mcgrof@...nel.org, 
	maninder1.s@...sung.com, michael.christie@...cle.com, samitolvanen@...gle.com, 
	linux-arm-kernel@...ts.infradead.org, qiruipeng@...iang.com
Subject: Re: [PATCH 1/7] [RFC PATCH 1/7] osdump: Add one new os minidump module

On Sat, Dec 23, 2023 at 11:13 PM ruipeng qi <ruipengqi7@...il.com> wrote:

> > I don't see a problem why minidump cannot do it.
> Qcom minidump allows one kernel client to register its region to dump, and then
> driver will create and maintain one elf head for it.
> But osdump will dump thousands of non-continuous regions. If you register one
> by one, and add an elf head for each, it will cause heavy overhead. So it store
> data in binary, and reassemble a standard elf format file offline for debug.
>
Osdump will only dump useful data, which may have been allocated before but
freed now. In a word, useful data are changing all the time. I think this is not
suitable for Qcom minidump's framework。

Best Regards
Ruipeng