Date: Mon, 22 Nov 2021 18:04:40 +0100 From: =?UTF-8?Q?Micha=C5=82_G=C3=B3rny?= <mgorny@moritz.systems> To: Ed Maste <emaste@freebsd.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, John Baldwin <jhb@freebsd.org>, Peter Wemm <peter@freebsd.org> Subject: Re: Looking for rationale for the minidump format Message-ID: <1b140e6f5e3a44fe875820fd0a5a2d621ae23ae5.camel@moritz.systems> In-Reply-To: <CAPyFy2Bhpj5MQK72b1A1X4=ez2okuuDo3rrx8Hn4BHk1OPtRKQ@mail.gmail.com> References: <305082d9f216bb8382773c074eaf7a5c3101cc13.camel@moritz.systems> <CAPyFy2Bhpj5MQK72b1A1X4=ez2okuuDo3rrx8Hn4BHk1OPtRKQ@mail.gmail.com>
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On Mon, 2021-11-22 at 10:26 -0500, Ed Maste wrote: > On Sun, 21 Nov 2021 at 09:42, Michał Górny <mgorny@moritz.systems> wrote: > > > > Hi, everyone. > > > > As part of the work contracted by the FreeBSD Foundation, I'm working > > on adding explicit minidump support to LLDB. When discussing > > the options with upstream, I've been asked why FreeBSD created their own > > minidump format. > > > > I did a bit of digging but TBH all the rationale I could get was to > > create partial memory dumps. However, unless I'm mistaken the ELF > > format is perfectly capable of that -- e.g. via creating an explicit > > segment for every continuous active region. > > ELF can, indeed. One of my previous co-op students wrote a little tool > to convert a minidump to ELF, see https://reviews.freebsd.org/D19253. > That's what it does - creates a segment for each contiguous region. If > we ended up going this way we could integrate D19253 into savecore. Thank you for your reply. I think this approach makes sense. Do you want us to pursue updating D19253 to build again (it's failing due to libkvm API changes and -Werror) and moving it into savecore instead of adding FreeBSD minidump support in LLDB? -- Best regards, Michał Górny
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