linux-kernel - Re: [PATCH v1 0/3] allow ramoops to collect all kmesg

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Message-ID: <202005041211.040A1C65C8@keescook>
Date:   Mon, 4 May 2020 12:12:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     James Morris <jmorris@...ei.org>, Sasha Levin <sashal@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>, anton@...msg.org,
        ccross@...roid.com, Tony Luck <tony.luck@...el.com>,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 0/3] allow ramoops to collect all kmesg_dump events

On Mon, May 04, 2020 at 02:47:45PM -0400, Pavel Tatashin wrote:
> > > # reboot -f
> > >
> > > After VM is back:
> > >
> > > # mount -t pstore pstore /mnt
> > > # head /mnt/dmesg-ramoops-0
> > > Restart#1 Part1
> >
> > Is there a reason that using ramoops.console_size isn't sufficient for
> > this?
> 
> Unfortunately, the console option is not working for us (Microsoft),
> we have an embedded device with a serial console, and the baud rate
> reduces the reboot performance, so we must keep the console quiet. We
> also want to be able collect full shutdown logs from the field that
> are collected during kexec based updates.

I meant collecting console via pstore (i.e. /mnt/console-ramoops-0). Are
you saying that's still too large for your situation?

-- 
Kees Cook