linux-kernel - Re: [PATCH] Drivers: hv: Change flag to write log level in panic msg to false

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Message-ID: <20200710092440.GA16562@aepfle.de>
Date:   Fri, 10 Jul 2020 11:24:40 +0200
From:   Olaf Hering <olaf@...fle.de>
To:     Joseph Salisbury <joseph.salisbury@...rosoft.com>,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        mikelley@...rosoft.com
Cc:     wei.liu@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: Change flag to write log level in panic msg
 to false

On Fri, Jun 26, Joseph Salisbury wrote:

> When the kernel panics, one page worth of kmsg data is written to an allocated
> page.  The Hypervisor is notified of the page address trough the MSR.  This
> panic information is collected on the host.  Since we are only collecting one
> page of data, the full panic message may not be collected.

Are the people who need to work with this tiny bit of information
satisfied already, or did they already miss info even with this patch?

I'm asking because kmsg_dump_get_buffer unconditionally includes the
timestamp (unless it is enabled). I do wonder if there should be an API
addition to omit the timestamp. Then even more dmesg output can be
written into the 4k buffer.

Olaf

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