linux-kernel - Re: [PATCH 6/7] qemu: Implement virtio-pstore device

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Message-ID: <20160728103812.41e02ae5@gandalf.local.home>
Date:	Thu, 28 Jul 2016 10:38:12 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, <kvm@...r.kernel.org>,
	<qemu-devel@...gnu.org>,
	<virtualization@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	Anthony Liguori <aliguori@...zon.com>,
	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 6/7] qemu: Implement virtio-pstore device

On Thu, 28 Jul 2016 14:39:53 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> Well, I dont' know.  As you know, the kernel oops dump is already sent
> to serial device but it's rather slow.  As I wrote in the cover
> letter, enabling ftrace_dump_on_oops makes it even worse..  Also
> pstore saves the (compressed) binary data so I thought it'd be better
> to have a dedicated IO channel.

BTW, I agree with this. It is better to have a quick way to grab the
ftrace buffers when a crash happens, as serial is excruciatingly slow.
Although, currently I still use kexec/kdump, but as Namhyung said, it
depends on crash being up to date. I tend to be sending in updates
every time I have to use it.

-- Steve