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Date: Thu, 28 Jul 2016 10:38:12 -0400
From: Steven Rostedt <rostedt@goodmis.org>
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Subject: Re: [Qemu-devel] [PATCH 6/7] qemu: Implement virtio-pstore device
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To: Namhyung Kim <namhyung@kernel.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, LKML <linux-kernel@vger.kernel.org>, Paolo Bonzini <pbonzini@redhat.com>, Radim =?UTF-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>, Anthony Liguori <aliguori@amazon.com>, Anton Vorontsov <anton@enomsg.org>, Colin Cross <ccross@android.com>, Kees Cook <keescook@chromium.org>, Tony Luck <tony.luck@intel.com>, Ingo Molnar <mingo@kernel.org>, Minchan Kim <minchan@kernel.org>

On Thu, 28 Jul 2016 14:39:53 +0900
Namhyung Kim <namhyung@kernel.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