linux-kernel - Re: [PATCH v3 0/8] pstore: Improve performance of ftrace backend with ramoops

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Date:   Tue, 15 Nov 2016 11:55:48 -0800
From:   Joel Fernandes <joelaf@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/8] pstore: Improve performance of ftrace backend with ramoops

Hi Kees,

On Fri, Nov 11, 2016 at 2:21 PM, Kees Cook <keescook@...omium.org> wrote:
> Hi Joel,
>
> I've reorganized a bunch of the logic here. Since pstore is going to need
> the init_przs() logic for multiple pmsg przs, I wanted to get this in and
> make sure I was happy with how it looks. I figured this would reduce our
> round-trip time on reviews. :)
>
> Can you test this series and verify that it works as you're expecting? I've
> validated some basic behavior already, but don't have a good test-case for
> ftrace. What commands do you actually use for testing ftrace? I'd like to
> add something to my local tests.

I normally do the following:

dd if=/dev/urandom | pv | dd of=/dev/null

and in parallel, I do a:
echo 1 > /sys/kernel/debug/pstore/record_ftrace

and then check the throughput; and then reboot the system and do a
read out of /sys/fs/pstore/ ftrace file.

I will try these patches out today and thanks for refactoring the init
prz stuff.

Regards,
Joel