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

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Date:   Tue, 15 Nov 2016 13:36:03 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Joel Fernandes <joelaf@...gle.com>
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

On Tue, Nov 15, 2016 at 11:55 AM, Joel Fernandes <joelaf@...gle.com> wrote:
> 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.

Cool. Does something normally parse these? Lots of kernel addresses is
all I see. ;)

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

Sure thing! It should make the multi-pmsg change easier too.

-Kees

-- 
Kees Cook
Nexus Security