linux-kernel - Re: [RFC][PATCH 00/13] Cleanup recordmcount and begin objtool conversion

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Date:   Tue, 28 May 2019 10:50:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Matt Helsley <mhelsley@...are.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC][PATCH 00/13] Cleanup recordmcount and begin objtool
 conversion

On Tue, 28 May 2019 09:43:28 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> Thanks for the patches.  This looks like a good step in the right
> direction.

Good to hear.

> 
> What's the performance difference between the old recordmcount and the
> new version which relies on elf_open()?  It would be useful to compare
> kernel build times, before and after.

I'll let Matt answer these.

> 
> Would it be feasible to eventually combine subcommands so that objtool
> could do both ORC and mcount generation in a single invocation?  I
> wonder what what the interface would look like.

That is actually the goal of this work. To eventually be able to do
single passes to accomplish multiple tasks.

-- Steve