linux-kernel - Re: [PATCH] modpost: check for static EXPORT

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Message-ID: <20190729224007.2f7fdcb4@canb.auug.org.au>
Date:   Mon, 29 Jul 2019 22:40:07 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Emil Velikov <emil.l.velikov@...il.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] modpost: check for static EXPORT_SYMBOL* functions

Hi Denis,

On Mon, 29 Jul 2019 12:16:29 +0300 Denis Efremov <efremov@...ux.com> wrote:
>
> > Just a reminder that some of us (just me?) do well over 100+ builds per
> > day ...  if this can be optimised some what that would be good.  
> 
> These measurements for the worst case (allmodconfig). Is it possible to 
> measure the slowdown in your case? How it will perform on your typical 
> workflow?

I did 3 x86_64 allmodconfig builds without and with the patch (I do
-j 80 powerpc64 le hosted cross builds) and it doesn't look like the
patch has much impact at all.

Without the patch:

real	8m41.390s user	587m25.249s sys	22m0.411s
real	8m40.100s user	587m32.148s sys	21m58.419s
real	8m40.084s user	587m25.311s sys	22m2.794s

With the patch:

real	8m40.351s user	587m21.819s sys	21m57.389s
real	8m40.868s user	587m23.730s sys	21m58.737s
real	8m40.970s user	587m22.525s sys	22m2.467s

I do other builds as well, but that is the biggest, so actually looks
ok.
-- 
Cheers,
Stephen Rothwell

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