linux-kernel - Re: [PATCHv3 1/6] atomics: add common header generation files

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Date:   Fri, 16 Nov 2018 02:51:21 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mingo@...nel.org, arnd@...db.de, aryabinin@...tuozzo.com,
        boqun.feng@...il.com, catalin.marinas@....com, dvyukov@...gle.com,
        glider@...gle.com, linuxdrivers@...otech.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        will.deacon@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv3 1/6] atomics: add common header generation files

Hi Andrew,

On Thu, Nov 15, 2018 at 03:10:48PM -0800, Andrew Morton wrote:
> On Tue,  4 Sep 2018 11:48:25 +0100 Mark Rutland <mark.rutland@....com> wrote:
> 
> > To minimize repetition, to allow for future rework, and to ensure
> > regularity of the various atomic APIs, we'd like to automatically
> > generate (the bulk of) a number of headers related to atomics.
> > 
> > This patch adds the infrastructure to do so, leaving actual conversion
> > of headers to subsequent patches.
> 
> This thing is appallingly slow.  `sh scripts/atomic/check-atomics.sh'
> takes 8 seconds on a machine which builds an allnoconfig kernel in 30
> seconds.

Hmm... on my laptop it's less than half that, and allnoconfig takes ~35s, so
clearly there's a major difference between our setups.

For reference, which distro are you using, and what is /bin/sh on your box?
 
> Um, no.  Just no.  Please find a way to make this overhead go away.

Will do.

Trivially, switching to diff -q halves the check runtime for me, and I'm sure
there are other parts of the scripting which can be optimized.

Thanks,
Mark.