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

[Mark Rutland]

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@xxxxxxx> 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.