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Re: [PATCH v2] coccicheck: process every source file at once




On Tue, Oct 2, 2018 at 1:03 PM Jacob Keller <jacob.e.keller@xxxxxxxxx> wrote:
>
> From: Jacob Keller <jacob.keller@xxxxxxxxx>
>
> make coccicheck is used in order to apply coccinelle semantic patches,
> and see if any of the transformations found within contrib/coccinelle/
> can be applied to the current code base.
>
> Pass every file to a single invocation of spatch, instead of running
> spatch once per source file.
>
> This reduces the time required to run make coccicheck by a significant
> amount of time:
>
> Prior timing of make coccicheck
>   real    6m14.090s
>   user    25m2.606s
>   sys     1m22.919s
>
> New timing of make coccicheck
>   real    1m36.580s
>   user    7m55.933s
>   sys     0m18.219s
>
> This is nearly a 4x decrease in the time required to run make
> coccicheck. This is due to the overhead of restarting spatch for every
> file. By processing all files at once, we can amortize this startup cost
> across the total number of files, rather than paying it once per file.
>
> Signed-off-by: Jacob Keller <jacob.keller@xxxxxxxxx>
> ---

Woops, ignore this version, it doesn't quite work.

Thanks,
Jake