linux-kernel - Re: [PATCH v2 04/10] mmap locking API: use coccinelle to convert mmap

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Date:   Fri, 27 Mar 2020 08:22:09 +0100
From:   Markus Elfring <Markus.Elfring@....de>
To:     Michel Lespinasse <walken@...gle.com>,
        linux-mm <linux-mm@...ck.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Coccinelle <cocci@...teme.lip6.fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Liam Howlett <Liam.Howlett@...cle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        David Rientjes <rientjes@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Peter Zijlstra <peterz@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH v2 04/10] mmap locking API: use coccinelle to convert
 mmap_sem rwsem call sites

> This change converts the existing mmap_sem rwsem calls to use the new
> mmap locking API instead.
>
> The change is generated using coccinelle with the following rules:

Would you like to apply only a single SmPL rule here?


> // spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir .

Command parameters like “--jobs 8 --chunksize 1” can be also helpful
for a parallel execution of the desired software transformation.

I suggest to consider another possibility for a bit of fine-tuning in the shown
SmPL script if you would eventually care for nicer run time characteristics
for the application of such a SmPL disjunction.
How do you think about to order the elements according to a probable
function call frequency?

Regards,
Markus