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From: Michel Lespinasse <walken@google.com>
To: Markus Elfring <Markus.Elfring@web.de>
Cc: linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	 Coccinelle <cocci@systeme.lip6.fr>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Vlastimil Babka <vbabka@suse.cz>,
	Matthew Wilcox <willy@infradead.org>,
	 Liam Howlett <Liam.Howlett@oracle.com>,
	Jerome Glisse <jglisse@redhat.com>,
	 Davidlohr Bueso <dave@stgolabs.net>,
	David Rientjes <rientjes@google.com>,
	Hugh Dickins <hughd@google.com>,  Jason Gunthorpe <jgg@ziepe.ca>,
	Peter Zijlstra <peterz@infradead.org>,
	 Laurent Dufour <ldufour@linux.ibm.com>,
	Ying Han <yinghan@google.com>
Subject: Re: [PATCH v2 04/10] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
Date: Fri, 27 Mar 2020 00:44:29 -0700
Message-ID: <CANN689E-SZhv3tvYc11cNuvGwCi1V1n1ztAnLkUPGvvz7C85dQ@mail.gmail.com> (raw)
In-Reply-To: <d780d91f-43fa-b2ec-1a08-80013b153a56@web.de>

On Fri, Mar 27, 2020 at 12:22 AM Markus Elfring <Markus.Elfring@web.de> wrote:
>
> > 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?

I think this version of the patch is already a single rule, similar to
what you suggested ?

> > // 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?

I'm not sure it matters that much, as long as it produces the correct
end result. The run takes about 25 seconds before any optimizations,
which I find very acceptable.

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27  2:10 [PATCH v2 00/10] Add a new mmap locking API wrapping mmap_sem calls Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 01/10] mmap locking API: initial implementation as rwsem wrappers Michel Lespinasse
2020-03-27 12:16   ` Jason Gunthorpe
2020-03-27 21:52     ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 02/10] MMU notifier: use the new mmap locking API Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 03/10] DMA reservations: " Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 04/10] mmap locking API: use coccinelle to convert mmap_sem rwsem call sites Michel Lespinasse
2020-03-27  7:22   ` Markus Elfring
2020-03-27  7:44     ` Michel Lespinasse [this message]
2020-03-27  8:00       ` [v2 " Markus Elfring
2020-03-27  8:08         ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 05/10] mmap locking API: convert mmap_sem call sites missed by coccinelle Michel Lespinasse
2020-03-27  8:21   ` Markus Elfring
2020-03-27  2:10 ` [PATCH v2 06/10] mmap locking API: convert nested write lock sites Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 07/10] mmap locking API: add mmap_read_release() and mmap_read_unlock_non_owner() Michel Lespinasse
2020-03-27  4:46   ` Davidlohr Bueso
2020-03-27  5:09     ` Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 08/10] mmap locking API: add MMAP_LOCK_INITIALIZER Michel Lespinasse
2020-03-27  2:10 ` [PATCH v2 09/10] mmap locking API: use lockdep_assert_held Michel Lespinasse
2020-03-27  4:48   ` Davidlohr Bueso
2020-03-27  2:10 ` [PATCH v2 10/10] mmap locking API: rename mmap_sem to mmap_lock Michel Lespinasse

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