Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended()

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To: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Subject: Re: [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended()
From: Michel Lespinasse <walken@xxxxxxxxxx>
Date: Fri, 14 Aug 2020 01:30:39 -0700
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, Davidlohr Bueso <dbueso@xxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Steven Price <steven.price@xxxxxxx>, Song Liu <songliubraving@xxxxxx>, Jimmy Assarsson <jimmyassarsson@xxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-mediatek@xxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, wsd_upstream@xxxxxxxxxxxx
In-reply-to: <1597284810-17454-2-git-send-email-chinwen.chang@mediatek.com>

On Wed, Aug 12, 2020 at 7:14 PM Chinwen Chang
<chinwen.chang@xxxxxxxxxxxx> wrote:
>
> Add new API to query if someone wants to acquire mmap_lock
> for write attempts.
>
> Using this instead of rwsem_is_contended makes it more tolerant
> of future changes to the lock type.
>
> Signed-off-by: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>

Acked-by: Michel Lespinasse <walken@xxxxxxxxxx>

References:
- [PATCH v2 0/2] Try to release mmap_lock temporarily in smaps_rollup
  - From: Chinwen Chang
- [PATCH v2 1/2] mmap locking API: add mmap_lock_is_contended()
  - From: Chinwen Chang

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