linux-kernel - Re: [PATCH 94/94] mm: Move mas locking outside of munmap() path.

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Date:   Mon, 3 May 2021 16:05:09 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Michel Lespinasse <michel@...pinasse.org>
CC:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>
Subject: Re: [PATCH 94/94] mm: Move mas locking outside of munmap() path.

* Michel Lespinasse <michel@...pinasse.org> [210501 02:13]:
> On Wed, Apr 28, 2021 at 03:36:32PM +0000, Liam Howlett wrote:
> > Now that there is a split variant that allows splitting to use a maple state,
> > move the locks to a more logical position.
> 
> In this patch set, is the maple tree lock ever held outside of code
> sections already protected by the mmap write lock ?


No, the maple tree lock is a currently a subset of the mmap write lock.

Thanks,
Liam