From: Andrew Morton <akpm@linux-foundation.org>
To: Davidlohr Bueso <dave@stgolabs.net>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
Waiman Long <longman@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH] hugetlbfs: Take read_lock on i_mmap for PMD sharing
Date: Thu, 7 Nov 2019 19:22:02 -0800 [thread overview]
Message-ID: <20191107192202.8869589f225132480d77a33b@linux-foundation.org> (raw)
In-Reply-To: <20191108020456.sulyjskhq3s5zcaa@linux-p48b>
On Thu, 7 Nov 2019 18:04:56 -0800 Davidlohr Bueso <dave@stgolabs.net> wrote:
> On Thu, 07 Nov 2019, Mike Kravetz wrote:
>
> >Note that huge_pmd_share now increments the page count with the semaphore
> >held just in read mode. It is OK to do increments in parallel without
> >synchronization. However, we don't want anyone else changing the count
> >while that check in huge_pmd_unshare is happening. Hence, the need for
> >taking the semaphore in write mode.
>
> This would be a nice addition to the changelog methinks.
Done.
next prev parent reply other threads:[~2019-11-08 3:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 19:06 [PATCH] hugetlbfs: Take read_lock on i_mmap for PMD sharing Waiman Long
2019-11-07 19:13 ` Waiman Long
2019-11-07 19:15 ` Waiman Long
2019-11-07 19:31 ` Mike Kravetz
2019-11-07 19:42 ` Matthew Wilcox
2019-11-07 21:06 ` Waiman Long
2019-11-07 19:54 ` Matthew Wilcox
2019-11-07 21:27 ` Waiman Long
2019-11-07 21:49 ` Mike Kravetz
2019-11-07 21:56 ` Mike Kravetz
2019-11-08 2:04 ` Davidlohr Bueso
2019-11-08 3:22 ` Andrew Morton [this message]
2019-11-08 19:10 ` Mike Kravetz
2019-11-09 1:47 ` Mike Kravetz
2019-11-12 17:27 ` Waiman Long
2019-11-12 23:11 ` Mike Kravetz
2019-11-13 2:55 ` Waiman Long
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