linux-kernel - Re: [PATCH 5/5] hugetlbfs: Limit wait time when trying to share huge PMD

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Message-ID: <f22d641f-d36e-e61e-70aa-3e54632485fe@redhat.com>
Date:   Mon, 16 Sep 2019 09:53:43 -0400
From:   Waiman Long <longman@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 5/5] hugetlbfs: Limit wait time when trying to share huge
 PMD

On 9/12/19 12:40 AM, Davidlohr Bueso wrote:
>
> I also think that the right solution is within the mm instead of adding
> a new api to rwsem and the extra complexity/overhead to osq _just_ for
> this
> case. We've managed to not need timeout extensions in our locking
> primitives
> thus far, which is a good thing imo. 

Adding a variant with timeout can be useful in resolving some potential
deadlock issues found by lockdep. Anyway, there were talk about merging
rt-mutex and regular mutex in the LPC last week. So we will need to have
mutex_lock() variant with timeout for that to happen.

Cheers,
Longman