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From: "Huang\, Ying" <ying.huang@intel.com>
To: Andrea Parri <andrea.parri@amarulasolutions.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,  <linux-mm@kvack.org>,
	 <linux-kernel@vger.kernel.org>,  Hugh Dickins <hughd@google.com>,
	 "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
	 Minchan Kim <minchan@kernel.org>,
	 Johannes Weiner <hannes@cmpxchg.org>,
	 Tim Chen <tim.c.chen@linux.intel.com>,
	 Mel Gorman <mgorman@techsingularity.net>,
	 Jérôme Glisse <jglisse@redhat.com>,
	 Michal Hocko <mhocko@suse.com>,
	 Andrea Arcangeli <aarcange@redhat.com>,
	 David Rientjes <rientjes@google.com>,
	 Rik van Riel <riel@redhat.com>,  Jan Kara <jack@suse.cz>,
	 Dave Jiang <dave.jiang@intel.com>,
	 Daniel Jordan <daniel.m.jordan@oracle.com>
Subject: Re: [PATCH -mm -V7] mm, swap: fix race between swapoff and some swap operations
Date: Fri, 15 Feb 2019 14:34:09 +0800	[thread overview]
Message-ID: <87a7ixblwe.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <20190212101316.GA6905@andrea> (Andrea Parri's message of "Tue, 12 Feb 2019 11:13:16 +0100")

Andrea Parri <andrea.parri@amarulasolutions.com> writes:

>> Alternative implementation could be replacing disable preemption with
>> rcu_read_lock_sched and stop_machine() with synchronize_sched().
>
> JFYI, starting with v4.20-rc1, synchronize_rcu{,expedited}() also wait
> for preempt-disable sections (the intent seems to retire the RCU-sched
> update-side API), so that here you could instead use preempt-disable +
> synchronize_rcu{,expedited}().  This LWN article gives an overview of
> the latest RCU API/semantics changes: https://lwn.net/Articles/777036/.

Thanks a lot!  The article is really helpful!

Best Regards,
Huang, Ying

>   Andrea


  reply	other threads:[~2019-02-15  6:34 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11  8:38 [PATCH -mm -V7] mm, swap: fix race between swapoff and some swap operations Huang, Ying
2019-02-11 19:06 ` Daniel Jordan
2019-02-12  3:21   ` Andrea Parri
2019-02-12  6:47     ` Huang, Ying
2019-02-12 17:58       ` Tim Chen
2019-02-13  3:23         ` Huang, Ying
2019-02-12 20:06     ` Daniel Jordan
2019-02-12  6:40   ` Huang, Ying
2019-02-12 10:13 ` Andrea Parri
2019-02-15  6:34   ` Huang, Ying [this message]
2019-02-14  2:38 ` Andrea Arcangeli
2019-02-14  8:07   ` Huang, Ying
2019-02-14 21:47     ` Andrea Arcangeli
2019-02-15  7:50       ` Huang, Ying
2019-02-14 14:33 ` Michal Hocko
2019-02-14 20:30   ` Andrew Morton
2019-02-14 21:22     ` Andrea Arcangeli
2019-02-15  7:08   ` Huang, Ying
2019-02-15 13:11     ` Michal Hocko
2019-02-18  0:51       ` Huang, Ying

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