From: "Huang\, Ying" <ying.huang@intel.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Hugh Dickins <hughd@google.com>, Minchan Kim <minchan@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Tim Chen <tim.c.chen@linux.intel.com>, Shaohua Li <shli@fb.com>,
Mel Gorman <mgorman@techsingularity.net>,
Jerome Glisse <jglisse@redhat.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>, Aaron Lu <aaron.lu@intel.com>
Subject: Re: [PATCH -mm -V2] mm, swap: Fix race between swapoff and some swap operations
Date: Fri, 15 Dec 2017 14:37:44 +0800 [thread overview]
Message-ID: <87bmj0lcnb.fsf@yhuang-dev.intel.com> (raw)
In-Reply-To: <871sjwn5bk.fsf@yhuang-dev.intel.com> (Ying Huang's message of "Fri, 15 Dec 2017 09:33:03 +0800")
"Huang, Ying" <ying.huang@intel.com> writes:
> Michal Hocko <mhocko@kernel.org> writes:
>
>> Btw. have you considered pcp refcount framework. I would suspect that
>> this would give you close to SRCU performance.
>
> No. I think pcp refcount doesn't fit here. You should hold a initial
> refcount for pcp refcount, it isn't the case here.
Sorry, I am wrong here. We have an initial refcount for swap device.
So pcp refcount could be used here.
Best Regards,
Huang, Ying
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prev parent reply other threads:[~2017-12-15 6:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-14 13:38 [PATCH -mm -V2] mm, swap: Fix race between swapoff and some swap operations Huang, Ying
2017-12-14 13:38 ` Huang, Ying
2017-12-14 15:17 ` Michal Hocko
2017-12-14 15:17 ` Michal Hocko
2017-12-14 20:42 ` Andrew Morton
2017-12-14 20:42 ` Andrew Morton
2017-12-15 1:57 ` Huang, Ying
2017-12-15 10:04 ` Michal Hocko
2017-12-15 10:04 ` Michal Hocko
2017-12-15 22:27 ` Andrew Morton
2017-12-15 22:27 ` Andrew Morton
2017-12-15 1:33 ` Huang, Ying
2017-12-15 5:49 ` Paul E. McKenney
2017-12-15 5:49 ` Paul E. McKenney
2017-12-15 6:37 ` Huang, Ying [this message]
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