From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Minchan Kim <minchan@kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC][PATCH 4/6] SRCU free VMAs
Date: Mon, 20 Oct 2014 16:41:45 -0700 [thread overview]
Message-ID: <CA+55aFwd04q+O5ejbmDL-H7_GB6DEBMiiHkn+2R1u4uWxfDO9w@mail.gmail.com> (raw)
In-Reply-To: <20141020222841.419869904@infradead.org>
On Mon, Oct 20, 2014 at 2:56 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> Manage the VMAs with SRCU such that we can do a lockless VMA lookup.
Can you explain why srcu, and not plain regular rcu?
Especially as you then *note* some of the problems srcu can have.
Making it regular rcu would also seem to make it possible to make the
seqlock be just a seqcount, no?
Linus
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next prev parent reply other threads:[~2014-10-20 23:41 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 21:56 [RFC][PATCH 0/6] Another go at speculative page faults Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 1/6] mm: Dont assume page-table invariance during faults Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 2/6] mm: Prepare for FAULT_FLAG_SPECULATIVE Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 3/6] mm: VMA sequence count Peter Zijlstra
2014-10-22 11:26 ` Kirill A. Shutemov
2014-10-22 11:39 ` Peter Zijlstra
2014-10-22 11:53 ` Kirill A. Shutemov
2014-10-22 12:15 ` Peter Zijlstra
2014-10-22 13:44 ` Peter Zijlstra
2014-10-23 12:36 ` Kirill A. Shutemov
2014-10-23 14:22 ` Peter Zijlstra
2014-10-23 15:05 ` Kirill A. Shutemov
2014-10-20 21:56 ` [RFC][PATCH 4/6] SRCU free VMAs Peter Zijlstra
2014-10-20 23:41 ` Linus Torvalds [this message]
2014-10-21 8:07 ` Peter Zijlstra
2014-10-24 15:16 ` Christoph Lameter
2014-10-24 15:51 ` Peter Zijlstra
2014-10-24 17:08 ` Christoph Lameter
2014-10-21 8:22 ` Peter Zijlstra
2014-10-23 10:14 ` Lai Jiangshan
2014-10-23 11:03 ` Peter Zijlstra
2014-10-24 3:33 ` Lai Jiangshan
2014-10-24 7:26 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 5/6] mm: Provide speculative fault infrastructure Peter Zijlstra
2014-10-21 8:35 ` Kirill A. Shutemov
2014-10-21 10:41 ` Peter Zijlstra
2014-10-21 19:00 ` Peter Zijlstra
2014-10-20 21:56 ` [RFC][PATCH 6/6] mm,x86: Add speculative pagefault handling Peter Zijlstra
2014-10-21 0:07 ` [RFC][PATCH 0/6] Another go at speculative page faults Andy Lutomirski
2014-10-21 8:11 ` Peter Zijlstra
2014-10-21 16:23 ` Ingo Molnar
2014-10-21 17:09 ` Kirill A. Shutemov
2014-10-21 17:56 ` Peter Zijlstra
2014-10-23 10:40 ` Lai Jiangshan
2014-10-23 11:04 ` Peter Zijlstra
2014-10-24 7:54 ` Ingo Molnar
2014-10-24 13:14 ` Peter Zijlstra
2014-10-28 5:32 ` Namhyung Kim
2014-10-21 17:25 ` Peter Zijlstra
2014-10-22 12:35 ` Ingo Molnar
2014-10-22 7:34 ` Davidlohr Bueso
2014-10-22 11:29 ` Kirill A. Shutemov
2014-10-22 11:45 ` Peter Zijlstra
2014-10-22 11:55 ` Kirill A. Shutemov
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