From: Peter Zijlstra <peterz@infradead.org>
To: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Linux MM <linux-mm@kvack.org>, Andi Kleen <ak@linux.intel.com>,
Mel Gorman <mgorman@techsingularity.net>, Jan Kara <jack@suse.cz>,
Michal Hocko <mhocko@suse.com>, Davidlohr Bueso <dbueso@suse.de>,
Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Al Viro <viro@ZenIV.linux.org.uk>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: mmap_sem bottleneck
Date: Tue, 18 Oct 2016 17:02:43 +0200 [thread overview]
Message-ID: <20161018150243.GZ3117@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <4661f9fd-a239-ee82-476e-a5d039d8abee@linux.vnet.ibm.com>
On Tue, Oct 18, 2016 at 04:50:10PM +0200, Laurent Dufour wrote:
> On 17/10/2016 14:51, Peter Zijlstra wrote:
> > Latest version is here:
> >
> > https://lkml.kernel.org/r/20141020215633.717315139@infradead.org
> >
> > Plenty of bits left to sort with that, but the general idea is to use
> > the split page-table locks (PTLs) as range lock for the mmap_sem.
>
> Thanks Peter for the pointer,
>
> It sounds that some parts of this series are already upstream, like the
> use of the fault_env structure,
Right, Kirill picked that up.
> but the rest of the code need some
> refresh to apply on the latest kernel. I'll try to update your series
> and will give it a try asap.
>
> This being said, I'm wondering if the concern Kirill raised about the
> VMA sequence count handling are still valid...
Yes, I think they are. I don't think I put much time into it after that
exchange :-(
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next prev parent reply other threads:[~2016-10-18 15:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-17 12:33 mmap_sem bottleneck Laurent Dufour
2016-10-17 12:51 ` Peter Zijlstra
2016-10-18 14:50 ` Laurent Dufour
2016-10-18 15:01 ` Kirill A. Shutemov
2016-10-18 15:02 ` Peter Zijlstra [this message]
2016-11-18 11:08 ` [RFC PATCH v2 0/7] Speculative page faults Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 1/7] mm: Dont assume page-table invariance during faults Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 2/7] mm: Prepare for FAULT_FLAG_SPECULATIVE Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 3/7] mm: Introduce pte_spinlock Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 4/7] mm: VMA sequence count Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 5/7] SRCU free VMAs Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 6/7] mm: Provide speculative fault infrastructure Laurent Dufour
2016-11-18 11:08 ` [RFC PATCH v2 7/7] mm,x86: Add speculative pagefault handling Laurent Dufour
2016-11-18 14:08 ` [RFC PATCH v2 0/7] Speculative page faults Andi Kleen
2016-12-01 8:34 ` Laurent Dufour
2016-12-01 12:50 ` Balbir Singh
2016-12-01 13:26 ` Laurent Dufour
2016-12-02 14:10 ` Michal Hocko
2016-10-17 12:57 ` mmap_sem bottleneck Michal Hocko
2016-10-20 7:23 ` Laurent Dufour
2016-10-20 10:55 ` Michal Hocko
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