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From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	torvalds@linux-foundation.org, paulmck@linux.vnet.ibm.com,
	tglx@linutronix.de, akpm@linux-foundation.org, riel@redhat.com,
	mgorman@suse.de, oleg@redhat.com, mingo@redhat.com,
	minchan@kernel.org, kamezawa.hiroyu@jp.fujitsu.com,
	viro@zeniv.linux.org.uk, dave@stgolabs.net,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults
Date: Fri, 24 Oct 2014 09:54:23 +0200	[thread overview]
Message-ID: <20141024075423.GA24479@gmail.com> (raw)
In-Reply-To: <20141023110438.GQ21513@worktop.programming.kicks-ass.net>


* Peter Zijlstra <peterz@infradead.org> wrote:

> On Thu, Oct 23, 2014 at 06:40:05PM +0800, Lai Jiangshan wrote:
> > On 10/22/2014 01:56 AM, Peter Zijlstra wrote:
> > > On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote:
> > >> It would be interesting to see if the patchset affects non-condended case.
> > >> Like a one-threaded workload.
> > > 
> > > It does, and not in a good way, I'll have to look at that... :/
> > 
> > Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage of
> > the vmacache_find() and cause more cache-misses.
> 
> Its what I thought initially, I tried doing perf record with and
> without, but then I ran into perf diff not quite working for me and I've
> yet to find time to kick that thing into shape.

Might be the 'perf diff' regression fixed by this:

  9ab1f50876db perf diff: Add missing hists__init() call at tool start

I just pushed it out into tip:master.

Thanks,

	Ingo

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  reply	other threads:[~2014-10-24  7:54 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
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 [this message]
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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