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From: Peter Zijlstra <peterz@infradead.org>
To: Don Zickus <dzickus@redhat.com>
Cc: dave.hansen@linux.intel.com, eranian@google.com,
	ak@linux.intel.com, jmario@redhat.com,
	linux-kernel@vger.kernel.org, acme@infradead.org,
	mingo@kernel.org
Subject: Re: [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip()
Date: Thu, 17 Oct 2013 17:09:44 +0200	[thread overview]
Message-ID: <20131017150944.GQ10651@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20131017150358.GN227855@redhat.com>

On Thu, Oct 17, 2013 at 11:03:58AM -0400, Don Zickus wrote:
> On Thu, Oct 17, 2013 at 04:51:31PM +0200, Peter Zijlstra wrote:
> > On Thu, Oct 17, 2013 at 10:49:13AM -0400, Don Zickus wrote:
> > > For some reason this patch is page faulting at an invalid address inside
> > > __intel_pmu_pebs_event().
> > 
> > Ah yes, I lost a refresh, but read on; I've send a gazillion new emails
> > since ;-)
> 
> Yes, I have noticed, but I got worried when you labeled some of them with
> 'untested'. :-)  Thought I would stick to something a little more close to
> working.
> 
> > 
> > I think it was something like: s/this_cpu_ptr/this_cpu_read/ to make it
> > work again.
> 
> Thanks.  I will try some of the other pieces today (unlike yesterday).

The patches you find in:

http://programming.kicks-ass.net/sekrit/patches.tar.bz2

are actually running on my machine now.

One of the things I was considering was further shrinking the max basic
block size from 4k to maybe 1k or 512 bytes. Not sure what a sane basic
block length limit would be.

I did try 1k earlier today and I seemed to still get near 100% rewind
success rates.

Stephane, Andi, any clues?

  reply	other threads:[~2013-10-17 15:09 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-14 20:35 x86, perf: throttling issues with long nmi latencies Don Zickus
2013-10-14 21:28 ` Andi Kleen
2013-10-15 10:14 ` Peter Zijlstra
2013-10-15 13:02   ` Peter Zijlstra
2013-10-15 14:32     ` Peter Zijlstra
2013-10-15 15:07       ` Peter Zijlstra
2013-10-15 15:41         ` Don Zickus
2013-10-16 10:57           ` [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip() Peter Zijlstra
2013-10-16 12:46             ` Don Zickus
2013-10-16 13:31               ` Peter Zijlstra
2013-10-16 13:54                 ` Don Zickus
2013-10-17 11:21                 ` Peter Zijlstra
2013-10-17 13:33                 ` Peter Zijlstra
2013-10-29 14:07                   ` [tip:perf/urgent] perf/x86: Fix NMI measurements tip-bot for Peter Zijlstra
2013-10-16 20:52             ` [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip() Andi Kleen
2013-10-16 21:03               ` Peter Zijlstra
2013-10-16 23:07                 ` Peter Zijlstra
2013-10-17  9:41                   ` Peter Zijlstra
2013-10-17 16:00                     ` Don Zickus
2013-10-17 16:04                       ` Don Zickus
2013-10-17 16:30                         ` Peter Zijlstra
2013-10-17 18:26                           ` Linus Torvalds
2013-10-17 21:08                             ` Peter Zijlstra
2013-10-17 21:11                               ` Peter Zijlstra
2013-10-17 22:01                             ` Peter Zijlstra
2013-10-17 22:27                               ` Linus Torvalds
2013-10-22 21:12                                 ` Peter Zijlstra
2013-10-23  7:09                                   ` Linus Torvalds
2013-10-23 20:48                                     ` Peter Zijlstra
2013-10-24 10:52                                       ` Peter Zijlstra
2013-10-24 13:47                                         ` Don Zickus
2013-10-24 14:06                                           ` Peter Zijlstra
2013-10-25 16:33                                         ` Don Zickus
2013-10-25 17:03                                           ` Peter Zijlstra
2013-10-26 10:36                                           ` Ingo Molnar
2013-10-28 13:19                                             ` Don Zickus
2013-10-29 14:08                                         ` [tip:perf/core] perf/x86: Further optimize copy_from_user_nmi() tip-bot for Peter Zijlstra
2013-10-23  7:44                                   ` [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip() Ingo Molnar
2013-10-17 14:49             ` Don Zickus
2013-10-17 14:51               ` Peter Zijlstra
2013-10-17 15:03                 ` Don Zickus
2013-10-17 15:09                   ` Peter Zijlstra [this message]
2013-10-17 15:11                     ` Peter Zijlstra
2013-10-17 16:50             ` [tip:perf/core] perf/x86: " tip-bot for Peter Zijlstra
2013-10-15 16:22         ` x86, perf: throttling issues with long nmi latencies Don Zickus
2013-10-15 14:36     ` Don Zickus
2013-10-15 14:39       ` Peter Zijlstra

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