From: Peter Zijlstra <peterz@infradead.org>
To: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"ming.m.lin@intel.com" <ming.m.lin@intel.com>,
"ak@linux.intel.com" <ak@linux.intel.com>
Subject: Re: [PATCH] perf_events: fix and improve x86 event scheduling
Date: Thu, 10 Nov 2011 19:41:59 +0100 [thread overview]
Message-ID: <1320950519.13800.41.camel@twins> (raw)
In-Reply-To: <20111110180308.GD15738@erda.amd.com>
On Thu, 2011-11-10 at 19:03 +0100, Robert Richter wrote:
> But this algorithm does not work for all cases and does not solve the
> problem in general.
Yeah, the problem in general is O(n!) no O(n^3) algorithm can compute
the optimal solution for n>3 or so.
I think the goal is to keep the 'normal' case O(n^2) but try and suck
less for the corner cases without degenerating into a full blown O(n!).
So I think we want an amortized O(n^2) with an upper bound well below
O(n!).
next prev parent reply other threads:[~2011-11-10 18:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-07 11:01 [PATCH] perf_events: fix and improve x86 event scheduling Stephane Eranian
2011-11-07 11:55 ` Peter Zijlstra
2011-11-07 12:10 ` Peter Zijlstra
2011-11-07 13:52 ` Stephane Eranian
2011-11-07 14:56 ` Peter Zijlstra
2011-11-10 14:37 ` Peter Zijlstra
2011-11-10 15:09 ` Stephane Eranian
2011-11-10 16:41 ` Gleb Natapov
2011-11-10 16:59 ` Stephane Eranian
2011-11-10 17:13 ` Gleb Natapov
2011-11-10 16:59 ` Robert Richter
2011-11-10 18:31 ` Peter Zijlstra
2011-11-10 18:03 ` Robert Richter
2011-11-10 18:41 ` Peter Zijlstra [this message]
2011-11-10 18:52 ` Peter Zijlstra
2011-11-11 14:29 ` Robert Richter
2011-11-14 17:51 ` [PATCH v3 0/2] perf, x86: handle overlapping counters Robert Richter
2011-11-14 17:51 ` [PATCH v3 1/2] perf, x86: Implement event scheduler helper functions Robert Richter
2011-11-16 16:02 ` Peter Zijlstra
2011-11-16 19:23 ` Robert Richter
2011-11-14 17:51 ` [PATCH v3 2/2] perf, x86: Fix event scheduler for constraints with overlapping counters Robert Richter
2011-11-14 12:55 ` [PATCH] perf_events: fix and improve x86 event scheduling Stephane Eranian
2011-11-14 14:12 ` Peter Zijlstra
2011-11-14 14:26 ` Stephane Eranian
2011-11-14 16:00 ` Peter Zijlstra
2011-11-14 17:39 ` Stephane Eranian
2011-11-14 21:43 ` Peter Zijlstra
2011-11-16 10:28 ` Stephane Eranian
2011-11-14 22:16 ` Peter Zijlstra
2011-11-16 10:06 ` Stephane Eranian
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