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From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	acme@kernel.org, jolsa@kernel.org, linux-kernel@vger.kernel.org,
	Andi Kleen <ak@linux.intel.com>,
	x86@kernel.org
Subject: Re: [UPDATED PATCH 01/10] x86: Add topology_max_smt_threads()
Date: Sat, 7 May 2016 10:11:33 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1605071011200.3540@nanos> (raw)
In-Reply-To: <20160506172426.GW13997@two.firstfloor.org>

On Fri, 6 May 2016, Andi Kleen wrote:

> For SMT specific workarounds it is useful to know if SMT is active
> on any online CPU in the system. This currently requires a loop
> over all online CPUs.
>     
> Add a global variable that is updated with the maximum number
> of smt threads on any CPU on online/offline, and use it for
> topology_max_smt_threads()
>     
> The single call is easier to use than a loop.
>     
> Not exported to user space because user space already can use
> the existing sibling interfaces to find this out.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

  reply	other threads:[~2016-05-07  8:13 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-05 23:03 Add top down metrics to perf stat Andi Kleen
2016-05-05 23:03 ` [PATCH 01/10] x86: Add topology_max_smt_threads() Andi Kleen
2016-05-06 10:13   ` Peter Zijlstra
2016-05-06 10:47     ` Thomas Gleixner
2016-05-06 17:24       ` [UPDATED PATCH " Andi Kleen
2016-05-07  8:11         ` Thomas Gleixner [this message]
2016-05-12  8:07         ` Ingo Molnar
2016-05-05 23:03 ` [PATCH 02/10] x86, perf: Support sysfs files depending on SMT status Andi Kleen
2016-05-09  9:42   ` Peter Zijlstra
2016-05-09 14:27     ` Andi Kleen
2016-05-09 14:34       ` Peter Zijlstra
2016-05-12  8:05   ` Ingo Molnar
2016-05-05 23:04 ` [PATCH 03/10] x86, perf: Add Top Down events to Intel Core Andi Kleen
2016-05-11 13:23   ` Jiri Olsa
2016-05-11 13:29     ` Peter Zijlstra
2016-05-12  8:10   ` Ingo Molnar
2016-05-05 23:04 ` [PATCH 04/10] x86, perf: Add Top Down events to Intel Atom Andi Kleen
2016-05-05 23:04 ` [PATCH 05/10] x86, perf: Use new topology_max_smt_threads() in HT leak workaround Andi Kleen
2016-05-05 23:04 ` [PATCH 06/10] perf, tools, stat: Avoid fractional digits for integer scales Andi Kleen
2016-05-07 19:10   ` Jiri Olsa
2016-05-07 19:24     ` Andi Kleen
2016-05-11 13:00       ` Jiri Olsa
2016-05-11 16:43         ` Arnaldo Carvalho de Melo
2016-05-20  6:42   ` [tip:perf/urgent] perf " tip-bot for Andi Kleen
2016-05-05 23:04 ` [PATCH 07/10] perf, tools, stat: Scale values by unit before metrics Andi Kleen
2016-05-07 19:14   ` Jiri Olsa
2016-05-10 20:30   ` [tip:perf/core] perf " tip-bot for Andi Kleen
2016-05-05 23:04 ` [PATCH 08/10] perf, tools, stat: Basic support for TopDown in perf stat Andi Kleen
2016-05-05 23:04 ` [PATCH 09/10] perf, tools, stat: Add computation of TopDown formulas Andi Kleen
2016-05-05 23:04 ` [PATCH 10/10] perf, tools, stat: Add extra output of counter values with -vv Andi Kleen
2016-05-12  8:03   ` Jiri Olsa
2016-05-20  0:05     ` Andi Kleen
2016-05-12  7:47 ` Add top down metrics to perf stat Jiri Olsa

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