From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: acme@kernel.org, jolsa@kernel.org, linux-kernel@vger.kernel.org,
namhyung@kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 5/9] perf, tools: Compute IPC and basic block cycles for annotate
Date: Thu, 30 Jun 2016 10:53:24 +0200 [thread overview]
Message-ID: <20160630085324.GF30935@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1437233094-12844-6-git-send-email-andi@firstfloor.org>
On Sat, Jul 18, 2015 at 08:24:50AM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
>
> Compute the IPC and the basic block cycles for the annotate display.
>
> IPC is computed by counting the instructions, and then dividing the
> accounted cycles by that count.
>
> The actual IPC computation can only be done at annotate time,
> because we need to parse the objdump output first to know
> the number of instructions in the basic block.
>
> The cycles/IPC are also put into the perf function annotation
> so that the display code can show them.
>
> Again basic block overlaps are not handled, with the longest winning,
> but there are some heuristics to hide the IPC when the longest is not
> the most common.
I'm looking at basic block support, but this all seems to depend on the
cycles stuff. Can we get the basic block stuff without that?
I'm looking to plot the hottest path through a branchy function.
next prev parent reply other threads:[~2016-06-30 9:40 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-18 15:24 Cycles annotation support for perf tools v3 Andi Kleen
2015-07-18 15:24 ` [PATCH 1/9] perf, tools: Add tools support for cycles, weight branch_info field Andi Kleen
2015-08-07 7:19 ` [tip:perf/core] perf tools: Add " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 2/9] perf, tools, report: Add flag for non ANY branch mode Andi Kleen
2015-08-07 7:19 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 3/9] perf, tools, report: Add infrastructure for a cycles histogram Andi Kleen
2015-08-07 7:20 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 4/9] perf, tools, report: Add processing for cycle histograms Andi Kleen
2015-08-07 7:20 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 5/9] perf, tools: Compute IPC and basic block cycles for annotate Andi Kleen
2015-08-07 7:20 ` [tip:perf/core] perf annotate: Compute IPC and basic block cycles tip-bot for Andi Kleen
2016-06-30 8:53 ` Peter Zijlstra [this message]
2016-07-02 20:38 ` [PATCH 5/9] perf, tools: Compute IPC and basic block cycles for annotate Andi Kleen
2015-07-18 15:24 ` [PATCH 6/9] perf, tools, annotate: Finally display IPC and cycle accounting Andi Kleen
2015-08-07 7:21 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 7/9] perf, tools, top: Add branch annotation code to top Andi Kleen
2015-08-07 7:21 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 8/9] perf, tools, report: Display cycles in branch sort mode Andi Kleen
2015-08-07 7:21 ` [tip:perf/core] perf " tip-bot for Andi Kleen
2015-07-18 15:24 ` [PATCH 9/9] test patch: Add fake branch cycles to input data in report/top Andi Kleen
2015-08-06 19:44 ` Cycles annotation support for perf tools v3 Arnaldo Carvalho de Melo
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