linux-kernel - Re: [PATCH 9/9] perf c2c report: Add cacheline address count column

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Date:   Fri, 9 Mar 2018 11:56:43 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 9/9] perf c2c report: Add cacheline address count column

Em Fri, Mar 09, 2018 at 11:14:42AM +0100, Jiri Olsa escreveu:
> Adding the 'PA cnt' column grouped under data cacheline address.
> 
> It shows how many times the physical addresses changed for the
> hist entry. It does not show the number of different physical
> addresses for entry, because we don't store those. We only track
> the number of times we got different address than we currently
> hold, which is not expensive and gives similar info.
> 
>   $ perf c2c report --stdio
> 
>   #        ----------- Cacheline ----------    Total      Tot  ----- LLC Load Hitm -----
>   # Index             Address  Node  PA cnt  records     Hitm    Total      Lcl      Rmt
>   # .....  ..................  ....  ......  .......  .......  .......  .......  .......
>   #


I'm adding this to the docs, ack?

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index cba16d8a970e..f4a280428e28 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -127,7 +127,7 @@ OPTIONS
 
 	If the --mem-mode option is used, the following sort keys are also available
 	(incompatible with --branch-stack):
-	symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline.
+	symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline, dcacheline_count.
 
 	- symbol_daddr: name of data symbol being executed on at the time of sample
 	- dso_daddr: name of library or module containing the data being executed
@@ -137,6 +137,7 @@ OPTIONS
 	- mem: type of memory access for the data at the time of the sample
 	- snoop: type of snoop (if any) for the data at the time of the sample
 	- dcacheline: the cacheline the data address is on at the time of the sample
+	- dcacheline_count: the number of physical addresses sampled for this dcacheline
 	- phys_daddr: physical address of data being executed on at the time of sample
 
 	And the default sort keys are changed to local_weight, mem, sym, dso,