linux-kernel - Re: [PATCH] perf: Improve PT documentation slightly

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Date:   Wed, 14 Oct 2020 13:15:21 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     linux-kernel@...r.kernel.org, jolsa@...nel.org,
        adrian.hunter@...el.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf: Improve PT documentation slightly

Em Tue, Oct 13, 2020 at 08:53:46PM -0700, Andi Kleen escreveu:
> Document the higher level --insn-trace etc. perf script options.
> 
> Include the howto how to build xed into the manpage

Thanks, applied.
 
> Cc: adrian.hunter@...el.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/Documentation/perf-intel-pt.txt | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-intel-pt.txt b/tools/perf/Documentation/perf-intel-pt.txt
> index d5a266d7f15b..cc2a8b2be31a 100644
> --- a/tools/perf/Documentation/perf-intel-pt.txt
> +++ b/tools/perf/Documentation/perf-intel-pt.txt
> @@ -112,6 +112,32 @@ The flags are "bcrosyiABEx" which stand for branch, call, return, conditional,
>  system, asynchronous, interrupt, transaction abort, trace begin, trace end, and
>  in transaction, respectively.
>  
> +perf script also supports higher level ways to dump instruction traces:
> +
> +	perf script --insn-trace --xed
> +
> +Dump all instructions. This requires installing the xed tool (see XED below)
> +Dumping all instructions in a long trace can be fairly slow. It is usually better
> +to start with higher level decoding, like
> +
> +	perf script --call-trace
> +
> +or
> +
> +	perf script --call-ret-trace
> +
> +and then select a time range of interest. The time range can then be examined
> +in detail with
> +
> +	perf script --time starttime,stoptime --insn-trace --xed
> +
> +While examining the trace it's also useful to filter on specific CPUs using
> +the -C option
> +
> +	perf script --time starttime,stoptime --insn-trace --xed -C 1
> +
> +Dump all instructions in time range on CPU 1.
> +
>  Another interesting field that is not printed by default is 'ipc' which can be
>  displayed as follows:
>  
> @@ -1093,6 +1119,10 @@ To display PEBS events from the Intel PT trace, use the itrace 'o' option e.g.
>  
>  	perf script --itrace=oe
>  
> +XED
> +---
> +
> +include::build-xed.txt[]
>  
>  SEE ALSO
>  --------
> -- 
> 2.28.0
> 

-- 

- Arnaldo