linux-kernel - Re: [PATCH v2 4/4] perf script: enable printing of branch stack

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Date:	Mon, 31 Aug 2015 10:05:35 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, jolsa@...hat.com,
	namhyung@...nel.org, kan.liang@...el.com, dsahern@...il.com,
	adrian.hunter@...el.com
Subject: Re: [PATCH v2 4/4] perf script: enable printing of branch stack

>  $ perf script -F ip,brstack
>   5d3000 0x401aa0/0x5d2000/M/-/-/-/0 ...
> 
>  $ perf script -F ip,brstacksym
>   4011e0 noploop+0x0/noploop+0x0/P/-/-/0

That's a weird format that's hard to parse with standard tools like
awk, and also for humans. How about separating with spaces?

> @@ -175,6 +175,16 @@ OPTIONS
>  	Finally, a user may not set fields to none for all event types.
>  	i.e., -f "" is not allowed.
>  
> +	The brstack output includes branch related information with raw addresses using the
> +	/v/v/v/v/ syntax in the following order:
> +	FROM: branch source instruction
> +	TO  : branch target instruction
> +        M/P/-: M=branch target mispredicted or branch direction was mispredicted, P=target predicted or direction predicted, -=not supported
> +	X/- : X=branch inside a transactional region, -=not in transaction region or not supported
> +	A/- : A=TSX abort entry, -=not aborted region or not supported

Need to describe cycles here too.

The rest looks good to me. Should probably add brstacksrcline too, but that
can be done later.

-Andi
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