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

From: Andi Kleen
Date: Mon Aug 31 2015 - 13:05:41 EST

> $ 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.

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