linux-kernel - Re: [PATCH] perf report: auto-detect branch stack sampling mode

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Message-ID: <20120305154753.GA14604@elte.hu>
Date:	Mon, 5 Mar 2012 16:47:53 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, dsahern@...il.com, ravitillo@....gov,
	khandual@...ux.vnet.ibm.com, asharma@...com,
	robert.richter@....com, ming.m.lin@...el.com,
	vweaver1@...s.utk.edu, andi@...stfloor.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] perf report: auto-detect branch stack sampling mode


Another usability bug of the new branch sampling feature is that 
typing the obvious:

  $ perf record -b ./myprog

does not do the obvious thing and default to 'any' but throws a 
*very* unhelpful generic perf error:

 usage: perf record [<options>] [<command>]
    or: perf record [<options>] -- <command> [<options>]

 ...

Really, we should do better than this. Only people who *want* to 
specify finer LBR filters should be forced to specify them.

Thanks,

	Ingo
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