linux-kernel - Re: [PATCH 01/12] perf_events: add generic taken branch sampling support (v2)

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Date:	Mon, 05 Dec 2011 23:14:20 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, acme@...hat.com,
	ming.m.lin@...el.com, andi@...stfloor.org, robert.richter@....com,
	ravitillo@....gov, will.deacon@....com, paulus@...ba.org,
	benh@...nel.crashing.org, rth@...ddle.net, ralf@...ux-mips.org,
	davem@...emloft.net, lethal@...ux-sh.org
Subject: Re: [PATCH 01/12] perf_events: add generic taken branch sampling
 support (v2)

On Fri, 2011-10-14 at 14:37 +0200, Stephane Eranian wrote:
> +#define PERF_SAMPLE_BRANCH_PLM_ALL \
> +       (PERF_SAMPLE_BRANCH_USER|\
> +        PERF_SAMPLE_BRANCH_KERNEL) 

This PLM thing keeps popping up all over, I'm sure it stands for
something, but for now it just hurts my eyes.


> +               /* at least one branch bit must be set */
> +               if (!(mask & ~PERF_SAMPLE_BRANCH_PLM_ALL))
> +                       return -EINVAL;
> 
Why? we can create counters with exclude_user && exclude_kernel as well,
I mean, they're useless, but its perfectly valid.
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