linux-kernel - Re: [PATCH V5 01/16] perf, x86: Reduce lbr_sel

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Message-ID: <20140924105024.GW6758@twins.programming.kicks-ass.net>
Date:	Wed, 24 Sep 2014 12:50:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	kan.liang@...el.com
Cc:	eranian@...gle.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
	paulus@...ba.org, acme@...nel.org, ak@...ux.intel.com,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [PATCH V5 01/16] perf, x86: Reduce lbr_sel_map size

On Wed, Sep 10, 2014 at 10:08:58AM -0400, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>

Uhm, I'm very sure Zheng Yan wrote this.. you cannot just add your from
on that.

> 
> The index of lbr_sel_map is bit value of perf branch_sample_type.
> PERF_SAMPLE_BRANCH_MAX is 1024 at present, so each lbr_sel_map uses
> 4096 bytes. By using bit shift as index, we can reduce lbr_sel_map
> size to 40 bytes. This patch defines 'bit shift' for branch types,
> and use 'bit shift' to define lbr_sel_maps.
> 
> Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>
> Reviewed-by: Stephane Eranian <eranian@...gle.com>

And you're sending me this patch, so I would have expected a SoB from
you here.
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