linux-kernel - RE: [PATCH V6 01/17] perf, x86: Reduce lbr_sel

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Date:	Tue, 4 Nov 2014 01:07:39 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"eranian@...gle.com" <eranian@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"acme@...nel.org" <acme@...nel.org>,
	"jolsa@...hat.com" <jolsa@...hat.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: RE: [PATCH V6 01/17] perf, x86: Reduce lbr_sel_map size

Hi Peter,

Did you get a chance to review the rest of the patch set?

Thanks,
Kan
> 
> On Sun, Oct 19, 2014 at 05:54:56PM -0400, Kan Liang wrote:
> 
> This should still very much have:
> 
> From: Yan, Zheng <zheng.z.yan@...el.com>
> 
> Seeing how you did not write this patch, probably true for all the others
> too, although I've not checked yet.
> 
> > 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>
> > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > Reviewed-by: Stephane Eranian <eranian@...gle.com>
> > ---

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