Re: [tip:perf/core] perf/x86/intel: Add {rd,wr}lbr_{to,from} wrappers

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [tip:perf/core] perf/x86/intel: Add {rd,wr}lbr_{to,from} wrappers
Date	2016-06-29 21:40 +0200
Message-ID	<rPtv3-8eL-1@gated-at.bofh.it> (permalink)
References	<rPtv3-8eL-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Mon, Jun 27, 2016 at 05:56:02AM -0700, tip-bot for Peter Zijlstra wrote:
> +static inline u64 rdlbr_from(unsigned int idx)
> +{
> +	u64 val;
> +
> +	rdmsrl(x86_pmu.lbr_from + idx, val);
> +
> +	return lbr_from_signext_quirk_rd(val);
> +}
> +
> +static inline u64 rdlbr_to(unsigned int idx)
> +{
> +	u64 val;
> +
> +	rdmsrl(x86_pmu.lbr_from + idx, val);

Things work loads better when we use:

	rdmsrl(x86_pmu.lbr_to + idx, val);

:-/

> +
>  	return val;
>  }

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: [tip:perf/core] perf/x86/intel: Add {rd,wr}lbr_{to,from} wrappers Peter Zijlstra <peterz@infradead.org> - 2016-06-29 21:40 +0200

csiph-web