From: Borislav Petkov <bp@alien8.de>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Thomas Gleixner <tglx@linutronix.de>,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, vince@deater.net,
eranian@google.com, Arnaldo Carvalho de Melo <acme@infradead.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>
Subject: Re: [PATCH v0 2/3] perf/x86/intel/pt: Export cpu frequency ratios needed by PT decoders
Date: Tue, 3 May 2016 15:53:36 +0200 [thread overview]
Message-ID: <20160503135336.GF27540@pd.tnic> (raw)
In-Reply-To: <1461857746-31346-3-git-send-email-alexander.shishkin@linux.intel.com>
On Thu, Apr 28, 2016 at 06:35:45PM +0300, Alexander Shishkin wrote:
> In order for Intel PT decoders to infer correct crystal clock and bus
> frequencies that are required to correctly decode timing information
> from a PT stream (MTC and CBR packets), export them as sysfs attributes:
>
> * max_nonturbo_ratio: ratio between the invariant TSC and base clock;
> * tsc_art_ratio: TSC to core crystal clock ratio.
I guess new sysfs nodes need to be documented:
Documentation/ABI/...
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2016-05-03 13:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-28 15:35 [PATCH v0 0/3] perf, pt: Intel PT updates Alexander Shishkin
2016-04-28 15:35 ` [PATCH v0 1/3] perf/x86/intel/pt: Convert ACCESS_ONCE()s Alexander Shishkin
2016-05-05 9:49 ` [tip:perf/core] " tip-bot for Alexander Shishkin
2016-04-28 15:35 ` [PATCH v0 2/3] perf/x86/intel/pt: Export cpu frequency ratios needed by PT decoders Alexander Shishkin
2016-04-28 15:55 ` Alexander Shishkin
2016-05-05 9:48 ` [tip:perf/core] perf/x86/intel/pt: Export CPU " tip-bot for Alexander Shishkin
2016-05-03 13:53 ` Borislav Petkov [this message]
2016-04-28 15:35 ` [PATCH v0 3/3] perf, x86: Bypass PT vs LBR exclusivity if the core supports it Alexander Shishkin
2016-05-05 9:48 ` [tip:perf/core] perf/x86/intel/pt: Bypass PT vs. " tip-bot for Alexander Shishkin
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