From: Peter Zijlstra <peterz@infradead.org>
To: Huang Rui <ray.huang@amd.com>
Cc: "Borislav Petkov" <bp@suse.de>,
"Andy Lutomirski" <luto@amacapital.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Len Brown" <lenb@kernel.org>,
"John Stultz" <john.stultz@linaro.org>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org, x86@kernel.org,
"Fengguang Wu" <fengguang.wu@intel.com>,
"Aaron Lu" <aaron.lu@intel.com>,
"Suravee Suthikulanit" <suravee.suthikulpanit@amd.com>,
"Tony Li" <tony.li@amd.com>, "Ken Xue" <ken.xue@amd.com>
Subject: Re: [PATCH v2 3/4] x86, mwaitt: introduce mwaix delay with a configurable timer
Date: Tue, 9 Jun 2015 10:31:03 +0200 [thread overview]
Message-ID: <20150609083103.GO3644@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1433819621-15093-4-git-send-email-ray.huang@amd.com>
On Tue, Jun 09, 2015 at 11:13:40AM +0800, Huang Rui wrote:
> MWAITX can enable a timer and a corresponding timer value specified in SW
> P0 clocks. The SW P0 frequency is the same with TSC. The timer provides an
> upper bound on how long the instruction waits before exiting.
>
> The implementation of delay function in kernel can lerverage the timer of
> MWAITX. This patch provides a new method (delay_mwaitx) to measure delay
> time.
But does this actually default to mwaitx delay on capable hardware? If
you need to boot with that parameter it means nobody is ever going to
use this.
next prev parent reply other threads:[~2015-06-09 8:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-09 3:13 [PATCH v2 0/4] x86, mwaitt: introduce AMD mwaitt support Huang Rui
2015-06-09 3:13 ` [PATCH v2 1/4] x86, mwaitt: add monitorx and mwaitx instruction Huang Rui
2015-06-09 8:23 ` Peter Zijlstra
2015-06-09 9:48 ` Huang Rui
2015-06-09 10:05 ` Borislav Petkov
2015-06-09 16:44 ` Andy Lutomirski
2015-06-09 17:06 ` Borislav Petkov
2015-06-10 2:40 ` Huang Rui
2015-06-09 3:13 ` [PATCH v2 2/4] x86, mwaitt: make delay method configurable Huang Rui
2015-06-09 9:05 ` Borislav Petkov
2015-06-09 9:31 ` Peter Zijlstra
2015-06-09 10:03 ` Huang Rui
2015-06-09 10:08 ` Peter Zijlstra
2015-06-09 10:15 ` Huang Rui
2015-06-09 10:08 ` Borislav Petkov
2015-06-09 3:13 ` [PATCH v2 3/4] x86, mwaitt: introduce mwaix delay with a configurable timer Huang Rui
2015-06-09 8:31 ` Peter Zijlstra [this message]
2015-06-09 10:10 ` Huang Rui
2015-06-09 9:29 ` Peter Zijlstra
2015-06-09 10:59 ` Huang Rui
2015-06-09 16:46 ` Andy Lutomirski
2015-06-09 17:13 ` Peter Zijlstra
2015-06-09 17:55 ` Andy Lutomirski
2015-06-09 18:43 ` Borislav Petkov
2015-06-09 18:55 ` Andy Lutomirski
2015-06-12 8:42 ` Borislav Petkov
2015-06-12 23:15 ` Andy Lutomirski
2015-06-13 8:48 ` Borislav Petkov
2015-06-09 3:13 ` [PATCH v2 4/4] x86, mwaitt: add documents of delay option Huang Rui
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