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Date:   Sun, 2 Oct 2022 15:02:29 -0700
From:   Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Ricardo Neri <ricardo.neri@intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Ben Segall <bsegall@google.com>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Len Brown <len.brown@intel.com>, Mel Gorman <mgorman@suse.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Valentin Schneider <vschneid@redhat.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, "Tim C . Chen" <tim.c.chen@intel.com>
Subject: Re: [RFC PATCH 23/23] x86/process: Reset hardware history in context
 switch
Message-ID: <20221002220229.GA17545@ranerica-svr.sc.intel.com>
References: <20220909231205.14009-1-ricardo.neri-calderon@linux.intel.com>
 <20220909231205.14009-24-ricardo.neri-calderon@linux.intel.com>
 <YzLySV4545F0MKSl@hirez.programming.kicks-ass.net>
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On Tue, Sep 27, 2022 at 02:53:29PM +0200, Peter Zijlstra wrote:
> On Fri, Sep 09, 2022 at 04:12:05PM -0700, Ricardo Neri wrote:
> > Reset the classification history of the current task when switching to
> > the next task. Hardware will start anew the classification of the next
> > running task.
> 
> Please quantify the cost of this HRESET instruction.

Sure Peter. I will.

Thanks and BR,
Ricardo