linux-kernel - Re: [PATCH v1 1/8] perf/x86: add support to mask counters from host

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Message-ID: <20181105182015.GP6218@tassilo.jf.intel.com>
Date:   Mon, 5 Nov 2018 10:20:15 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Wang, Wei W" <wei.w.wang@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "Xu, Like" <like.xu@...el.com>
Subject: Re: [PATCH v1 1/8] perf/x86: add support to mask counters from host


I ran into a similar problem with my PEBS virtualization patchkit.

My solution was: basically schedule as normal, but tell the scheduler to
force allocate a counter on a specific index.  It can be done
only with a few lines of change in the scheduler code.

-Andi