linux-kernel - Re: Re: [PATCH v2 2/2] KVM: x86: use x86_get

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Message-ID: <20211204104425.GS16608@worktop.programming.kicks-ass.net>
Date:   Sat, 4 Dec 2021 11:44:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     zhenwei pi <pizhenwei@...edance.com>,
        Thomas Gleixner <tglx@...utronix.de>, pbonzini@...hat.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: Re: [PATCH v2 2/2] KVM: x86: use x86_get_freq to get freq for
 kvmclock

On Fri, Dec 03, 2021 at 09:53:53AM +0200, Maxim Levitsky wrote:

> > Perf exposes it, it's not really convenient if you're not using perf,
> > but it can be found there.
> That is good to know! I will check out the source but if you remember,
> is there cli option in perf to show it, or it only uses it for internal
> purposes?

perf tool doesn't expose it I think, it's stuffed in
perf_event_mmap_page::time_* fields, see
include/uapi/linux/perf_event.h, it has comments on.