linux-kernel - Re: [PATCH] x86/resctrl: Fix event counts regression in reused RMIDs

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Date:   Thu, 8 Dec 2022 10:45:24 +0100
From:   Peter Newman <peternewman@...gle.com>
To:     "Yu, Fenghua" <fenghua.yu@...el.com>
Cc:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        James Morse <james.morse@....com>,
        Shaopeng Tan <tan.shaopeng@...itsu.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Eranian, Stephane" <eranian@...gle.com>
Subject: Re: [PATCH] x86/resctrl: Fix event counts regression in reused RMIDs

Hi Fenghua,

On Wed, Dec 7, 2022 at 8:26 PM Yu, Fenghua <fenghua.yu@...el.com> wrote:
> > Fixes: 1d81d15db39c ("x86/resctrl: Move mbm_overflow_count() into
> > resctrl_arch_rmid_read()")
>
> Are you sure the patch fixes 1d81d15db39c? This commit is just a refactoring patch and doesn't change resctrl_arch_reset_rmid().

Yes, the breaking change was actually in __mon_event_count(). That
patch removes the initialization of mbm_state::prev_msr and switches
to using arch_mbm_state::prev_msr.

-Peter