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Message-ID: <CALPaoCj7JanopjrvZEOvpnNWv_-e2qgre+OLxS5A=3q3hkn0pw@mail.gmail.com>
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
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