linux-kernel - Re: [PATCH v2 0/2] Fixes for s3 with parallel bootup

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Date:   Fri, 27 Oct 2023 14:29:24 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Sandipan Das <sandipan.das@....com>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-perf-users@...r.kernel.org>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-kernel@...r.kernel.org>,
        "open list:SUSPEND TO RAM" <linux-pm@...r.kernel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] Fixes for s3 with parallel bootup

On 10/27/2023 14:24, Thomas Gleixner wrote:
> On Thu, Oct 26 2023 at 12:03, Mario Limonciello wrote:
>> Parallel bootup on systems that use x2apic broke suspend to ram.
>> This series ensures x2apic is re-enabled at startup and fixes an exposed
>> pre-emption issue.
> 
> The PMU issue has absolutely nothing to do with parallel bootup.
> 
> Can you please describe stuff coherently?

They are both issues found with S3 testing.
The PMU issue wasn't being observed with cpuhp.parallel=0.