From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Mario Limonciello <superm1@kernel.org>
Cc: "Hans de Goede" <hdegoede@redhat.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Mario Limonciello" <mario.limonciello@amd.com>,
"Perry Yuan" <perry.yuan@amd.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Huang Rui" <ray.huang@amd.com>,
"Gautham R . Shenoy" <gautham.shenoy@amd.com>,
"Rafael J . Wysocki" <rafael@kernel.org>,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"open list:AMD HETERO CORE HARDWARE FEEDBACK DRIVER"
<platform-driver-x86@vger.kernel.org>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@vger.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
"open list:AMD PSTATE DRIVER" <linux-pm@vger.kernel.org>,
"Bagas Sanjaya" <bagasdotme@gmail.com>
Subject: Re: [PATCH v9 01/13] Documentation: x86: Add AMD Hardware Feedback Interface documentation
Date: Mon, 28 Apr 2025 14:39:33 -0400 [thread overview]
Message-ID: <aA_LZZRVnWdv6IdH@char.us.oracle.com> (raw)
In-Reply-To: <20250423014631.3224338-2-superm1@kernel.org>
..snip..
> +Implementation details for Linux
> +--------------------------------
> +
> +The implementation of threads scheduling consists of the following steps:
> +
> +1. A thread is spawned and scheduled to the ideal core using the default
> + heterogeneous scheduling policy.
> +2. The processor profiles thread execution and assigns an enumerated
> + classification ID.
> + This classification is communicated to the OS via logical processor
> + scope MSR.
> +3. During the thread context switch out the operating system consumes the
> + workload(WL) classification which resides in a logical processor scope MSR.
> +4. The OS triggers the hardware to clear its history by writing to an MSR,
> + after consuming the WL classification and before switching in the new thread.
> +5. If due to the classification, ranking table, and processor availability,
> + the thread is not on its ideal processor, the OS will then consider
> + scheduling the thread on its ideal processor (if available).
Can you expand on 5) please? The one patch in this patchset that
touches the process file just does an WRMSR.
next prev parent reply other threads:[~2025-04-28 18:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-23 1:46 [PATCH v9 00/13] Add support for AMD hardware feedback interface Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 01/13] Documentation: x86: Add AMD Hardware Feedback Interface documentation Mario Limonciello
2025-04-28 18:39 ` Konrad Rzeszutek Wilk [this message]
2025-04-28 18:43 ` Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 02/13] MAINTAINERS: Add maintainer entry for AMD Hardware Feedback Driver Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 03/13] x86/msr-index: define AMD heterogeneous CPU related MSR Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 04/13] platform/x86: hfi: Introduce AMD Hardware Feedback Interface Driver Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 05/13] platform/x86: hfi: parse CPU core ranking data from shared memory Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 06/13] platform/x86: hfi: init per-cpu scores for each class Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 07/13] platform/x86: hfi: add online and offline callback support Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 08/13] platform/x86: hfi: add power management callback Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 09/13] x86/process: Clear hardware feedback history for AMD processors Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 10/13] cpufreq/amd-pstate: Disable preferred cores on designs with workload classification Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 11/13] platform/x86/amd: hfi: Set ITMT priority from ranking data Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 12/13] platform/x86/amd: hfi: Add debugfs support Mario Limonciello
2025-04-23 1:46 ` [PATCH v9 13/13] x86/itmt: Add debugfs file to show core priorities Mario Limonciello
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