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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OSBPR01MB2037.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: af0ad055-a3ec-433c-c611-08da60cb9911 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2022 10:21:18.8427 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: cpeU+qAtILSEOgraibAg6B0kaMdlM+Keaqh7XWLn9oAMQHrcDJndZoqmQc5XXDkeAXTlmLEUhpJOAkRGNrTyQlsnj/SwzePfn/dLTweC7KE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: OSAPR01MB5107 X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Thanks for the comment. > > > > I am assuming this is ACPI enabled system. > > > > > > Yes, it is ACPI enabled system. > > > > > > > This looks bit hacky in my opinion. Before I explore better way of > > > > adding it, I would like to check if you have explored ways to add > > > > PPTT reading these registers from > > > > UEFI/EDK2 as PPTT has other topology information which you will nee= d > anyways. > > > > That would simplify handling of these cacheinfo sysfs in the > > > > kernel. Let me know what are your thoughts ? > > > > > > The latest firmware of ARM64 machine, FX700 with the A64FX processor > > > does not support PPTT. > > > I think adding PPTT is the best way to generate cacheinfo sysfs. > > > However, it is difficult to modify the firmware to add PPTT, so it > > > is not clear when it will be possible. > > > Therefore, I would like to implement the function in the kernel on > > > the condition that firmware does not support PPTT. > > > > As a bit of a late comment here, I assume you tried injecting the PPTT > > via the initrd (directions in admin-guide/acpi/initrd_table_override.tx= t) then? > > That is one of the usual kernel workarounds for broken/missing ACPI tab= les. > > > > As mentioned above, besides not providing appropriate topology > > information to userspace, not having the PPTT is also possibly causing > > suboptimal scheduling decisions in the kernel itself. > > >=20 > Thanks a lot for the suggestion Jeremy. For some reason, I missed to foll= ow up on > this after my initial response. Anyways I agree injecting PPTT via initrd= is a good > compromise on systems that are shipped without or broken PPTT. I have tes= ted > that to be fully functional on v5.19-rc* on one of the servers shipped wi= th broken > PPTT. I will accept this proposal and try to test injecting PPTT via initrd on my machine. If there are no problems, I remove this patch in the next version.