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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB4107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c8cf5345-a0a1-4414-1069-08db0ad8456f X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Feb 2023 20:00:19.6864 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: FYUvfhuZ1+SlmTq+XPTCBg2vJJFPVI5Hp1IRO3Izeq/YoxK7PEv+RmoGvlpJPT6nVkKGBZIPDxoB57hMCdW4tw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6651 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >> static inline void update_sd_lb_stats(struct lb_env *env, struct >> sd_lb_stats *sds) { >> - struct sched_domain *child =3D env->sd->child; >> struct sched_group *sg =3D env->sd->groups; >> struct sg_lb_stats *local =3D &sds->local_stat; >> struct sg_lb_stats tmp_sgs; >> @@ -10045,9 +10044,11 @@ static inline void update_sd_lb_stats(struct >lb_env *env, struct sd_lb_stats *sd >> sg =3D sg->next; >> } while (sg !=3D env->sd->groups); >> >> - /* Tag domain that child domain prefers tasks go to siblings first */ >> - sds->prefer_sibling =3D child && child->flags & SD_PREFER_SIBLING; >> - >> + /* >> + * Tag domain that @env::sd prefers to spread excess tasks among >> + * sibling sched groups. >> + */ >> + sds->prefer_sibling =3D env->sd->flags & SD_PREFER_SIBLING; >> >This does help fix the issue that non-SMT core fails to pull task from bus= y SMT- >cores. >And it also semantically changes the definination of prefer sibling. Do we= also >need to change this: > if ((sd->flags & SD_ASYM_CPUCAPACITY) && sd->child) > sd->child->flags &=3D ~SD_PREFER_SIBLING; might be: > if ((sd->flags & SD_ASYM_CPUCAPACITY)) > sd->flags &=3D ~SD_PREFER_SIBLING; > Yu, I think you are talking about the code in sd_init()=20 where SD_PREFER_SIBLING is first set to "ON" and updated depending on SD_ASYM_CPUCAPACITY. The intention of the= code is if there are cpus in the scheduler domain that have differing cpu capaci= ties, we do not want to do spreading among the child groups in the sched domain. So the flag is turned off in the child group level and not the parent level= . But with your above change, the parent's flag is turned off, leaving the child level flag on.=20 This moves the level where spreading happens (SD_PREFER_SIBLING on)=20 up one level which is undesired (see table below). SD_PREFER_SIBLING after init =20 original code proposed SD Level SD_ASYM_CPUCAPACITY =20 root ON ON OFF (note: SD_PREFER_SIBLING unused at this level) = =09 first level ON OFF OFF second level OFF OFF ON third level OFF ON ON Tim