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by DM4PR11MB6020.namprd11.prod.outlook.com ([fe80::3058:1480:e4ac:5765%6]) with mapi id 15.20.9818.017; Wed, 15 Apr 2026 03:35:03 +0000 Message-ID: Date: Wed, 15 Apr 2026 11:34:51 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [Patch v4 01/22] sched/cache: Introduce infrastructure for cache-aware load balancing To: Vern Hao CC: Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Madadi Vineeth Reddy , "Hillf Danton" , Shrikanth Hegde , "Jianyong Wu" , Yangyu Chen , Tingyin Duan , Len Brown , Aubrey Li , Zhao Liu , Adam Li , Aaron Lu , Tim Chen , Josh Don , Gavin Guo , Qais Yousef , Libo Chen , , Tim Chen , Peter Zijlstra , "Ingo Molnar" , Vincent Guittot , "K Prateek Nayak" , Vern Hao References: <6269a53221b9439b9ca00d18a9d1946fb64d8cff.1775065312.git.tim.c.chen@linux.intel.com> <09cf7ee3-6e27-4505-9692-4b4a4707c8b2@gmail.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <09cf7ee3-6e27-4505-9692-4b4a4707c8b2@gmail.com> 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=?utf-8?B?R3oxWnJlYXNrVzQvL0xJK3UzeUx3ekUwUXBuWUdySHkvblExWFF1UT09?= X-Exchange-RoutingPolicyChecked: X/Cnn8WIakdQMKuUcc2Fs+vxDwJyGl57DzAQ2g74N9L2spL1w7/XgnatornsQ+DTEaQVB3eDTmllfVPEkUm9BzGSsL927WvqJxA2CSPyMh7YVU4jFLr4FR5CibAxlNUmgae8Latep+OSqC7pmju7gzSGQ/qlFYYvUcOYxTLhvGA6d2Ja+RBEnXxMjSn0OSqLVgTqtJFHdwLaJZOFKh/v7Dco3xih3h0hoe8XCX8LALNViLFZeo6xqH0MtiUl11apB2etxNFMO6rQfdIH/3889SpuK4vpNaDhmd5mvO+KHsUVuSR+CEuQx9QQd+iDXdRUiNsf3FRn+D0A9G2Xp6jcJQ== X-MS-Exchange-CrossTenant-Network-Message-Id: 2d760169-c40e-4ad2-e03a-08de9a9ffacc X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6020.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Apr 2026 03:35:03.4696 (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: 4GBDU//vtWpOAOChV5KGFRkrdSoWbKPSGAtR62Lk3O/kD32LqYhzoReCjaG1BbNAFtrs/vO9s4j2QkJ2N9VvYQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB5069 X-OriginatorOrg: intel.com On 4/15/2026 10:06 AM, Vern Hao wrote: > Hi Tim, > [ ... ] >> + >> +static inline >> +void account_mm_sched(struct rq *rq, struct task_struct *p, s64 >> delta_exec) >> +{ >> +    struct sched_cache_time *pcpu_sched; >> +    struct mm_struct *mm = p->mm; >> +    unsigned long epoch; >> + >> +    if (!sched_cache_enabled()) >> +        return; >> + >> +    if (p->sched_class != &fair_sched_class) >> +        return; >> +    /* >> +     * init_task, kthreads and user thread created >> +     * by user_mode_thread() don't have mm. >> +     */ >> +    if (!mm || !mm->sc_stat.pcpu_sched) >> +        return; >> + >> +    pcpu_sched = per_cpu_ptr(p->mm->sc_stat.pcpu_sched, cpu_of(rq)); > > I do some test,  when i see many pids schedstat,  such as  cat proc/xxx/ > schedstat, there will cause a panic，maybe the 'p' is exit or others > reason,  sorry, i dont record these msg.  how about fix it like below. > > pcpu_sched = per_cpu_ptr(mm->sc_stat.pcpu_sched, cpu_of(rq)); > Right, we have also received a report at https://sashiko.dev/#/patchset/cover.1775065312.git.tim.c.chen%40linux.int.com indicating that this issue needs to be fixed. We are working on it. Thanks for the investigation. thanks, Chenyu