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 5CslqDuK 0ONFqVrd1BN4vEySJqz4w/TxaQ0ifKgfaXnlEVwjGhlx3G4o4FxvF/5NC90QSutpUy4yMmN+/TE8YJ2JyASFHemnWLGSUlVK6wD/IMT4zjdk28rfGbmU7n0cEM4UNHu2I8mex0YTAiuCRRiDwWKuObnGo5AXPY8MusYZEvFO293fVRkNLTIhoXAbdCThWuzfgw4qwnmezRofAQvQmTNM+p+vYOxNTsCaIat0oQH5bzuC6yWUXOMT92lzn3qUmjvlJYbYwm0kAKN8GFlbZmZ5nQg4U9g7xiRzh4r4sliD2vkxoUgMgzp4X3aVI3PsgHI/tvYXihzOlZEnIL9aq1QIRF5UCNN6LIMBMRQyf9ON7s2nVCOFZPK795yw+skOmLVJCTPr/V9I+ndpCpxBdHOUNQVlf5AUj/OWzIjC0wL0skXVI0C0SitLSbQwDP7o78snSgehlL6XAt6TJj7eb83OZPukW9lV42K/0GVcv X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2025-02-24 08:28, Gabriele Monaco wrote: [...] > diff --git a/kernel/rseq.c b/kernel/rseq.c > index 2cb16091ec0ae..936863fe7eb37 100644 > --- a/kernel/rseq.c > +++ b/kernel/rseq.c > @@ -419,6 +419,7 @@ void __rseq_handle_notify_resume(struct ksignal *ksig, struct pt_regs *regs) > } > if (unlikely(rseq_update_cpu_node_id(t))) > goto error; > + task_queue_mm_cid(t); Given that task_queue_mm_cid() will be called quite frequently from __rseq_handle_notify_resume, perhaps it would be best to move at least the portion responsible for checks (including the time_before()) to include/linux/sched.h to eliminate a function call from the fast path. > return; > > error: [...] > -void task_tick_mm_cid(struct rq *rq, struct task_struct *curr) > +void task_queue_mm_cid(struct task_struct *curr) > { > - struct callback_head *work = &curr->cid_work; > + struct work_struct *work = &curr->mm->cid_work; > unsigned long now = jiffies; > > - if (!curr->mm || (curr->flags & (PF_EXITING | PF_KTHREAD)) || > - work->next != work) > + if (!curr->mm || (curr->flags & (PF_EXITING | PF_KTHREAD))) > return; > if (time_before(now, READ_ONCE(curr->mm->mm_cid_next_scan))) > return; > > - /* No page allocation under rq lock */ > - task_work_add(curr, work, TWA_RESUME); > + /* Ensure the mm exists when we run. */ > + mmgrab(curr->mm); > + queue_work(system_unbound_wq, work); > } Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com