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GRwgZ19uTb1SO9hQ= 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 2025-04-09 10:03, Peter Zijlstra wrote: > On Tue, Mar 11, 2025 at 07:28:45AM +0100, Gabriele Monaco wrote: >> +static inline void rseq_preempt_from_tick(struct task_struct *t) >> +{ >> + u64 rtime = t->se.sum_exec_runtime - t->se.prev_sum_exec_runtime; >> + >> + if (rtime > RSEQ_UNPREEMPTED_THRESHOLD) >> + rseq_preempt(t); >> +} > > This confused me. > > The goal seems to be to tickle __rseq_handle_notify_resume() so it'll > end up queueing that work thing. But why do we want to set PREEMPT_BIT > here? In that scenario, we trigger (from tick) the fact that we may recompact the mm_cid, and thus need to update the rseq mm_cid field before returning to userspace. Changing the value of the mm_cid field while userspace is within a rseq critical section should abort the critical section, because the rseq critical section should be able to expect the mm_cid to be invariant for the whole c.s.. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com