On Wed, Mar 6, 2024 at 5:31 PM Joel Fernandes <[email protected]> wrote: > > > > On 3/5/2024 2:57 PM, Uladzislau Rezki (Sony) wrote: > > Fix a below race by not releasing a wait-head from the > > GP-kthread as it can lead for reusing it whereas a worker > > can still access it thus execute newly added callbacks too > > early. > > [...] > There might a way to prevent queuing new work as fast-path optimization, > incase > the CBs per GP will always be < SR_MAX_USERS_WAKE_FROM_GP but I could not > find a > workqueue API that helps there, and work_busy() has comments saying not to > use that.
One way to do this would be to maintain a count of how many CBs are in flight via the worker route, and then fast-path-free the thing if the count is 0. Should I send a patch around something like that? It saves 1 more wakeup per synchronize_rcu() I think. - Joel
