> -----Original Message----- > From: Lukasz Wojciechowski <[email protected]> > Sent: Thursday, April 30, 2020 5:32 AM > To: Phil Yang <[email protected]>; Harry van Haaren > <[email protected]>; Jerin Jacob > <[email protected]> > Cc: [email protected]; [email protected]; nd <[email protected]> > Subject: Re: [dpdk-dev] [PATCH] eal: fix lcore state bug > > Hi Phil, > > W dniu 29.04.2020 o 17:07, Phil Yang pisze: > > Hi Lukasz, > > > >> -----Original Message----- > >> From: dev <[email protected]> On Behalf Of Lukasz Wojciechowski > >> Sent: Tuesday, April 28, 2020 9:22 AM > >> To: Harry van Haaren <[email protected]>; Jerin Jacob > >> <[email protected]> > >> Cc: [email protected]; [email protected]; > [email protected] > >> Subject: [dpdk-dev] [PATCH] eal: fix lcore state bug > >> > >> The rte_service_lcore_reset_all function stops execution of services > >> on all lcores and switches them back from ROLE_SERVICE to ROLE_RTE. > >> However the thread loop for slave lcores (eal_thread_loop) distincts > these > >> roles to set lcore state after processing delegated function. > >> It sets WAIT state for ROLE_SERVICE, but FINISHED for ROLE_RTE. > >> So changing the role to RTE before stopping work in slave lcores > >> causes lcores to end in FINISHED state. That is why the rte_eal_lcore_wait > >> must be run after rte_service_lcore_reset_all to bring back lcores to > >> launchable (WAIT) state. > > Is that make sense to call rte_eal_mp_wait_lcore() inside > rte_serice_lcore_reset_all() ? > > yeah, I thought about it and in my opinion the answer is no, because if > the function run on slave lcore is in FINISHED state it means, that > someone can still read the value returned by the function and the only > one who can be interested in the value is the one that delegated the > service. > > If we will wait for lcores to end their jobs, read the values and switch > them to WAIT state, the values will be lost. The application might need > to read them. We cannot take this possibility from it.
Yeah. I think that is a good point. Reviewed-by: Phil Yang <[email protected]> > > > <snip> > > > > Thanks, > > Phil > > -- > > Lukasz Wojciechowski > Principal Software Engineer > > Samsung R&D Institute Poland > Samsung Electronics > Office +48 22 377 88 25 > [email protected]
