Date: Tue, 5 Oct 2021 02:28:36 GMT From: Alexander Motin <mav@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: b3fb4c60c50c - stable/13 - sched_ule(4): Fix interactive threads stealing. Message-ID: <202110050228.1952SaAw026558@gitrepo.freebsd.org>
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The branch stable/13 has been updated by mav: URL: https://cgit.FreeBSD.org/src/commit/?id=b3fb4c60c50c217e64069e6fd3f1d2bb3915b43a commit b3fb4c60c50c217e64069e6fd3f1d2bb3915b43a Author: Alexander Motin <mav@FreeBSD.org> AuthorDate: 2021-09-21 19:56:49 +0000 Commit: Alexander Motin <mav@FreeBSD.org> CommitDate: 2021-10-05 02:28:33 +0000 sched_ule(4): Fix interactive threads stealing. In scenarios when first thread in the queue can migrate to specified CPU, but later ones can't runq_steal_from() incorrectly returned NULL. MFC after: 2 weeks (cherry picked from commit bd84094a51c4648a7c97ececdaccfb30bc832096) --- sys/kern/sched_ule.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c index 60f92a16f2e9..53d5a59a3605 100644 --- a/sys/kern/sched_ule.c +++ b/sys/kern/sched_ule.c @@ -1110,10 +1110,12 @@ again: continue; rqh = &rq->rq_queues[bit + (i << RQB_L2BPW)]; TAILQ_FOREACH(td, rqh, td_runq) { - if (first && THREAD_CAN_MIGRATE(td) && - THREAD_CAN_SCHED(td, cpu)) - return (td); - first = td; + if (first) { + if (THREAD_CAN_MIGRATE(td) && + THREAD_CAN_SCHED(td, cpu)) + return (td); + } else + first = td; } } }
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