Messages in this thread Patch in this message | | | Date | Wed, 30 Jun 2021 13:47:23 -0000 | From | "tip-bot2 for Paul E. McKenney" <> | Subject | [tip: core/rcu] rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states |
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The following commit has been merged into the core/rcu branch of tip:
Commit-ID: cf868c2af244417ed276ba7f716b980841a71340 Gitweb: https://git.kernel.org/tip/cf868c2af244417ed276ba7f716b980841a71340 Author: Paul E. McKenney <paulmck@kernel.org> AuthorDate: Wed, 24 Mar 2021 17:08:48 -07:00 Committer: Paul E. McKenney <paulmck@kernel.org> CommitterDate: Tue, 18 May 2021 10:54:51 -07:00
rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states
Heavy networking load can cause a CPU to execute continuously and indefinitely within ksoftirqd, in which case there will be no voluntary task switches and thus no RCU-tasks quiescent states. This commit therefore causes the exiting rcu_softirq_qs() to provide an RCU-tasks quiescent state.
This of course means that __do_softirq() and its callers cannot be invoked from within a tracing trampoline.
Reported-by: Toke Høiland-Jørgensen <toke@redhat.com> Tested-by: Toke Høiland-Jørgensen <toke@redhat.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> --- kernel/rcu/tree.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 8e78b24..f4daa4e 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -242,6 +242,7 @@ void rcu_softirq_qs(void) { rcu_qs(); rcu_preempt_deferred_qs(current); + rcu_tasks_qs(current, false); } /*
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