* [PATCH 2/9] rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check
[not found] <20230315194349.10798-1-joel@joelfernandes.org>
@ 2023-03-15 19:43 ` Joel Fernandes (Google)
0 siblings, 0 replies; only message in thread
From: Joel Fernandes (Google) @ 2023-03-15 19:43 UTC (permalink / raw)
To: linux-kernel, Steven Rostedt, Masami Hiramatsu,
Frederic Weisbecker, Thomas Gleixner, Ingo Molnar,
Paul E. McKenney
Cc: Zqiang, Anna-Maria Behnsen, Frederic Weisbecker, Joel Fernandes,
linux-trace-kernel
From: Zqiang <qiang1.zhang@intel.com>
This commit adds checks for the TICK_DEP_MASK_RCU_EXP bit, thus enabling
RCU expedited grace periods to actually force-enable scheduling-clock
interrupts on holdout CPUs.
Fixes: df1e849ae455 ("rcu: Enable tick for nohz_full CPUs slow to provide expedited QS")
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@linutronix.de>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
include/trace/events/timer.h | 3 ++-
kernel/time/tick-sched.c | 5 +++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index 2e713a7d9aa3..3e8619c72f77 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -371,7 +371,8 @@ TRACE_EVENT(itimer_expire,
tick_dep_name(PERF_EVENTS) \
tick_dep_name(SCHED) \
tick_dep_name(CLOCK_UNSTABLE) \
- tick_dep_name_end(RCU)
+ tick_dep_name(RCU) \
+ tick_dep_name_end(RCU_EXP)
#undef tick_dep_name
#undef tick_dep_mask_name
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index b0e3c9205946..ba2ac1469d47 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -281,6 +281,11 @@ static bool check_tick_dependency(atomic_t *dep)
return true;
}
+ if (val & TICK_DEP_MASK_RCU_EXP) {
+ trace_tick_stop(0, TICK_DEP_MASK_RCU_EXP);
+ return true;
+ }
+
return false;
}
--
2.40.0.rc1.284.g88254d51c5-goog
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