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rcu-tasks: Don't delete holdouts within trc_wait_for_one_reader()

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[ Upstream commit a9ab9cce9367a2cc02a3c7eb57a004dc0b8f380d ]

Invoking trc_del_holdout() from within trc_wait_for_one_reader() is
only a performance optimization because the RCU Tasks Trace grace-period
kthread will eventually do this within check_all_holdout_tasks_trace().
But it is not a particularly important performance optimization because
it only applies to the grace-period kthread, of which there is but one.
This commit therefore removes this invocation of trc_del_holdout() in
favor of the one in check_all_holdout_tasks_trace() in the grace-period
kthread.

Reported-by: "Xu, Yanfei" <yanfei.xu@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-05-25 11:28:40 -07:00 committed by Greg Kroah-Hartman
parent 55ddab2bfd
commit 86cb49e731
1 changed files with 0 additions and 1 deletions
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kernel/rcu/tasks.h
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@ -908,7 +908,6 @@ static void trc_wait_for_one_reader(struct task_struct *t,
// The current task had better be in a quiescent state.
if (t == current) {
t->trc_reader_checked = true;
trc_del_holdout(t);
WARN_ON_ONCE(t->trc_reader_nesting);
return;
}