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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
	"Xu, Yanfei" <yanfei.xu@windriver.com>,
	Sasha Levin <sashal@kernel.org>,
	rcu@vger.kernel.org
Subject: [PATCH AUTOSEL 5.13 06/19] rcu-tasks: Don't delete holdouts within trc_wait_for_one_reader()
Date: Thu, 22 Jul 2021 23:57:07 -0400	[thread overview]
Message-ID: <20210723035721.531372-6-sashal@kernel.org> (raw)
In-Reply-To: <20210723035721.531372-1-sashal@kernel.org>

From: "Paul E. McKenney" <paulmck@kernel.org>

[ 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>
---
 kernel/rcu/tasks.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 71e9d625371a..fcef5f0c60b8 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -937,7 +937,6 @@ 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;
 	}
-- 
2.30.2


  parent reply	other threads:[~2021-07-23  3:57 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23  3:57 [PATCH AUTOSEL 5.13 01/19] net/802/mrp: fix memleak in mrp_request_join() Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 02/19] net/802/garp: fix memleak in garp_request_join() Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 03/19] net: annotate data race around sk_ll_usec Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 04/19] sctp: move 198 addresses from unusable to private scope Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 05/19] rcu-tasks: Don't delete holdouts within trc_inspect_reader() Sasha Levin
2021-07-23  3:57 ` Sasha Levin [this message]
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 07/19] ipv6: allocate enough headroom in ip6_finish_output2() Sasha Levin
2021-07-23  6:03   ` Vasily Averin
2021-07-28 14:07     ` Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 08/19] nvme-pci: fix multiple races in nvme_setup_io_queues Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 09/19] sfc: ensure correct number of XDP queues Sasha Levin
2021-07-23 10:12   ` Íñigo Huguet
2021-07-23 10:18     ` Íñigo Huguet
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 10/19] drm/ttm: add a check against null pointer dereference Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 11/19] hfs: add missing clean-up in hfs_fill_super Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 12/19] hfs: fix high memory mapping in hfs_bnode_read Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 13/19] hfs: add lock nesting notation to hfs_find_init Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 14/19] firmware: arm_scmi: Fix possible scmi_linux_errmap buffer overflow Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 15/19] firmware: arm_scmi: Fix range check for the maximum number of pending messages Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 16/19] cifs: fix the out of range assignment to bit fields in parse_server_interfaces Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 17/19] iomap: remove the length variable in iomap_seek_data Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 18/19] iomap: remove the length variable in iomap_seek_hole Sasha Levin
2021-07-23  3:57 ` [PATCH AUTOSEL 5.13 19/19] ARM: dts: versatile: Fix up interrupt controller node names Sasha Levin

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