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Zqiang 4f03fba096 rcuscale: Move rcu_scale_writer() schedule_timeout_uninterruptible() to _idle() 
[ Upstream commit e60c122a16 ]

The rcuscale.holdoff module parameter can be used to delay the start
of rcu_scale_writer() kthread.  However, the hung-task timeout will
trigger when the timeout specified by rcuscale.holdoff is greater than
hung_task_timeout_secs:

runqemu kvm nographic slirp qemuparams="-smp 4 -m 2048M"
bootparams="rcuscale.shutdown=0 rcuscale.holdoff=300"

[  247.071753] INFO: task rcu_scale_write:59 blocked for more than 122 seconds.
[  247.072529]       Not tainted 6.4.0-rc1-00134-gb9ed6de8d4ff #7
[  247.073400] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  247.074331] task:rcu_scale_write state:D stack:30144 pid:59    ppid:2      flags:0x00004000
[  247.075346] Call Trace:
[  247.075660]  <TASK>
[  247.075965]  __schedule+0x635/0x1280
[  247.076448]  ? __pfx___schedule+0x10/0x10
[  247.076967]  ? schedule_timeout+0x2dc/0x4d0
[  247.077471]  ? __pfx_lock_release+0x10/0x10
[  247.078018]  ? enqueue_timer+0xe2/0x220
[  247.078522]  schedule+0x84/0x120
[  247.078957]  schedule_timeout+0x2e1/0x4d0
[  247.079447]  ? __pfx_schedule_timeout+0x10/0x10
[  247.080032]  ? __pfx_rcu_scale_writer+0x10/0x10
[  247.080591]  ? __pfx_process_timeout+0x10/0x10
[  247.081163]  ? __pfx_sched_set_fifo_low+0x10/0x10
[  247.081760]  ? __pfx_rcu_scale_writer+0x10/0x10
[  247.082287]  rcu_scale_writer+0x6b1/0x7f0
[  247.082773]  ? mark_held_locks+0x29/0xa0
[  247.083252]  ? __pfx_rcu_scale_writer+0x10/0x10
[  247.083865]  ? __pfx_rcu_scale_writer+0x10/0x10
[  247.084412]  kthread+0x179/0x1c0
[  247.084759]  ? __pfx_kthread+0x10/0x10
[  247.085098]  ret_from_fork+0x2c/0x50
[  247.085433]  </TASK>

This commit therefore replaces schedule_timeout_uninterruptible() with
schedule_timeout_idle().

Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-23 11:09:55 +02:00
..
Kconfig rcu: Make TASKS_RUDE_RCU select IRQ_WORK 2022-06-09 10:22:32 +02:00
Kconfig.debug rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs 2021-05-10 16:22:54 -07:00
Makefile rcuperf: Change rcuperf to rcuscale 2020-08-24 18:39:24 -07:00
rcu_segcblist.c rcu/nocb: Remove stale comment above rcu_segcblist_offload() 2021-03-15 13:54:54 -07:00
rcu_segcblist.h rcu: Mark writes to the rcu_segcblist structure's ->flags field 2022-04-08 14:23:55 +02:00
rcu.h Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
rcuscale.c rcuscale: Move rcu_scale_writer() schedule_timeout_uninterruptible() to _idle() 2023-09-23 11:09:55 +02:00
rcutorture.c rcutorture: Fix ksoftirqd boosting timing and iteration 2022-08-17 14:23:23 +02:00
refscale.c refscale: Fix uninitalized use of wait_queue_head_t 2023-09-19 12:22:31 +02:00
srcutiny.c srcutiny: Mark read-side data races 2021-08-06 13:41:48 -07:00
srcutree.c Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
sync.c rcu: Fix various typos in comments 2021-05-12 12:11:05 -07:00
tasks.h rcu-tasks: Add trc_inspect_reader() checks for exiting critical section 2023-09-02 09:17:08 +02:00
tiny.c srcu: Initialize SRCU after timers 2021-05-10 16:03:35 -07:00
tree_exp.h rcu: Prevent expedited GP from enabling tick on offline CPU 2023-09-02 09:17:07 +02:00
tree_nocb.h rcu/nocb: Start moving nocb code to its own plugin file 2021-07-20 13:41:51 -07:00
tree_plugin.h rcu: Avoid triggering strict-GP irq-work when RCU is idle 2022-10-26 12:35:29 +02:00
tree_stall.h rcu: Use per_cpu_ptr to get the pointer of per_cpu variable 2021-08-06 13:41:49 -07:00
tree.c rcu/kvfree: Avoid freeing new kfree_rcu() memory after old grace period 2023-06-21 15:59:18 +02:00
tree.h Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
update.c Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00