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Zqiang 83ed0cdb6a 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 11:11:00 +02:00
arch	MIPS: Only fiddle with CHECKFLAGS if `need-compiler'	2023-09-19 12:28:10 +02:00
block	blk-throttle: consider 'carryover_ios/bytes' in throtl_trim_slice()	2023-09-19 12:28:00 +02:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	X.509: if signature is unsupported skip validation	2023-09-13 09:43:03 +02:00
Documentation	dt-bindings: clock: xlnx,versal-clk: drop select:false	2023-09-19 12:27:57 +02:00
drivers	ACPICA: Add AML_NO_OPERAND_RESOLVE flag to Timer	2023-09-23 11:11:00 +02:00
fs	locks: fix KASAN: use-after-free in trace_event_raw_event_filelock_lock	2023-09-23 11:11:00 +02:00
include	kernel/fork: beware of __put_task_struct() calling context	2023-09-23 11:11:00 +02:00
init	sched/psi: Select KERNFS as needed	2023-09-13 09:42:28 +02:00
io_uring	io_uring: Don't set affinity on a dying sqpoll thread	2023-09-19 12:27:54 +02:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	rcuscale: Move rcu_scale_writer() schedule_timeout_uninterruptible() to _idle()	2023-09-23 11:11:00 +02:00
lib	kunit: Fix wild-memory-access bug in kunit_free_suite_set()	2023-09-19 12:28:08 +02:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	Multi-gen LRU: avoid race in inc_min_seq()	2023-09-19 12:28:04 +02:00
net	kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg().	2023-09-19 12:28:10 +02:00
rust	rust: allocator: Prevent mis-aligned allocation	2023-08-11 12:08:18 +02:00
samples	samples/bpf: fix broken map lookup probe	2023-09-13 09:42:34 +02:00
scripts	kconfig: fix possible buffer overflow	2023-09-19 12:27:59 +02:00
security	smackfs: Prevent underflow in smk_set_cipso()	2023-09-13 09:42:42 +02:00
sound	ASoC: tegra: Fix SFC conversion for few rates	2023-09-19 12:27:56 +02:00
tools	selftests: Keep symlinks, when possible	2023-09-19 12:28:08 +02:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()	2023-09-13 09:42:46 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	devlink: move code to a dedicated directory	2023-08-30 16:11:00 +02:00
Makefile	Linux 6.1.54	2023-09-19 12:28:10 +02:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.