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Message-Id: <20240830152916.10136-1-john.ogness@linutronix.de>
Date: Fri, 30 Aug 2024 17:34:59 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-fsdevel@...r.kernel.org,
Jiri Slaby <jirislaby@...nel.org>,
linux-serial@...r.kernel.org
Subject: [PATCH printk v5 00/17] add threaded printing + the rest
Hi,
This is v5 of a series to implement threaded console printing
as well as some other minor pieces (such as proc and sysfs
recognition of nbcon consoles). v4 is here [0].
For information about the motivation of the nbcon consoles,
please read the cover letter of the original v1 [1].
This series provides the remaining pieces of the printk
rework. All other components are either already mainline or are
currently in linux-next. In particular this series does:
- Implement dedicated printing threads per nbcon console.
- Implement forced threading of legacy consoles for PREEMPT_RT.
- Implement nbcon support for proc and sysfs console-related
files.
- Provide a new helper function nbcon_reacquire_nobuf() to
allow nbcon console drivers to reacquire ownership.
Note that this series does *not* provide an nbcon console
driver. That will come in a follow-up series.
Here are the changes since v4:
- For nbcon_kthread_create(), add more explanations about the
context and rules to the kerneldoc.
- In nbcon_alloc(), clear con->pbufs on failure.
- Remove legacy_kthread_wake() and add its functionality to
wake_up_klogd_work_func() since it was the only call site.
- In console_start(), allow triggering the legacy loop if it is
an nbcon. There might be a registered boot console.
- In __pr_flush(), add atomic flushing before wait loop.
- In console_try_replay_all(), add atomic flushing.
John Ogness
[0] https://lore.kernel.org/lkml/20240827044333.88596-1-john.ogness@linutronix.de
[1] https://lore.kernel.org/lkml/20230302195618.156940-1-john.ogness@linutronix.de
John Ogness (16):
printk: nbcon: Add function for printers to reacquire ownership
printk: Fail pr_flush() if before SYSTEM_SCHEDULING
printk: Flush console on unregister_console()
printk: nbcon: Add context to usable() and emit()
printk: nbcon: Init @nbcon_seq to highest possible
printk: nbcon: Relocate nbcon_atomic_emit_one()
printk: nbcon: Use thread callback if in task context for legacy
printk: nbcon: Rely on kthreads for normal operation
printk: Provide helper for message prepending
printk: nbcon: Show replay message on takeover
proc: consoles: Add notation to c_start/c_stop
proc: Add nbcon support for /proc/consoles
tty: sysfs: Add nbcon support for 'active'
printk: Implement legacy printer kthread for PREEMPT_RT
printk: nbcon: Assign nice -20 for printing threads
printk: Avoid false positive lockdep report for legacy printing
Thomas Gleixner (1):
printk: nbcon: Introduce printer kthreads
drivers/tty/tty_io.c | 2 +-
fs/proc/consoles.c | 7 +-
include/linux/console.h | 48 +++
kernel/printk/internal.h | 82 ++++-
kernel/printk/nbcon.c | 504 +++++++++++++++++++++++++-----
kernel/printk/printk.c | 465 ++++++++++++++++++++++++---
kernel/printk/printk_ringbuffer.h | 2 +
kernel/printk/printk_safe.c | 4 +-
8 files changed, 981 insertions(+), 133 deletions(-)
base-commit: 59cd94ef80094857f0d0085daa2e32badc4cddf4
--
2.39.2
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