hujun260 opened a new pull request, #14578:
URL: https://github.com/apache/nuttx/pull/14578
## Summary
1 Accelerated the implementation of sched_lock, remove
enter_critical_section in sched_lock and
only enter_critical_section when task scheduling is required.
2 we add sched_lock_wo_note/sched_unlock_wo_note and it does not perform
instrumentation logic
3 We aim to replace big locks with smaller ones. So we will use
spin_lock_irqsave extensively to
replace enter_critical_section in the subsequent process. We imitate the
implementation of Linux
by adding sched_lock to spin_lock_irqsave in order to address scenarios
where sem_post occurs
within spin_lock_irqsave, which can lead to spinlock failures and
deadlocks.
The entire implementation process includes:
1 spin_lock_irqsave + sched_lock
2 spin_lock/rw/spin_trylock + sched_lock
3 enter_critical_section + sched_lock
We are currently implementing the first step.
## Impact
spinlock and sched_lock
## Testing
**Build Host:**
* OS: Ubuntu 20.04
* CPU: x86_64
* Compiler: GCC 9.4.0
Configuring NuttX and compile:
$ ./tools/configure.sh -l qemu-armv8a:nsh_smp
$ make
Running with qemu
$ qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic \
-machine virt,virtualization=on,gic-version=3 \
-net none -chardev stdio,id=con,mux=on -serial chardev:con \
-mon chardev=con,mode=readline -kernel ./nuttx
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