jerpelea opened a new pull request, #14025:
URL: https://github.com/apache/nuttx/pull/14025
## Summary
1 To improve efficiency, we mimic Linux's behavior where preemption
disabling is
only applicable to the current CPU and does not affect other CPUs.
2 In the future, we will implement "spinlock+sched_lock", and use it
extensively.
Under such circumstances, if preemption is still globally disabled, it will
seriously impact
the scheduling efficiency.
3 We have removed g_cpu_lockset and used irqcount in order to eliminate the
dependency of
schedlock on critical sections in the future, simplify the logic, and
further enhance the
performance of sched_lock.
4 We set lockcount to 1 in order to lock scheduling on all CPUs during
startup, without
the need to provide additional functions to disable scheduling on other CPUs.
5 Cpu (1-n) must wait for cpu0 to enter the idle state before enabling
scheduling because
it prevents CPUs1~n from competing with cpu0 for the memory manager mutex,
which could
cause the cpu0 idle task to enter a wait state and trigger an assert.
size nuttx
before:
text data bss dec hex filename
265396 51057 63646 380099 5ccc3 nuttx
after:
text data bss dec hex filename
265184 51057 63642 379883 5cbeb nuttx
size -216
## Impact
RELEASE
## Testing
CI
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