mirror of
https://github.com/apache/nuttx.git
synced 2026-09-28 10:03:51 +00:00
508c5889d7
reason: 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 Cpu1~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 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 Signed-off-by: hujun5 <hujun5@xiaomi.com> |
||
|---|---|---|
| .. | ||
| android | ||
| arpa | ||
| crypto | ||
| cxx | ||
| net | ||
| netinet | ||
| netpacket | ||
| nuttx | ||
| ssp | ||
| sys | ||
| .gitignore | ||
| aio.h | ||
| alloca.h | ||
| assert.h | ||
| byteswap.h | ||
| ctype.h | ||
| debug.h | ||
| dirent.h | ||
| dlfcn.h | ||
| dsp.h | ||
| dspb16.h | ||
| elf.h | ||
| elf32.h | ||
| elf64.h | ||
| endian.h | ||
| err.h | ||
| errno.h | ||
| execinfo.h | ||
| fcntl.h | ||
| fixedmath.h | ||
| fnmatch.h | ||
| ftw.h | ||
| getopt.h | ||
| glob.h | ||
| grp.h | ||
| hex2bin.h | ||
| iconv.h | ||
| ifaddrs.h | ||
| inttypes.h | ||
| iso646.h | ||
| langinfo.h | ||
| libgen.h | ||
| libintl.h | ||
| limits.h | ||
| locale.h | ||
| lzf.h | ||
| malloc.h | ||
| mqueue.h | ||
| netdb.h | ||
| nl_types.h | ||
| nxflat.h | ||
| obstack.h | ||
| poll.h | ||
| pthread.h | ||
| pty.h | ||
| pwd.h | ||
| regex.h | ||
| resolv.h | ||
| sched.h | ||
| search.h | ||
| semaphore.h | ||
| signal.h | ||
| spawn.h | ||
| stdbool.h | ||
| stddef.h | ||
| stdint.h | ||
| stdio.h | ||
| stdlib.h | ||
| stdnoreturn.h | ||
| string.h | ||
| strings.h | ||
| syscall.h | ||
| syslog.h | ||
| termios.h | ||
| threads.h | ||
| time.h | ||
| unistd.h | ||
| utime.h | ||
| uuid.h | ||
| wchar.h | ||
| wctype.h | ||