__cpu_online_mask的设置

最新推荐文章于 2024-08-03 12:26:23 发布

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最新推荐文章于 2024-08-03 12:26:23 发布

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文章标签： linux 运维服务器

本文链接：https://blog.youkuaiyun.com/a750197579/article/details/133882988

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本文档分析了在Linux内核源码中，test_and_set_bit函数被调用的上下文，追踪到set_cpu_online和boot_cpu_init等关键函数，揭示了CPU在线状态设置的过程。

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test_and_set_bit (addr=<optimized out>, nr=<optimized out>) at /home/chenlinfei/workspace/linux/arch/riscv/include/asm/bitops.h:73
73 return __test_and_op_bit(or, __NOP, nr, addr);
(gdb) bt
#0 test_and_set_bit (addr=<optimized out>, nr=<optimized out>) at /home/chenlinfei/workspace/linux/arch/riscv/include/asm/bitops.h:73
#1 cpumask_test_and_set_cpu (cpumask=<optimized out>, cpu=<optimized out>) at /home/chenlinfei/workspace/linux/include/linux/cpumask.h:458
#2 set_cpu_online (cpu=0, online=true) at /home/chenlinfei/workspace/linux/kernel/cpu.c:2682
#3 0xffffffff80206062 in boot_cpu_init () at /home/chenlinfei/workspace/linux/kernel/cpu.c:2698
#4 0xffffffff80200610 in start_kernel () at /home/chenlinfei/workspace/linux/init/main.c:955
#5 0xffffffff80001172 in _start_kernel () at /home/chenlinfei/workspace/linux/arch/riscv/kernel/head.S:328