什么是__kernel_vsyscall？ [英] What is __kernel_vsyscall?

问题描述

我有一个核心看起来与我通常得到的核心不同 - 大多数线程都在__kernel_vsyscall（）：

I got a core that looks very different from the ones I usually get - most of the threads are in __kernel_vsyscall() :

  9 process 11334  0xffffe410 in __kernel_vsyscall ()
  8 process 11453  0xffffe410 in __kernel_vsyscall ()
  7 process 11454  0xffffe410 in __kernel_vsyscall ()
  6 process 11455  0xffffe410 in __kernel_vsyscall ()
  5 process 11474  0xffffe410 in __kernel_vsyscall ()
  4 process 11475  0xffffe410 in __kernel_vsyscall ()
  3 process 11476  0xffffe410 in __kernel_vsyscall ()
  2 process 11477  0xffffe410 in __kernel_vsyscall ()
  1 process 11323  0x08220782 in MyClass::myfunc ()

这是什么意思？

编辑：
特别是，我通常在pthread_cond_wait和___newselect_nocancel中看到很多线程，现在这些线程在每个线程的第二帧 - 为什么这个核心不同？

In particular, I usually see a lot of threads in "pthread_cond_wait" and "___newselect_nocancel" and now those are on the second frame in each thread - why is this core different?

推荐答案

__ kernel_vsyscal 是linux-gate.so Linux内核的一部分）使用最快的可用方法进行系统调用，优选 sysenter 指令。这件事由 Johan Petersson 正确解释。

__kernel_vsyscal is the method used by linux-gate.so (a part of the Linux kernel) to make a system call using the fastest available method, preferably the sysenter instruction. The thing is properly explained by Johan Petersson.

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