Memory Tracepoints

通过这个观察和

  1. sudo perf trace -e exceptions:page_fault_kernel
sudo perf trace -e exceptions:page_fault_kernel

 12458.417 exceptions:page_fault_kernel:address=0x7fe0c0112803s ip=strncpy_from_user error_code=0x0
 12458.543 exceptions:page_fault_kernel:address=0x7fe0c00b0490s ip=strncpy_from_user error_code=0x0
 12459.853 exceptions:page_fault_kernel:address=0x7fe0c012502fs ip=strncpy_from_user error_code=0x0
 12497.294 exceptions:page_fault_kernel:address=0x7ffca5714ec0s ip=x64_setup_rt_frame error_code=0x3

sudo bpftrace -e "tracepoint:exceptions:page_fault_kernel { @[kstack] = count(); }"

@[
    exc_page_fault+315
    exc_page_fault+315
    asm_exc_page_fault+38
    _copy_to_iter+134
    tty_read+228
    vfs_read+662
    ksys_read+111
    do_syscall_64+183
    entry_SYSCALL_64_after_hwframe+119
]: 1

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