YuuichiNakamura commented on a change in pull request #1377:
URL: https://github.com/apache/incubator-nuttx/pull/1377#discussion_r495022623
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File path: include/nuttx/sched.h
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@@ -748,6 +748,10 @@ struct tcb_s
#if CONFIG_TASK_NAME_SIZE > 0
char name[CONFIG_TASK_NAME_SIZE + 1]; /* Task name (with NUL terminator)
*/
#endif
+
+#ifdef CONFIG_SCHED_INSTRUMENTATION_SYSCALL
+ int syscall_nest; /* Syscall nest level */
Review comment:
Unfortunately tcb->xcpt.nsyscalls is not fit for my expectation.
It can be used only in PROTECTED and KERNEL build and it counts the nesting
level of user mode -> kernel mode transition.
Because my sched_note_syscall_enter/leave implementation hooks the function
call in the kernel space directly, the required count is the nesting level of
syscall function calls and it also needs in FLAT build too.
("syscall function" means the kernel APIs listed in syscall/syscall.csv)
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