Add a "Drop samples" dropdown to the stack settings toolbar

[gregtatum]

It should provide an option to toggle samples that contain.

• Native stack
• JS-only stacks
• Idle stack

Idle stacks are currently not instrumented with pseudo stacks, so we'll need to string sniff. The following function names should be filtered:

• Mac: mach_msg_trap
• Windows: NtWaitForAlertByThreadId
• Windows: NtUserMsgWaitForMultipleObjectsEx
• todo

mstange can you help me with filling these in ^

┆Issue is synchronized with this Jira Task

[fqueze]

NtWaitForAlertByThreadId and NtUserMsgWaitForMultipleObjectsEx are the 2 symbols I typically see at the bottom of idle stacks on Windows profiles.

[julienw]

On Linux' libc it is __poll. I also see things like pthread_cond_wait, I don't know if that should be included. Likely yes (especially visible in the compositor, maybe that's for threads).

[julienw]

I see __poll for workers too.

[julienw]

On Mac, I see __psynch_cvwait for the compositor.

[julienw]

On Mac, I see __psynch_cvwait for the compositor.

On Windows, this is NtUserMsgWaitForMultipleObjectsEx, so like other processes.

[mikeconley]

Note that sometimes, stacks will have a leafnode at something like NtWaitForAlertByThreadId not because they're idle, but because they're waiting synchronously for something to complete (like something to finish on a different thread). We need to make sure this information isn't accidentally lost.

[julienw]

I don't know how we can discriminate such a synchronous wait. Maybe the stack actually looks different ?