Re: [patch] sched: fix single-depth wchan output

[Andi Kleen]

Ingo Molnar <mingo@xxxxxxx> writes:
>
> are you interested in adding /proc/<PID>/stacktrace? If yes then we 
> could remove fp generation for 64-bit right now and add your 
> stacktrace patch when you are done with it.

FWIW there used to be a patch floating around doing that a couple of
years ago and even used in some distros. But the big problem was if
someone read all of proc it took a lot of CPU time to do all the stack
tracing. This also was triggerable from non root.

So yes it's useful, but it can be costly.

-Andi

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