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Commit 35a6ff54 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: x86: allow single-depth wchan output 



sched.o gets smaller and faster if we compile it with -fomit-frame-pointers,
so make this a config option. The cost is the loss of multi-depth wchan
lookups - but SysRq-T is a sufficient replacement for them anyway, so their
utility is much lower these days.

the size difference is significant:

   text    data     bss     dec     hex filename
  34005    3462      24   37491    9273 sched.o.before
  33470    3462      24   36956    905c sched.o.after

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent db36cc7d

arch/i386/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -214,6 +214,17 @@ config X86_ES7000 


endchoice



config SCHED_NO_NO_OMIT_FRAME_POINTER

	bool "Single-depth WCHAN output"

	default y

	help

	  Calculate simpler /proc/<PID>/wchan values. If this option

	  is disabled then wchan values will recurse back to the

	  caller function. This provides more accurate wchan values,

	  at the expense of slightly more scheduling overhead.



	  If in doubt, say "Y".



config PARAVIRT

	bool "Paravirtualization support (EXPERIMENTAL)"

	depends on EXPERIMENTAL