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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:07 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:07 +0200 |
| commit | 35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7 (patch) | |
| tree | 0bf90bfa6c9a77fefe63b7947ab673374b42f942 | |
| parent | db36cc7d6d9e538481e60fae7f56646b92557526 (diff) | |
| download | op-kernel-dev-35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7.zip op-kernel-dev-35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7.tar.gz | |
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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/i386/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index f1486f8..bf9aafa 100644 --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig @@ -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 |
