From 35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 15 Oct 2007 17:00:07 +0200 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra Signed-off-by: Mike Galbraith Reviewed-by: Thomas Gleixner --- arch/i386/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index f1486f8a3e6d..bf9aafad4978 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//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