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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:07 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:07 +0200
commit35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7 (patch)
tree0bf90bfa6c9a77fefe63b7947ab673374b42f942
parentdb36cc7d6d9e538481e60fae7f56646b92557526 (diff)
downloadlinux-2.6.34-ux500-35a6ff5417bf94c9e19b6b55a9eb6eea14cc7be7.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/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index f1486f8a3e6..bf9aafad497 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