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authorMike Kravetz <kravetz@us.ibm.com>2006-09-06 16:23:12 -0700
committerPaul Mackerras <paulus@samba.org>2006-09-13 18:39:53 +1000
commit57852a853b0d6761f270be0961d5d8387e98c8bb (patch)
treef3c3ff7ec94014a9acba27761dd489fdce1c66db /arch/powerpc/Kconfig.debug
parentab06ff3af34a6288b314862abfebd86ad918c5d9 (diff)
downloadlinaro-lsk-57852a853b0d6761f270be0961d5d8387e98c8bb.tar.gz
[POWERPC] powerpc: Instrument Hypervisor Calls
Add instrumentation for hypervisor calls on pseries. Call statistics include number of calls, wall time and cpu cycles (if available) and are made available via debugfs. Instrumentation code is behind the HCALL_STATS config option and has no impact if not enabled. Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/Kconfig.debug')
-rw-r--r--arch/powerpc/Kconfig.debug14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index e29ef77d3b0..d7b2aedd89a 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -18,6 +18,20 @@ config DEBUG_STACK_USAGE
This option will slow down process creation somewhat.
+config HCALL_STATS
+ bool "Hypervisor call instrumentation"
+ depends on PPC_PSERIES && DEBUG_FS
+ help
+ Adds code to keep track of the number of hypervisor calls made and
+ the amount of time spent in hypervisor callsr. Wall time spent in
+ each call is always calculated, and if available CPU cycles spent
+ are also calculated. A directory named hcall_inst is added at the
+ root of the debugfs filesystem. Within the hcall_inst directory
+ are files that contain CPU specific call statistics.
+
+ This option will add a small amount of overhead to all hypervisor
+ calls.
+
config DEBUGGER
bool "Enable debugger hooks"
depends on DEBUG_KERNEL