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authorChristophe Leroy <christophe.leroy@c-s.fr>2018-01-12 13:45:23 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-16 23:47:12 +1100
commitcd99ddbea250ee79027df6c469f51ad9e5452738 (patch)
treebdf7792780f06be984ec2cc200eb725dd10b7a4a /arch/powerpc/platforms
parentbb9b5a8332533ac7935ca6edfc7ebf15a5366f11 (diff)
powerpc/8xx: Only perform perf counting when perf is in use.
In TLB miss handlers, updating the perf counter is only useful when performing a perf analysis. As it has a noticeable overhead, let's only do it when needed. In order to do so, the exit of the miss handlers will be patched when starting/stopping 'perf': the first register restore instruction of each exit point will be replaced by a jump to the counting code. Once this is done, CONFIG_PPC_8xx_PERF_EVENT becomes useless as this feature doesn't add any overhead. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/Kconfig.cputype7
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index c838581f81f1..a429d859f15d 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -167,13 +167,6 @@ config PPC_FPU
bool
default y if PPC64
-config PPC_8xx_PERF_EVENT
- bool "PPC 8xx perf events"
- depends on PPC_8xx && PERF_EVENTS
- help
- This is Performance Events support for PPC 8xx. The 8xx doesn't
- have a PMU but some events are emulated using 8xx features.
-
config FSL_EMB_PERFMON
bool "Freescale Embedded Perfmon"
depends on E500 || PPC_83xx