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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2018-01-12 15:45:23 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-16 15:47:12 +0300 |
| commit | cd99ddbea250ee79027df6c469f51ad9e5452738 (patch) | |
| tree | bdf7792780f06be984ec2cc200eb725dd10b7a4a /arch/powerpc/platforms | |
| parent | bb9b5a8332533ac7935ca6edfc7ebf15a5366f11 (diff) | |
| download | linux-cd99ddbea250ee79027df6c469f51ad9e5452738.tar.xz | |
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.cputype | 7 |
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 |