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| author | Heinz Graalfs <graalfs@linux.vnet.ibm.com> | 2013-06-12 13:54:56 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-06-17 17:10:23 +0200 |
| commit | b764bb1c50c279b95a486d338418f7fda74fff71 (patch) | |
| tree | 3437841e26cc513f55f6366aebf533f57bbaea6e /arch/s390/include/asm/perf_event.h | |
| parent | d0321a24bf10e2299a997c4747b924f79f70a232 (diff) | |
| download | linux-stable-b764bb1c50c279b95a486d338418f7fda74fff71.tar.gz linux-stable-b764bb1c50c279b95a486d338418f7fda74fff71.tar.bz2 linux-stable-b764bb1c50c279b95a486d338418f7fda74fff71.zip | |
KVM: s390,perf: Detect if perf samples belong to KVM host or guest
This patch is based on an original patch of David Hildenbrand.
The perf core implementation calls architecture specific code in order
to ask for specific information for a particular sample:
perf_instruction_pointer()
When perf core code asks for the instruction pointer, architecture
specific code must detect if a KVM guest was running when the sample
was taken. A sample can be associated with a KVM guest when the PSW
supervisor state bit is set and the PSW instruction pointer part
contains the address of 'sie_exit'.
A KVM guest's instruction pointer information is then retrieved via
gpsw entry pointed to by the sie control-block.
perf_misc_flags()
perf code code calls this function in order to associate the kernel
vs. user state infomation with a particular sample. Architecture
specific code must also first detectif a KVM guest was running
at the time the sample was taken.
Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/include/asm/perf_event.h')
| -rw-r--r-- | arch/s390/include/asm/perf_event.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h index 5f0173a31693..1141fb3e7b21 100644 --- a/arch/s390/include/asm/perf_event.h +++ b/arch/s390/include/asm/perf_event.h @@ -14,3 +14,13 @@ /* Per-CPU flags for PMU states */ #define PMU_F_RESERVED 0x1000 #define PMU_F_ENABLED 0x2000 + +#ifdef CONFIG_64BIT + +/* Perf callbacks */ +struct pt_regs; +extern unsigned long perf_instruction_pointer(struct pt_regs *regs); +extern unsigned long perf_misc_flags(struct pt_regs *regs); +#define perf_misc_flags(regs) perf_misc_flags(regs) + +#endif /* CONFIG_64BIT */ |