Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
Hi Scott, On 05/13/2015 08:52 AM, Scott Wood wrote: On Tue, 2015-05-12 at 21:34 +0530, Hemant Kumar wrote: Hi Scott, On 05/12/2015 03:38 AM, Scott Wood wrote: On Fri, 2015-05-08 at 06:37 +0530, Hemant Kumar wrote: diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h b/arch/powerpc/include/uapi/asm/kvm_perf.h new file mode 100644 index 000..30fa670 --- /dev/null +++ b/arch/powerpc/include/uapi/asm/kvm_perf.h @@ -0,0 +1,15 @@ +#ifndef _ASM_POWERPC_KVM_PERF_H +#define _ASM_POWERPC_KVM_PERF_H + +#include asm/trace_book3s.h +#include asm/kvm.h + +#define DECODE_STR_LEN 20 + +#define VCPU_ID vcpu_id + +#define KVM_ENTRY_TRACE kvm_hv:kvm_guest_enter +#define KVM_EXIT_TRACE kvm_hv:kvm_guest_exit +#define KVM_EXIT_REASON trap + +#endif /* _ASM_POWERPC_KVM_PERF_H */ Please make sure that anything book3s-specific is named that way. Are you suggesting to name it to something like _ASM_POWERPC_BOOK3S_PERF_H ? My concern is seeing a generically named kvm_perf.h include a file called trace_book3s.h which defines kvm_trace_symbol_hcall with presumably book3s-specific content, as well as wondering how much of the rest of the file would be applicable if booke PPC were to implement perf kvm. I don't know enough about perf kvm to answer that question, but I've seen enough cases of book3s or pseries specific code that was apparently written with the belief that no other ppc64 implementations exist, or that no other ppc implementations would want to implement a certain feature, to be suspicous. Usually such cases can be dealt with after the fact (albeit not as easily as if things were organized/namespaced properly from the beginning), but this is uapi... -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev Tried to address your comments in v4 : http://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg89490.html and http://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg89485.html -- Thanks, Hemant Kumar ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
Hi Scott, On 05/12/2015 03:38 AM, Scott Wood wrote: On Fri, 2015-05-08 at 06:37 +0530, Hemant Kumar wrote: From: Srikar Dronamraju sri...@linux.vnet.ibm.com perf kvm can be used to analyze guest exit reasons. This support already exists in x86. Hence, porting it to powerpc. - To trace KVM events : perf kvm stat record If many guests are running, we can track for a specific guest by using --pid as in : perf kvm stat record --pid pid - To see the results : perf kvm stat report The result shows the number of exits (from the guest context to host/hypervisor context) grouped by their respective exit reasons with their frequency. This patch makes use of the guest exit reasons available in trace_book3s.h. It records on two already available tracepoints : kvm_hv:kvm_guest_exit and kvm_hv:kvm_guest_enter. Note : This patch has a dependency on the patch kvm/powerpc: Export kvm exit reasons which exports the KVM exit reasons through the uapi. Here is a sample o/p: # pgrep qemu 19378 60515 2 Guests are running on the host. # perf kvm stat record -a ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 4.153 MB perf.data.guest (39624 samples) ] # perf kvm stat report -p 60515 Analyze events for pid(s) 60515, all VCPUs: VM-EXITSamples Samples% Time%Min Time Max Time Avg time H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us 12.37us ( +- 0.52% ) HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us 1.91us ( +- 0.96% ) SYSCALL 269018.97% 0.10% 2.84us528.24us 18.29us ( +- 3.75% ) RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us 27470.23us ( +- 3.00% ) EXTERNAL240 1.69% 0.00%0.69us 10.67us 1.33us ( +- 5.34% ) Total Samples:14182, Total events handled time:49264158.30us. Signed-off-by: Srikar Dronamraju sri...@linux.vnet.ibm.com Signed-off-by: Hemant Kumar hem...@linux.vnet.ibm.com --- Patch has a dependency on : https://patchwork.ozlabs.org/patch/469839/ which exports the exit reasons to perf through uapi. Changes: - Original series split into two patchsets now : perf and powerpc side changes. arch/powerpc/include/uapi/asm/kvm_perf.h | 15 +++ tools/perf/arch/powerpc/Makefile | 1 + tools/perf/arch/powerpc/util/Build | 1 + tools/perf/arch/powerpc/util/kvm-stat.c | 33 4 files changed, 50 insertions(+) create mode 100644 arch/powerpc/include/uapi/asm/kvm_perf.h create mode 100644 tools/perf/arch/powerpc/util/kvm-stat.c diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h b/arch/powerpc/include/uapi/asm/kvm_perf.h new file mode 100644 index 000..30fa670 --- /dev/null +++ b/arch/powerpc/include/uapi/asm/kvm_perf.h @@ -0,0 +1,15 @@ +#ifndef _ASM_POWERPC_KVM_PERF_H +#define _ASM_POWERPC_KVM_PERF_H + +#include asm/trace_book3s.h +#include asm/kvm.h + +#define DECODE_STR_LEN 20 + +#define VCPU_ID vcpu_id + +#define KVM_ENTRY_TRACE kvm_hv:kvm_guest_enter +#define KVM_EXIT_TRACE kvm_hv:kvm_guest_exit +#define KVM_EXIT_REASON trap + +#endif /* _ASM_POWERPC_KVM_PERF_H */ Please make sure that anything book3s-specific is named that way. Are you suggesting to name it to something like _ASM_POWERPC_BOOK3S_PERF_H ? And shouldn't this be part of the arch/powerpc-side patchset? It should. Thanks, will move this to arch/powerpc side patchset. diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile index 7fbca17..21322e0 100644 --- a/tools/perf/arch/powerpc/Makefile +++ b/tools/perf/arch/powerpc/Makefile @@ -1,3 +1,4 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif +HAVE_KVM_STAT_SUPPORT := 1 Does this stuff fail gracefully if used on a PPC target that doesn't support this? Yes, it does. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev -- Thanks, Hemant Kumar ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
On Tue, 2015-05-12 at 21:34 +0530, Hemant Kumar wrote: Hi Scott, On 05/12/2015 03:38 AM, Scott Wood wrote: On Fri, 2015-05-08 at 06:37 +0530, Hemant Kumar wrote: diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h b/arch/powerpc/include/uapi/asm/kvm_perf.h new file mode 100644 index 000..30fa670 --- /dev/null +++ b/arch/powerpc/include/uapi/asm/kvm_perf.h @@ -0,0 +1,15 @@ +#ifndef _ASM_POWERPC_KVM_PERF_H +#define _ASM_POWERPC_KVM_PERF_H + +#include asm/trace_book3s.h +#include asm/kvm.h + +#define DECODE_STR_LEN 20 + +#define VCPU_ID vcpu_id + +#define KVM_ENTRY_TRACE kvm_hv:kvm_guest_enter +#define KVM_EXIT_TRACE kvm_hv:kvm_guest_exit +#define KVM_EXIT_REASON trap + +#endif /* _ASM_POWERPC_KVM_PERF_H */ Please make sure that anything book3s-specific is named that way. Are you suggesting to name it to something like _ASM_POWERPC_BOOK3S_PERF_H ? My concern is seeing a generically named kvm_perf.h include a file called trace_book3s.h which defines kvm_trace_symbol_hcall with presumably book3s-specific content, as well as wondering how much of the rest of the file would be applicable if booke PPC were to implement perf kvm. I don't know enough about perf kvm to answer that question, but I've seen enough cases of book3s or pseries specific code that was apparently written with the belief that no other ppc64 implementations exist, or that no other ppc implementations would want to implement a certain feature, to be suspicous. Usually such cases can be dealt with after the fact (albeit not as easily as if things were organized/namespaced properly from the beginning), but this is uapi... -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
On Fri, 2015-05-08 at 06:37 +0530, Hemant Kumar wrote: From: Srikar Dronamraju sri...@linux.vnet.ibm.com perf kvm can be used to analyze guest exit reasons. This support already exists in x86. Hence, porting it to powerpc. - To trace KVM events : perf kvm stat record If many guests are running, we can track for a specific guest by using --pid as in : perf kvm stat record --pid pid - To see the results : perf kvm stat report The result shows the number of exits (from the guest context to host/hypervisor context) grouped by their respective exit reasons with their frequency. This patch makes use of the guest exit reasons available in trace_book3s.h. It records on two already available tracepoints : kvm_hv:kvm_guest_exit and kvm_hv:kvm_guest_enter. Note : This patch has a dependency on the patch kvm/powerpc: Export kvm exit reasons which exports the KVM exit reasons through the uapi. Here is a sample o/p: # pgrep qemu 19378 60515 2 Guests are running on the host. # perf kvm stat record -a ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 4.153 MB perf.data.guest (39624 samples) ] # perf kvm stat report -p 60515 Analyze events for pid(s) 60515, all VCPUs: VM-EXITSamples Samples% Time%Min Time Max Time Avg time H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us 12.37us ( +- 0.52% ) HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us 1.91us ( +- 0.96% ) SYSCALL 269018.97% 0.10% 2.84us528.24us 18.29us ( +- 3.75% ) RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us 27470.23us ( +- 3.00% ) EXTERNAL240 1.69% 0.00%0.69us 10.67us 1.33us ( +- 5.34% ) Total Samples:14182, Total events handled time:49264158.30us. Signed-off-by: Srikar Dronamraju sri...@linux.vnet.ibm.com Signed-off-by: Hemant Kumar hem...@linux.vnet.ibm.com --- Patch has a dependency on : https://patchwork.ozlabs.org/patch/469839/ which exports the exit reasons to perf through uapi. Changes: - Original series split into two patchsets now : perf and powerpc side changes. arch/powerpc/include/uapi/asm/kvm_perf.h | 15 +++ tools/perf/arch/powerpc/Makefile | 1 + tools/perf/arch/powerpc/util/Build | 1 + tools/perf/arch/powerpc/util/kvm-stat.c | 33 4 files changed, 50 insertions(+) create mode 100644 arch/powerpc/include/uapi/asm/kvm_perf.h create mode 100644 tools/perf/arch/powerpc/util/kvm-stat.c diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h b/arch/powerpc/include/uapi/asm/kvm_perf.h new file mode 100644 index 000..30fa670 --- /dev/null +++ b/arch/powerpc/include/uapi/asm/kvm_perf.h @@ -0,0 +1,15 @@ +#ifndef _ASM_POWERPC_KVM_PERF_H +#define _ASM_POWERPC_KVM_PERF_H + +#include asm/trace_book3s.h +#include asm/kvm.h + +#define DECODE_STR_LEN 20 + +#define VCPU_ID vcpu_id + +#define KVM_ENTRY_TRACE kvm_hv:kvm_guest_enter +#define KVM_EXIT_TRACE kvm_hv:kvm_guest_exit +#define KVM_EXIT_REASON trap + +#endif /* _ASM_POWERPC_KVM_PERF_H */ Please make sure that anything book3s-specific is named that way. And shouldn't this be part of the arch/powerpc-side patchset? diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile index 7fbca17..21322e0 100644 --- a/tools/perf/arch/powerpc/Makefile +++ b/tools/perf/arch/powerpc/Makefile @@ -1,3 +1,4 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif +HAVE_KVM_STAT_SUPPORT := 1 Does this stuff fail gracefully if used on a PPC target that doesn't support this? -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
On 05/08/2015 09:58 AM, Ingo Molnar wrote: * Hemant Kumar hem...@linux.vnet.ibm.com wrote: # perf kvm stat report -p 60515 Analyze events for pid(s) 60515, all VCPUs: VM-EXITSamples Samples% Time%Min Time Max Time Avg time H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us 12.37us ( +- 0.52% ) HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us 1.91us ( +- 0.96% ) SYSCALL 269018.97% 0.10% 2.84us528.24us 18.29us ( +- 3.75% ) RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us 27470.23us ( +- 3.00% ) EXTERNAL240 1.69% 0.00%0.69us 10.67us 1.33us ( +- 5.34% ) Where is the last line misaligned? Copy paste error or does perf kvm produce it in such a way? Its a copy-paste error. Thanks for pointing this out. Shall I resend the patches with the correct alignment of the o/p? Thanks, Ingo -- Thanks, Hemant Kumar ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
* Hemant Kumar hem...@linux.vnet.ibm.com wrote: On 05/08/2015 09:58 AM, Ingo Molnar wrote: * Hemant Kumar hem...@linux.vnet.ibm.com wrote: # perf kvm stat report -p 60515 Analyze events for pid(s) 60515, all VCPUs: VM-EXITSamples Samples% Time%Min Time Max Time Avg time H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us 12.37us ( +- 0.52% ) HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us 1.91us ( +- 0.96% ) SYSCALL 269018.97% 0.10% 2.84us528.24us 18.29us ( +- 3.75% ) RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us 27470.23us ( +- 3.00% ) EXTERNAL240 1.69% 0.00%0.69us 10.67us 1.33us ( +- 5.34% ) Where is the last line misaligned? Copy paste error or does perf kvm produce it in such a way? Its a copy-paste error. Thanks for pointing this out. Shall I resend the patches with the correct alignment of the o/p? I don't think that's necessary, as long as the code is fine. Thanks, Ingo ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
[PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
From: Srikar Dronamraju sri...@linux.vnet.ibm.com
perf kvm can be used to analyze guest exit reasons. This support already
exists in x86. Hence, porting it to powerpc.
- To trace KVM events :
perf kvm stat record
If many guests are running, we can track for a specific guest by using
--pid as in : perf kvm stat record --pid pid
- To see the results :
perf kvm stat report
The result shows the number of exits (from the guest context to
host/hypervisor context) grouped by their respective exit reasons with
their frequency.
This patch makes use of the guest exit reasons available in
trace_book3s.h. It records on two already available tracepoints :
kvm_hv:kvm_guest_exit and kvm_hv:kvm_guest_enter.
Note : This patch has a dependency on the patch kvm/powerpc: Export
kvm exit reasons which exports the KVM exit reasons through the uapi.
Here is a sample o/p:
# pgrep qemu
19378
60515
2 Guests are running on the host.
# perf kvm stat record -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 4.153 MB perf.data.guest (39624 samples) ]
# perf kvm stat report -p 60515
Analyze events for pid(s) 60515, all VCPUs:
VM-EXITSamples Samples% Time%Min Time Max
Time Avg time
H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us
12.37us ( +- 0.52% )
HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us
1.91us ( +- 0.96% )
SYSCALL 269018.97% 0.10% 2.84us528.24us
18.29us ( +- 3.75% )
RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us
27470.23us ( +- 3.00% )
EXTERNAL240 1.69% 0.00%0.69us 10.67us
1.33us ( +- 5.34% )
Total Samples:14182, Total events handled time:49264158.30us.
Signed-off-by: Srikar Dronamraju sri...@linux.vnet.ibm.com
Signed-off-by: Hemant Kumar hem...@linux.vnet.ibm.com
---
Patch has a dependency on : https://patchwork.ozlabs.org/patch/469839/
which exports the exit reasons to perf through uapi.
Changes:
- Original series split into two patchsets now : perf and powerpc
side changes.
arch/powerpc/include/uapi/asm/kvm_perf.h | 15 +++
tools/perf/arch/powerpc/Makefile | 1 +
tools/perf/arch/powerpc/util/Build | 1 +
tools/perf/arch/powerpc/util/kvm-stat.c | 33
4 files changed, 50 insertions(+)
create mode 100644 arch/powerpc/include/uapi/asm/kvm_perf.h
create mode 100644 tools/perf/arch/powerpc/util/kvm-stat.c
diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h
b/arch/powerpc/include/uapi/asm/kvm_perf.h
new file mode 100644
index 000..30fa670
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/kvm_perf.h
@@ -0,0 +1,15 @@
+#ifndef _ASM_POWERPC_KVM_PERF_H
+#define _ASM_POWERPC_KVM_PERF_H
+
+#include asm/trace_book3s.h
+#include asm/kvm.h
+
+#define DECODE_STR_LEN 20
+
+#define VCPU_ID vcpu_id
+
+#define KVM_ENTRY_TRACE kvm_hv:kvm_guest_enter
+#define KVM_EXIT_TRACE kvm_hv:kvm_guest_exit
+#define KVM_EXIT_REASON trap
+
+#endif /* _ASM_POWERPC_KVM_PERF_H */
diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile
index 7fbca17..21322e0 100644
--- a/tools/perf/arch/powerpc/Makefile
+++ b/tools/perf/arch/powerpc/Makefile
@@ -1,3 +1,4 @@
ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
endif
+HAVE_KVM_STAT_SUPPORT := 1
diff --git a/tools/perf/arch/powerpc/util/Build
b/tools/perf/arch/powerpc/util/Build
index 0af6e9b..dd47b5e 100644
--- a/tools/perf/arch/powerpc/util/Build
+++ b/tools/perf/arch/powerpc/util/Build
@@ -1,4 +1,5 @@
libperf-y += header.o
+libperf-y += kvm-stat.o
libperf-$(CONFIG_DWARF) += dwarf-regs.o
libperf-$(CONFIG_DWARF) += skip-callchain-idx.o
diff --git a/tools/perf/arch/powerpc/util/kvm-stat.c
b/tools/perf/arch/powerpc/util/kvm-stat.c
new file mode 100644
index 000..62cdcc1
--- /dev/null
+++ b/tools/perf/arch/powerpc/util/kvm-stat.c
@@ -0,0 +1,33 @@
+#include ../../util/kvm-stat.h
+#include asm/kvm_perf.h
+
+define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
+
+static struct kvm_events_ops exit_events = {
+ .is_begin_event = exit_event_begin,
+ .is_end_event = exit_event_end,
+ .decode_key = exit_event_decode_key,
+ .name = VM-EXIT
+};
+
+const char *const kvm_events_tp[] = {
+ kvm_hv:kvm_guest_exit,
+ kvm_hv:kvm_guest_enter,
+ NULL,
+};
+
+struct kvm_reg_events_ops kvm_reg_events_ops[] = {
+ { .name = vmexit, .ops = exit_events },
+ { NULL, NULL },
+};
+
+const char * const kvm_skip_events[] = {
+ NULL,
+};
+
+int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
+{
+ kvm-exit_reasons = hv_exit_reasons;
+ kvm-exit_reasons_isa = HV;
+ return 0;
+}
--
1.9.3
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Re: [PATCH v3 1/2] perf/kvm: Port perf kvm to powerpc
* Hemant Kumar hem...@linux.vnet.ibm.com wrote: # perf kvm stat report -p 60515 Analyze events for pid(s) 60515, all VCPUs: VM-EXITSamples Samples% Time%Min Time Max Time Avg time H_DATA_STORAGE 500635.30% 0.13% 1.94us 49.46us 12.37us ( +- 0.52% ) HV_DECREMENTER 445731.43% 0.02% 0.72us 16.14us 1.91us ( +- 0.96% ) SYSCALL 269018.97% 0.10% 2.84us528.24us 18.29us ( +- 3.75% ) RETURN_TO_HOST 178912.61%99.76% 1.58us 672791.91us 27470.23us ( +- 3.00% ) EXTERNAL240 1.69% 0.00%0.69us 10.67us 1.33us ( +- 5.34% ) Where is the last line misaligned? Copy paste error or does perf kvm produce it in such a way? Thanks, Ingo ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
