linux-kernel - [PATCH v4 1/2] perf/kvm: Port perf kvm to powerpc

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Message-Id: <1432180508-5060-1-git-send-email-hemant@linux.vnet.ibm.com>
Date:	Thu, 21 May 2015 09:25:07 +0530
From:	Hemant Kumar <hemant@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	maddy@...ux.vnet.ibm.com, srikar@...ux.vnet.ibm.com,
	scottwood@...escale.com, mpe@...erman.id.au, agraf@...e.de,
	kvm-ppc@...r.kernel.org, paulus@...ba.org,
	warrier@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
	acme@...nel.org, mingo@...hat.com, peterz@...radead.org,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>
Subject: [PATCH v4 1/2] perf/kvm: Port perf kvm to powerpc

From: Srikar Dronamraju <srikar@...ux.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-EXIT    Samples  Samples%     Time%    Min Time         Max        Time         Avg time

H_DATA_STORAGE       5006    35.30%     0.13%      1.94us     49.46us     12.37us ( +-   0.52% )
HV_DECREMENTER       4457    31.43%     0.02%      0.72us     16.14us      1.91us ( +-   0.96% )
       SYSCALL       2690    18.97%     0.10%      2.84us    528.24us     18.29us ( +-   3.75% )
RETURN_TO_HOST       1789    12.61%    99.76%      1.58us 672791.91us  27470.23us ( +-   3.00% )
      EXTERNAL        240     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 <srikar@...ux.vnet.ibm.com>
Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
---
Changes :
- Moved the uapi related changes to arch/powerpc patchset.

This patch has a dependency on :
http://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg89485.html
which exports the kvm exit reasons.

 tools/perf/arch/powerpc/Makefile        |  1 +
 tools/perf/arch/powerpc/util/Build      |  1 +
 tools/perf/arch/powerpc/util/kvm-stat.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 tools/perf/arch/powerpc/util/kvm-stat.c

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 7b8b0d1..c8fe207 100644
--- a/tools/perf/arch/powerpc/util/Build
+++ b/tools/perf/arch/powerpc/util/Build
@@ -1,5 +1,6 @@
 libperf-y += header.o
 libperf-y += sym-handling.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 0000000..24e06bf
--- /dev/null
+++ b/tools/perf/arch/powerpc/util/kvm-stat.c
@@ -0,0 +1,33 @@
+#include "../../util/kvm-stat.h"
+#include <asm/kvm_perf_book3s.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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