From: Xiao Guangrong xiaoguangr...@linux.vnet.ibm.com
Add 'perf kvm stat' support to analyze kvm vmexit/mmio/ioport smartly
Usage:
- kvm stat
run a command and gather performance counter statistics, it is the alias of
perf stat
- trace kvm events:
perf kvm stat record, or, if other tracepoints are interesting as well, we
can append the events like this:
perf kvm stat record -e timer:* -a
If many guests are running, we can track the specified guest by using -p or
--pid, -a is used to track events generated by all guests.
- show the result:
perf kvm stat report
The output example is following:
# pgrep qemu
13005
13059
total 2 guests are running on the host
Then, track the guest whose pid is 13059:
# ./perf kvm stat record -p 13059
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.253 MB perf.data.guest (~11065 samples) ]
See the vmexit events:
# ./perf kvm stat report --event=vmexit
Analyze events for all VCPUs:
VM-EXITSamples Samples% Time% Avg time
APIC_ACCESS46070.55% 0.01% 22.44us ( +- 1.75% )
HLT 9314.26%99.98% 832077.26us ( +- 10.42% )
EXTERNAL_INTERRUPT 64 9.82% 0.00% 35.35us ( +- 14.21% )
PENDING_INTERRUPT 24 3.68% 0.00% 9.29us ( +- 31.39% )
CR_ACCESS 7 1.07% 0.00% 8.12us ( +- 5.76% )
IO_INSTRUCTION 3 0.46% 0.00% 18.00us ( +- 11.79% )
EXCEPTION_NMI 1 0.15% 0.00% 5.83us ( +- -nan% )
Total Samples:652, Total events handled time:77396109.80us.
See the mmio events:
# ./perf kvm stat report --event=mmio
Analyze events for all VCPUs:
MMIO AccessSamples Samples% Time% Avg time
0xfee00380:W38784.31%79.28% 8.29us ( +- 3.32% )
0xfee00300:W 24 5.23% 9.96% 16.79us ( +- 1.97% )
0xfee00300:R 24 5.23% 7.83% 13.20us ( +- 3.00% )
0xfee00310:W 24 5.23% 2.93% 4.94us ( +- 3.84% )
Total Samples:459, Total events handled time:4044.59us.
See the ioport event:
# ./perf kvm stat report --event=ioport
Analyze events for all VCPUs:
IO Port AccessSamples Samples% Time% Avg time
0xc050:POUT 3 100.00% 100.00% 13.75us ( +- 10.83% )
Total Samples:3, Total events handled time:41.26us.
And, --vcpu is used to track the specified vcpu and --key is used to sort the
result:
# ./perf kvm stat report --event=vmexit --vcpu=0 --key=time
Analyze events for VCPU 0:
VM-EXITSamples Samples% Time% Avg time
HLT 2713.85%99.97% 405790.24us ( +- 12.70% )
EXTERNAL_INTERRUPT 13 6.67% 0.00% 27.94us ( +- 22.26% )
APIC_ACCESS14674.87% 0.03% 21.69us ( +- 2.91% )
IO_INSTRUCTION 2 1.03% 0.00% 17.77us ( +- 20.56% )
CR_ACCESS 2 1.03% 0.00% 8.55us ( +- 6.47% )
PENDING_INTERRUPT 5 2.56% 0.00% 6.27us ( +- 3.94% )
Total Samples:195, Total events handled time:10959950.90us.
[ Dong Hao haod...@linux.vnet.ibm.com
Runzhen Wang runz...@linux.vnet.ibm.com:
- rebase it on current acme's tree
- fix the compiling-error on i386
]
Signed-off-by: Xiao Guangrong xiaoguangr...@linux.vnet.ibm.com
Signed-off-by: Dong Hao haod...@linux.vnet.ibm.com
Signed-off-by: Runzhen Wang runz...@linux.vnet.ibm.com
---
tools/perf/Documentation/perf-kvm.txt | 30 ++-
tools/perf/MANIFEST |3 +
tools/perf/builtin-kvm.c | 840 -
tools/perf/util/header.c | 59 +++-
tools/perf/util/header.h |1 +
tools/perf/util/thread.h |2 +
6 files changed, 929 insertions(+), 6 deletions(-)
diff --git a/tools/perf/Documentation/perf-kvm.txt
b/tools/perf/Documentation/perf-kvm.txt
index dd84cb2..326f2cb 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -12,7 +12,7 @@ SYNOPSIS
[--guestkallsyms=path --guestmodules=path | --guestvmlinux=path]]
{top|record|report|diff|buildid-list}
'perf kvm' [--host] [--guest] [--guestkallsyms=path --guestmodules=path
- | --guestvmlinux=path] {top|record|report|diff|buildid-list}
+ | --guestvmlinux=path] {top|record|report|diff|buildid-list|stat}
DESCRIPTION
---
@@ -38,6 +38,18 @@ There are a couple of variants of perf kvm:
so that other tools can be used to fetch packages with matching symbol tables
for use by perf report.
+ 'perf kvm stat command' to run a command and gather performance counter
+ statistics.
+ Especially, perf 'kvm stat record/report' generates a statistical analysis
+ of KVM events. Currently, vmexit, mmio and
