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Date: Mon, 17 Sep 2012 16:31:12 +0800
From: Dong Hao <haodong@...ux.vnet.ibm.com>
To: acme@...radead.org, dsahern@...il.com, mtosatti@...hat.com,
avi@...hat.com, mingo@...nel.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Cc: xiaoguangrong@...ux.vnet.ibm.com, runzhen@...ux.vnet.ibm.com
Subject: [PATCH v8 0/3] KVM: perf: kvm events analysis tool
From: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Changelog:
the changes from Avi's comments:
- move the definition of x86 fault vector to asm/kvm.h
- drop the second patch which introduced new tracpoints
the changes from David's comments:
- use scnprintf instead of snprintf
- drop exclusive check for '-a' and '-p', after this, we should
append -a to track all guest, -p to track the specified guest
- improve the help usage
- fix a possible memory leak
- some cleanups
the changes from Andrew Jones's comments:
- move stat related code to util/stat.c
Thank you very much for your patience!
This patchset introduces a perf-based tool (perf kvm stat record/report)
which can analyze kvm events more smartly. Below is the presentation slice
on 2012 Japan LinuxCon:
http://events.linuxfoundation.org/images/stories/pdf/lcjp2012_guangrong.pdf
You can get more details from it. If any questions/comments, please feel free
to let us know.
This patchset is based on Arnaldo's git tree perf/core branch.
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-EXIT Samples Samples% Time% Avg time
APIC_ACCESS 460 70.55% 0.01% 22.44us ( +- 1.75% )
HLT 93 14.26% 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 Access Samples Samples% Time% Avg time
0xfee00380:W 387 84.31% 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 Access Samples 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-EXIT Samples Samples% Time% Avg time
HLT 27 13.85% 99.97% 405790.24us ( +- 12.70% )
EXTERNAL_INTERRUPT 13 6.67% 0.00% 27.94us ( +- 22.26% )
APIC_ACCESS 146 74.87% 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 (3):
KVM: x86: export svm/vmx exit code and vector code to userspace
perf: move stat related code to util/stat.c
KVM: perf: kvm events analysis tool
arch/x86/include/asm/kvm.h | 16 +
arch/x86/include/asm/kvm_host.h | 16 -
arch/x86/include/asm/svm.h | 205 +++++---
arch/x86/include/asm/vmx.h | 127 ++++--
arch/x86/kvm/trace.h | 89 ----
tools/perf/Documentation/perf-kvm.txt | 30 ++-
tools/perf/MANIFEST | 3 +
tools/perf/Makefile | 1 +
tools/perf/builtin-kvm.c | 840 ++++++++++++++++++++++++++++++++-
tools/perf/builtin-stat.c | 56 +---
tools/perf/util/header.c | 59 +++-
tools/perf/util/header.h | 1 +
tools/perf/util/stat.c | 57 +++
tools/perf/util/stat.h | 16 +
tools/perf/util/thread.h | 2 +
15 files changed, 1235 insertions(+), 283 deletions(-)
create mode 100644 tools/perf/util/stat.c
create mode 100644 tools/perf/util/stat.h
--
1.7.2.5
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