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From 47c61bc22285224ee24a7cbfa822c481f1155a81 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 7 Oct 2014 14:07:00 +0200
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Subject: [PATCH 42/43] trace: add systemtap-initscript README file to RPM
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Message-id: <1412690820-31016-12-git-send-email-stefanha@redhat.com>
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Patchwork-id: 61616
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O-Subject: [RHEL7.1 qemu-kvm PATCH 11/11] trace: add systemtap-initscript README file to RPM
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Bugzilla: 1088112
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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The downstream systemtap-initscript integration is undocumented. Fix
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that with a brief guide containing usage instructions.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit d73b49dbbce7535531da5aa1dc640208f18979d2)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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redhat/qemu-kvm.spec.template
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This patch is forward-ported from RHEL 6 qemu-kvm. RHEL 7's
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qemu-kvm.spec.template is significantly different from RHEL 6 so
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adjustments are necessary to include README.systemtap in the RPM.
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---
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README.systemtap | 43 +++++++++++++++++++++++++++++++++++++++++++
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redhat/qemu-kvm.spec.template | 3 ++-
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2 files changed, 45 insertions(+), 1 deletion(-)
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create mode 100644 README.systemtap
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diff --git a/README.systemtap b/README.systemtap
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new file mode 100644
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index 0000000..ad913fc
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--- /dev/null
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+++ b/README.systemtap
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@@ -0,0 +1,43 @@
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+QEMU tracing using systemtap-initscript
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+---------------------------------------
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+
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+You can capture QEMU trace data all the time using systemtap-initscript. This
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+uses SystemTap's flight recorder mode to trace all running guests to a
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+fixed-size buffer on the host. Old trace entries are overwritten by new
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+entries when the buffer size wraps.
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+
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+1. Install the systemtap-initscript package:
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+ # yum install systemtap-initscript
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+
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+2. Install the systemtap scripts and the conf file:
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+ # cp /usr/share/qemu-kvm/systemtap/script.d/qemu_kvm.stp /etc/systemtap/script.d/
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+ # cp /usr/share/qemu-kvm/systemtap/conf.d/qemu_kvm.conf /etc/systemtap/conf.d/
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+
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+The set of trace events to enable is given in qemu_kvm.stp. This SystemTap
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+script can be customized to add or remove trace events provided in
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+/usr/share/systemtap/tapset/qemu-kvm-simpletrace.stp.
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+
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+SystemTap customizations can be made to qemu_kvm.conf to control the flight
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+recorder buffer size and whether to store traces in memory only or disk too.
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+See stap(1) for option documentation.
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+
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+3. Start the systemtap service.
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+ # service systemtap start qemu_kvm
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+
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+4. Make the service start at boot time.
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+ # chkconfig systemtap on
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+
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+5. Confirm that the service works.
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+ # service systemtap status qemu_kvm
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+ qemu_kvm is running...
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+
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+When you want to inspect the trace buffer, perform the following steps:
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+
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+1. Dump the trace buffer.
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+ # staprun -A qemu_kvm >/tmp/trace.log
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+
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+2. Start the systemtap service because the preceding step stops the service.
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+ # service systemtap start qemu_kvm
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+
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+3. Translate the trace record to readable format.
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+ # /usr/share/qemu-kvm/simpletrace.py --no-header /usr/share/qemu-kvm/trace-events /tmp/trace.log
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--
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1.8.3.1
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