qemu-kvm/0015-Add-support-for-simpletrace.patch
Miroslav Rezanina 41331165db * Wed Aug 14 2019 Miroslav Rezanina <mrezanin@redhat.com> - 4.1.0-1.el8
- Rebase to qemu 4.1.0 rc4 [bz#1705235]
- Resolves: bz#1705235
  (Rebase qemu-kvm for RHEL-AV 8.1.0)
2019-08-15 06:45:41 +02:00

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From 1e856ec9fb79314305380aba4c89c5d8987616a9 Mon Sep 17 00:00:00 2001
From: Miroslav Rezanina <mrezanin@redhat.com>
Date: Thu, 8 Oct 2015 09:50:17 +0200
Subject: Add support for simpletrace
As simpletrace is upstream, we just need to properly handle it during rpmbuild.
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Rebase notes (3.1.0):
- Fixed python 2 to python3 switch
Rebase notes (2.9.0):
- Added group argument for tracetool.py (upstream)
Rebase notes (2.8.0):
- Changed tracetool.py parameters
Merged patches (2.3.0):
- db959d6 redhat/qemu-kvm.spec.template: Install qemu-kvm-simpletrace.stp
- 5292fc3 trace: add SystemTap init scripts for simpletrace bridge
- eda9e5e simpletrace: install simpletrace.py
- 85c4c8f trace: add systemtap-initscript README file to RPM
---
.gitignore | 2 ++
Makefile | 4 +++
README.systemtap | 43 +++++++++++++++++++++++++++++++++
redhat/qemu-kvm.spec.template | 26 +++++++++++++++++++-
scripts/systemtap/conf.d/qemu_kvm.conf | 4 +++
scripts/systemtap/script.d/qemu_kvm.stp | 1 +
6 files changed, 79 insertions(+), 1 deletion(-)
create mode 100644 README.systemtap
create mode 100644 scripts/systemtap/conf.d/qemu_kvm.conf
create mode 100644 scripts/systemtap/script.d/qemu_kvm.stp
diff --git a/Makefile b/Makefile
index 288a5ac..8caca6c 100644
--- a/Makefile
+++ b/Makefile
@@ -910,6 +910,10 @@ endif
$(INSTALL_DATA) $(SRC_PATH)/pc-bios/keymaps/$$x "$(DESTDIR)$(qemu_datadir)/keymaps"; \
done
$(INSTALL_DATA) $(BUILD_DIR)/trace-events-all "$(DESTDIR)$(qemu_datadir)/trace-events-all"
+ $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/script.d"
+ $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/script.d/qemu_kvm.stp "$(DESTDIR)$(qemu_datadir)/systemtap/script.d/"
+ $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d"
+ $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/conf.d/qemu_kvm.conf "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d/"
.PHONY: ctags
ctags:
diff --git a/README.systemtap b/README.systemtap
new file mode 100644
index 0000000..ad913fc
--- /dev/null
+++ b/README.systemtap
@@ -0,0 +1,43 @@
+QEMU tracing using systemtap-initscript
+---------------------------------------
+
+You can capture QEMU trace data all the time using systemtap-initscript. This
+uses SystemTap's flight recorder mode to trace all running guests to a
+fixed-size buffer on the host. Old trace entries are overwritten by new
+entries when the buffer size wraps.
+
+1. Install the systemtap-initscript package:
+ # yum install systemtap-initscript
+
+2. Install the systemtap scripts and the conf file:
+ # cp /usr/share/qemu-kvm/systemtap/script.d/qemu_kvm.stp /etc/systemtap/script.d/
+ # cp /usr/share/qemu-kvm/systemtap/conf.d/qemu_kvm.conf /etc/systemtap/conf.d/
+
+The set of trace events to enable is given in qemu_kvm.stp. This SystemTap
+script can be customized to add or remove trace events provided in
+/usr/share/systemtap/tapset/qemu-kvm-simpletrace.stp.
+
+SystemTap customizations can be made to qemu_kvm.conf to control the flight
+recorder buffer size and whether to store traces in memory only or disk too.
+See stap(1) for option documentation.
+
+3. Start the systemtap service.
+ # service systemtap start qemu_kvm
+
+4. Make the service start at boot time.
+ # chkconfig systemtap on
+
+5. Confirm that the service works.
+ # service systemtap status qemu_kvm
+ qemu_kvm is running...
+
+When you want to inspect the trace buffer, perform the following steps:
+
+1. Dump the trace buffer.
+ # staprun -A qemu_kvm >/tmp/trace.log
+
+2. Start the systemtap service because the preceding step stops the service.
+ # service systemtap start qemu_kvm
+
+3. Translate the trace record to readable format.
+ # /usr/share/qemu-kvm/simpletrace.py --no-header /usr/share/qemu-kvm/trace-events /tmp/trace.log
diff --git a/scripts/systemtap/conf.d/qemu_kvm.conf b/scripts/systemtap/conf.d/qemu_kvm.conf
new file mode 100644
index 0000000..372d816
--- /dev/null
+++ b/scripts/systemtap/conf.d/qemu_kvm.conf
@@ -0,0 +1,4 @@
+# Force load uprobes (see BZ#1118352)
+stap -e 'probe process("/usr/libexec/qemu-kvm").function("main") { printf("") }' -c true
+
+qemu_kvm_OPT="-s4" # per-CPU buffer size, in megabytes
diff --git a/scripts/systemtap/script.d/qemu_kvm.stp b/scripts/systemtap/script.d/qemu_kvm.stp
new file mode 100644
index 0000000..c04abf9
--- /dev/null
+++ b/scripts/systemtap/script.d/qemu_kvm.stp
@@ -0,0 +1 @@
+probe qemu.kvm.simpletrace.handle_qmp_command,qemu.kvm.simpletrace.monitor_protocol_*,qemu.kvm.simpletrace.migrate_set_state {}
--
1.8.3.1