From 75da6e38041efca51934a46a4d481eaac57d4b1e Mon Sep 17 00:00:00 2001 From: Miroslav Rezanina 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 Rebase notes (weekly-180727): - 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 (cherry picked from commit bfc1d7f3628f2ffbabbae71d57a506cea6663ddf) Signed-off-by: Danilo C. L. de Paula --- .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 05f62eab3c..41a77a90af 100644 --- a/Makefile +++ b/Makefile @@ -832,6 +832,10 @@ endif $(INSTALL_DATA) $(SRC_PATH)/pc-bios/keymaps/$$x "$(DESTDIR)$(qemu_datadir)/keymaps"; \ done $(INSTALL_DATA) $(BUILD_DIR)/trace-events-all "$(DESTDIR)$(qemu_datadir)/trace-events-all" + $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/script.d" + $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/script.d/qemu_kvm.stp "$(DESTDIR)$(qemu_datadir)/systemtap/script.d/" + $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d" + $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/conf.d/qemu_kvm.conf "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d/" for d in $(TARGET_DIRS); do \ $(MAKE) $(SUBDIR_MAKEFLAGS) TARGET_DIR=$$d/ -C $$d $@ || exit 1 ; \ done diff --git a/README.systemtap b/README.systemtap new file mode 100644 index 0000000000..ad913fc990 --- /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 0000000000..372d8160a4 --- /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 0000000000..c04abf9449 --- /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 {} -- 2.20.1