From a8ebb2f69df031099116afebca2fb2a2cb3ec678 Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Tue, 7 Oct 2014 14:06:58 +0200
Subject: [PATCH 40/43] trace: add SystemTap init scripts for simpletrace
bridge
Message-id: <1412690820-31016-10-git-send-email-stefanha@redhat.com>
Patchwork-id: 61614
O-Subject: [RHEL7.1 qemu-kvm PATCH 09/11] trace: add SystemTap init scripts for simpletrace bridge
Bugzilla: 1088112
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Add example files for use with the systemtap-initscript package. These
example files set up the SystemTap flight recorder with our simpletrace
bridge script. In other words, they set up always-on simpletrace.
The example file enables a small subset of trace events across all
qemu-kvm processes with 4MB per CPU trace buffers. This example
configuration may be useful to customers who wish to run with always-on
tracing.
To enable it:
# yum install systemtap-initscript
# cp /usr/share/qemu-kvm/systemtap/conf.d/qemu_kvm.conf /etc/systemtap/conf.d/
# cp /usr/share/qemu-kvm/systemtap/script.d/qemu_kvm.stp /etc/systemtap/script.d/
# service systemtap start qemu_kvm
Note that due to systemtap-initscript naming restrictions the scripts
are called "qemu_kvm" instead of "qemu-kvm".
Once installed the script will be activated on boot.
Note that since gitignore(1) hides *.d we explicitly unhide
scripts/systemtap/{conf.d,script.d} in this patch.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 3a83a60ee0fd25580499695e4781fc473de147c5)
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Conflicts:
Makefile
redhat/qemu-kvm.spec.template
This downstream commit from RHEL 6.6 was forwarded-ported to RHEL 7.1
where the Makefile and qemu-kvm.spec.template are organized differently.
---
.gitignore | 2 ++
Makefile | 4 ++++
redhat/qemu-kvm.spec.template | 4 +++-
scripts/systemtap/conf.d/qemu_kvm.conf | 4 ++++
scripts/systemtap/script.d/qemu_kvm.stp | 1 +
5 files changed, 14 insertions(+), 1 deletion(-)
create mode 100644 scripts/systemtap/conf.d/qemu_kvm.conf
create mode 100644 scripts/systemtap/script.d/qemu_kvm.stp
diff --git a/.gitignore b/.gitignore
index 4f2345c..454561e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -74,6 +74,8 @@ fsdev/virtfs-proxy-helper.pod
*.vr
*.d
!scripts/qemu-guest-agent/fsfreeze-hook.d
+!scripts/systemtap/script.d
+!scripts/systemtap/conf.d
*.o
*.lo
*.la
diff --git a/Makefile b/Makefile
index 1b0b4f7..8407945 100644
--- a/Makefile
+++ b/Makefile
@@ -407,6 +407,10 @@ endif
$(INSTALL_DATA) $(SRC_PATH)/pc-bios/keymaps/$$x "$(DESTDIR)$(qemu_datadir)/keymaps"; \
done
$(INSTALL_DATA) $(SRC_PATH)/trace-events "$(DESTDIR)$(qemu_datadir)/trace-events"
+ $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/script.d"
+ $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/script.d/qemu_kvm.stp "$(DESTDIR)$(qemu_datadir)/systemtap/script.d/"
+ $(INSTALL_DIR) "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d"
+ $(INSTALL_DATA) $(SRC_PATH)/scripts/systemtap/conf.d/qemu_kvm.conf "$(DESTDIR)$(qemu_datadir)/systemtap/conf.d/"
for d in $(TARGET_DIRS); do \
$(MAKE) -C $$d $@ || exit 1 ; \
done
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