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2016-02-03trace: track enabled events in a separate arrayPaolo Bonzini1-1/+1
This is more cache friendly on the fast path, where we already have the event id available. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-03-02trace: add DTrace reserved words for .d filesStefan Hajnoczi1-7/+19
DTrace on Mac OS X fails due to trace events using 'self' as an argument name: GEN trace/generated-tracers-dtrace.h dtrace: failed to compile script trace/generated-tracers-dtrace.dtrace: line 1330: syntax error, unexpected DT_KEY_SELF, expecting ) near "self" make: *** [trace/generated-tracers-dtrace.h] Error 1 Filter argument names according to the list of DTrace .d file reserved keywords. Note that DTrace on Mac and Linux still do not work after this patch. There are additional build issues remaining. Reported-by: Henk Poley <henkpoley@gmail.com> Tested-by: Henk Poley <henkpoley@gmail.com> Cc: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-26trace: [ust] Fix format string computation in tcg-enabled eventsLluís Vilanova1-1/+1
TCG-enabled events start with two format strings. Delay per-argument format computation until requested ('Event.formats'). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: teach lttng backend to use format stringsAlex Bennée1-4/+11
This makes the UST backend pay attention to the format string arguments that are defined when defining payload data. With this you can now ensure integers are reported in hex mode if you want. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: [tcg] Generate TCG tracing routinesLluís Vilanova1-0/+57
Generate header "trace/generated-tcg-tracers.h" with the necessary routines for tracing events in guest code: * trace_${event}_tcg Convenience wrapper that calls the translation-time tracer 'trace_${event}_trans', and calls 'gen_helper_trace_${event}_exec to generate the TCG code to later trace the event at execution time. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: [tcg] Define TCG tracing helper routine wrappersLluís Vilanova1-0/+70
Generates header "trace/generated-helpers-wrappers.h" with definitions for TCG helper wrappers. These wrappers ('gen_helper_trace_${event}_exec_wrapper') transform mixed native and TCG argument types to TCG types and call the actual TCG helpers ('gen_helper_trace_${event}_exec_proxy'). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: [tcg] Define TCG tracing helper routinesLluís Vilanova1-0/+50
Generates file "trace/generated-helpers.c" with TCG helper definitions to trace events in guest code at execution time. The helpers ('helper_trace_${event}_exec_proxy') cast the TCG-compatible native argument types to their original types (as defined in "trace-events") and call the tracing routine ('trace_${event}_exec'). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: [tcg] Declare TCG tracing helper routinesLluís Vilanova1-0/+50
Generates file "trace/generated-helpers.h" with TCG helper declarations to trace events in guest code at execution time ('trace_${event}_exec_proxy'). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: [tcg] Add 'tcg' event propertyLluís Vilanova1-0/+5
Transforms event: tcg name(...) "...", "..." into two internal events: tcg-trans name_trans(...) "..." tcg-exec name_exec(...) "..." Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: add tracetool simpletrace_stap formatStefan Hajnoczi1-0/+71
This new tracetool "format" generates a SystemTap .stp file that outputs simpletrace binary trace data. In contrast to simpletrace or ftrace, SystemTap does not define its own trace format. All output from SystemTap is generated by .stp files. This patch lets us generate a .stp file that outputs in the simpletrace binary format. This makes it possible to reuse simpletrace.py to analyze traces recorded using SystemTap. The simpletrace binary format is especially useful for long-running traces like flight-recorder mode where string formatting can be expensive. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-12trace: extract stap_escape() function for reuseStefan Hajnoczi1-3/+8
SystemTap reserved words sometimes conflict with QEMU variable names. We escape them to prevent conflicts. Move escaping into its own function so the next patch can reuse it. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-07trace: [tracetool] Minimize the amount of per-backend codeLluís Vilanova9-65/+152
Backends now only contain the essential backend-specific code, and most of the work is moved to frontend code. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-07trace: [tracetool] Change format docs to point to the generated fileLluís Vilanova7-11/+11
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-07trace: [tracetool] Show list of frontends and backends sorted by nameLluís Vilanova1-2/+2
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-07trace: [tracetool] Add method 'Event.api' to build event namesLluís Vilanova1-3/+3
Makes it easier to ensure proper naming across the different frontends and backends. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-02-19Modified the tracetool framework for LTTng 2.xMohamad Gebai2-0/+87
* A new format is required to generate definitions for ust tracepoints. Files ust_events_h.py and ust_events_c.py define common macros, while new function ust_events_h in events.py does the actual definition of each tracepoint. * ust.py generates the new interface for calling userspace tracepoints with LTTng 2.x, replacing trace_name(args) to tracepoint(name, args). * As explained in ust_events_c.py, -Wredundant-decls gives a warning when compiling with gcc 4.7 or older. This is specific to lttng-ust so for now use a pragma clause to avoid getting a warning. Signed-off-by: Mohamad Gebai <mohamad.gebai@polymtl.ca> Reviewed-by: Alex Bennée <alex@bennee.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-03-28trace: Provide a generic tracing event descriptorLluís Vilanova3-8/+90
Uses tracetool to generate a backend-independent tracing event description (struct TraceEvent). The values for such structure are generated with the non-public "events" backend ("events-c" frontend). The generation of the defines to check if an event is statically enabled is also moved to the "events" backend ("events-h" frontend). Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-12-23build: Use separate makefile for "trace/"Lluís Vilanova1-3/+3
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> -- Changes in v2: * Do not depend on "qemu-timer-common.o". * Use "$(obj)" in rules to refer to the build sub-directory. * Remove dependencies against "$(GENERATED_HEADERS)". Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-05-01tracetool: avoid pkgutil.iter_modules() Python 2.7 functionStefan Hajnoczi1-2/+6
The pkgutil.iter_modules() function provides a way to enumerate child modules. Unfortunately it's missing in Python <2.7 so we must implement similar behavior ourselves. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
2012-04-18tracetool: Add support for the 'dtrace' backendLluís Vilanova2-0/+40
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-04-18tracetool: Add module for the 'h' formatLluís Vilanova1-0/+45
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-04-18tracetool: Add module for the 'c' formatLluís Vilanova1-0/+20
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-04-18tracetool: Rewrite infrastructure as python modulesLluís Vilanova1-0/+99
The tracetool script is written in shell and has hit several portability problems due to shell quirks or external tools across host platforms. Additionally the amount of string processing and lack of real data structures makes it tough to implement code generator backends for tracers that are more complex. This patch replaces the shell version of tracetool with a Python version. The new tracetool design is: scripts/tracetool.py - top-level script scripts/tracetool/backend/ - tracer backends live here (simple, ust) scripts/tracetool/format/ - output formats live here (.c, .h) There is common code for trace-events definition parsing so that backends can focus on generating code rather than parsing input. Support for all existing backends (nop, stderr, simple, ust, and dtrace) is added back in follow-up patches. [Commit description written by Stefan Hajnoczi] Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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