Configuration of complex ftrace histograms could be hard, using the existing ftrace interface.
The "--sql" option is implemented to simplify this task. It uses a sql-like syntax to define
the histograms and generates necessary ftrace syntetic events and triggers. Each ftrace event
represents a sql tible, while the fields of this event are rows in the table.
Few trace-cmd library APIs are introduced in this patch set, used in the
sql parser logic:
in libtracefs: tracefs_instance_file_append()
in libtraceevent: new flag to suppress parsing warnings
The patch set is based on Steven Rostedt's PoC implementation:
https://github.com/rostedt/sqlhist
[
v3 changes:
- Do not allocate tep handler in sqlparser library, pass it as input
parameter to sqlhist_parse() API. The tep handler, initialized with
all required ftarce events must, be supplied by the API caller.
- Add tep handler to common_record_context of trace-cmd record and
similar commands. Add logic to initialize and destroy it.
- Implemented new traceevent API to suppress parsing error while
reading ftrace events.
v2 changes:
- Removed patches for trace-cmd reset sub command from this patch set, as
they are not directly related to the SQL-like syntax implementation.
- Fixed the use case with more than one "--sql" argument. Added logic to
clean up the parser state before parsing a new string.
- Implemented API for freeing all resources, allocated by the parser.
- Fixed the use case with ftrace instances.
]
Tzvetomir Stoyanov (VMware) (5):
trace-cmd: Add new libtracefs API tracefs_instance_file_append()
trace-cmd: Unit test for tracefs_instance_file_append() API
trace-cmd: Add new libtraceevent flag to suppress parsing warnings
trace-cmd: Suppress parsing warnings in tracefs_local_events() API
trace-cmd: Add "--sql" option to trace-cmd start and record sub
commands
Documentation/trace-cmd-record.1.txt | 37 +
Makefile | 1 +
include/traceevent/event-parse.h | 2 +
include/tracefs/tracefs.h | 2 +
lib/traceevent/event-parse.c | 6 +-
lib/tracefs/tracefs-events.c | 2 +-
lib/tracefs/tracefs-instance.c | 53 +-
tracecmd/Makefile | 12 +-
tracecmd/include/trace-local.h | 4 +
tracecmd/sqlparser/Makefile | 52 +
tracecmd/sqlparser/sqlhist-api.h | 29 +
tracecmd/sqlparser/sqlhist-parse.c | 1526 ++++++++++++++++++++++++++
tracecmd/sqlparser/sqlhist.h | 34 +
tracecmd/sqlparser/sqlhist.l | 59 +
tracecmd/sqlparser/sqlhist.y | 175 +++
tracecmd/trace-record.c | 142 ++-
tracecmd/trace-usage.c | 2 +
utest/tracefs-utest.c | 106 +-
18 files changed, 2202 insertions(+), 42 deletions(-)
create mode 100644 tracecmd/sqlparser/Makefile
create mode 100644 tracecmd/sqlparser/sqlhist-api.h
create mode 100644 tracecmd/sqlparser/sqlhist-parse.c
create mode 100644 tracecmd/sqlparser/sqlhist.h
create mode 100644 tracecmd/sqlparser/sqlhist.l
create mode 100644 tracecmd/sqlparser/sqlhist.y
--
2.24.1
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