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Subject[PATCH v2 0/3] tracing: Add dynamic strings for synthetic events

This is v2 of the dynamic string support for synthetic events.

v1 was missing some very important code in the in-kernel API functions
that should have reserved room for dynamic strings. This adds it
along also some additional test code in the synth_event_gen_test
module that tests the dynamic strings for those APIs.

I also added Axel's changelog text to the 'tracing: Fix
parse_synth_field() error handling' patch and used ssize_t as he also
suggested. Thanks, Axel! I also noticed that the original patch
didn't use <= as it should have, so changed that as well.

Neither my command-line tests or the synth_event_gen_test module are
showing any problems at this point for me...


Original v1 text:

This patchset adds support for dynamic strings for synthetic events,
as requested by Axel Rasmussen.

Actually, the first two patches should be applied in any case - the
first just changes the current max string length and the second fixes
a bug I found while testing.

It works fine for my simple test cases, but I still need to do a lot
more testing, especially of the in-kernel API parts, which don't
affect Axel's use case.

Anyway, Axel, please try it out and send me your Tested-by: if it
works for you, and your broken testcase(s) if it doesn't. ;-)



The following changes since commit 106c076d23cca67c959a6fd1ccadb5b3ef01ddc9:

mmap_lock: add tracepoints around lock acquisition (2020-09-23 08:48:08 -0500)

are available in the Git repository at:

git:// ftrace/synth-dynstring-v2

Tom Zanussi (3):
tracing: Change STR_VAR_MAX_LEN
tracing: Fix parse_synth_field() error handling
tracing: Add support for dynamic strings to synthetic events

Documentation/trace/events.rst | 15 +-
Documentation/trace/histogram.rst | 18 +++
kernel/trace/synth_event_gen_test.c | 18 ++-
kernel/trace/trace_events_hist.c | 9 ++
kernel/trace/trace_events_synth.c | 243 ++++++++++++++++++++++++----
kernel/trace/trace_synth.h | 6 +-
6 files changed, 269 insertions(+), 40 deletions(-)


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