linux-kernel - [PATCH tracing 0/3] tracing: support

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Message-Id: <1682414197-13173-1-git-send-email-alan.maguire@oracle.com>
Date:   Tue, 25 Apr 2023 10:16:34 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     rostedt@...dmis.org, mhiramat@...nel.org
Cc:     corbet@....net, shuah@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH tracing 0/3] tracing: support > 8 byte filter predicates

For cases like IPv6 addresses, having a means to supply tracing
predicates for fields with more than 8 bytes would be convenient.
This series provides a simple way to support this by allowing
simple ==, != memory comparison with the predicate supplied when
the size of the field exceeds 8 bytes.  For example, to trace
::1, the predicate

	"dst == 0x00000000000000000000000000000001"

..could be used.

Patch 1 provides the support for > 8 byte fields via a memcmp()-style
predicate.  Patch 2 adds tests for filter predicates, and patch 3
documents the fact that for > 8 bytes. only == and != are supported.

Changes since RFC [1]:

- originally a fix was intermixed with the new functionality as
  patch 1 in series [1]; the fix landed separately
- small tweaks to how filter predicates are defined via fn_num as
  opposed to via fn directly

[1] https://lore.kernel.org/lkml/1659910883-18223-1-git-send-email-alan.maguire@oracle.com/

Alan Maguire (3):
  tracing: support > 8 byte array filter predicates
  selftests/ftrace: add test coverage for filter predicates
  tracing: document > 8 byte numeric filtering support

 Documentation/trace/events.rst                |  9 +++
 kernel/trace/trace_events_filter.c            | 55 +++++++++++++++-
 .../selftests/ftrace/test.d/event/filter.tc   | 62 +++++++++++++++++++
 3 files changed, 125 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/ftrace/test.d/event/filter.tc

-- 
2.31.1