linux-kernel - [PATCH v2 0/3] tracing/filters: Support specifying filter hook to a TRACE

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Date:	Fri, 07 Aug 2009 10:32:34 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Tom Zanussi <tzanussi@...il.com>
Subject: [PATCH v2 0/3] tracing/filters: Support specifying filter hook to
 a TRACE_EVENT field

v2: no big changes, but addressed Steven's comments

Currently only static strings and dynamic strings have their
own filter functions, other types of field are treated as
integers.

This patchset allows assigning a specific filter type to a
field, so a field which is defined as:

	__field_ext(const char *, str, FILTER_PTR_STR)

will be treated as a string but not a plain pointer, and then
we can set the filter like this:

	# echo 'str == foo' > filter

And it's easy to add more filter functions for different types
to turn these into valid operations:

	(dev is of type dev_t)
	# echo 'dev == 8:0' > filter

	(callsite is of type void * or unsigned long)
	# echo 'callsite == skb_free' > filter

[PATCH 1/3] tracing/filters: Add filter_type to struct ftrace_event_field
[PATCH 2/3] tracing/filters: Add __field_ext() to TRACE_EVENT
[PATCH 3/3] tracing/filters: Support filtering for char * strings
---
 include/linux/ftrace_event.h       |   12 +++++++-
 include/trace/ftrace.h             |   31 ++++++++++++++++++-----
 kernel/trace/trace.h               |    2 +
 kernel/trace/trace_events.c        |    9 ++++++-
 kernel/trace/trace_events_filter.c |   47 +++++++++++++++++++++++++----------
 kernel/trace/trace_export.c        |    8 ++++--
 6 files changed, 82 insertions(+), 27 deletions(-)



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