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

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Date:	Thu, 6 Aug 2009 10:23:53 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Li Zefan <lizf@...fujitsu.com>
cc:	Frédéric Weisbecker <f.weisbecker@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] tracing/filters: Support specifying filter hook to
 a TRACE_EVENT field


On Thu, 6 Aug 2009, Li Zefan wrote:

> 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

I like the first two patches, but would like to see a V2 with the updates 
I've mentioned. The last patch I do not fully understand its purpose.

I'll wait for V2 to pull it in.

Thanks!

-- Steve


> ---
>  include/linux/ftrace_event.h       |   12 +++++++-
>  include/trace/ftrace.h             |   28 ++++++++++++++++----
>  kernel/trace/trace.h               |    2 +
>  kernel/trace/trace_events.c        |    9 ++++++-
>  kernel/trace/trace_events_filter.c |   47 +++++++++++++++++++++++++----------
>  kernel/trace/trace_export.c        |    7 +++--
>  6 files changed, 79 insertions(+), 26 deletions(-)
> 
> 
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