linux-kernel - Re: [PATCH 0/2][GIT PULL] tracing/filters: adjustements for strings

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Date:	Sun, 03 May 2009 23:47:22 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>
Subject: Re: [PATCH 0/2][GIT PULL] tracing/filters: adjustements for strings

Hi,

On Sun, 2009-05-03 at 03:50 +0200, Frederic Weisbecker wrote:
> Hi,
> 
> The following patchset includes two little peas of features
> for tracing filters, making them able to filter every kind of strings.
> 
> Now I can do this:
> 
> cd /debug/tracing
> echo > trace
> echo stacktrace > trace_options
> 
> cd events/lockdep
> echo 'name == "&REISERFS_SB(s)->lock" && wait_usec > 0' > lock_acquired/filter
> 
> echo 1 > lock_acquired/enable
> sleep 1
> echo 0 > lock_acquired/enable
> 
> cat trace
> 
>  # tracer: nop
>  #
>  #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
>  #              | |       |          |         |
>            <...>-6464  [000]   327.448232: lock_acquired: &REISERFS_SB(s)->lock (25058.984 us)
>            <...>-6464  [000]   327.448233: 
>  <= reiserfs_get_block
>  <= __block_prepare_write
>  <= block_write_begin
>  <= reiserfs_write_begin
>  <= generic_file_buffered_write
>  <= __generic_file_aio_write_nolock
>  <= generic_file_aio_write
>            <...>-6470  [000]   327.448422: lock_acquired: &REISERFS_SB(s)->lock (25112.702 us)
>            <...>-6470  [000]   327.448425: 
>  <= reiserfs_update_sd_size
>  <= reiserfs_write_end
>  <= generic_file_buffered_write
>  <= __generic_file_aio_write_nolock
>  <= generic_file_aio_write
>  <= do_sync_write
>  <= reiserfs_file_write
> 
> 
> Tom, your filter framework is awesome and very useful!
> Thanks :-)

Thanks!  And thanks for adding these new useful features, too - the
patches look good to me...

Acked-by: Tom Zanussi <tzanussi@...il.com>

Tom

> 
> Frederic.
> ---
> 
> The following changes since commit a0e39ed378fb6ba916522764cd508fa7d42ad495:
>   Heiko Carstens (1):
>         tracing: fix build failure on s390
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git tracing/filters
> 
> Frederic Weisbecker (2):
>       tracing/filters: support for filters of dynamic sized arrays
>       tracing/filters: support for operator reserved characters in strings
> 
>  kernel/trace/trace_events_filter.c |   54 ++++++++++++++++++++++++++++++++++--
>  1 files changed, 51 insertions(+), 3 deletions(-)

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