linux-kernel - Re: [RFCv2] ftrace, perf: Adding support to use function trace

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Date:	Mon, 19 Dec 2011 14:40:24 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	paulus@...ba.org, acme@...stprotocols.net, a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [RFCv2] ftrace, perf: Adding support to use function trace

hi,
any feedback?

thanks,
jirka

On Mon, Dec 05, 2011 at 06:22:46PM +0100, Jiri Olsa wrote:
> hi,
> here's another version of perf support for function trace
> with filter. The changeset is working and hopefully is not
> introducing more bugs.. ;) still testing though..
> 
> It's still marked RFC since I'm not sure there's better way to go
> with patches 2 and 10. Also not sure if the condition fixed by
> patch 7 was not intentional. The rest is fixed/updated version
> of the v1 changes.
> 
> attached patches:
>  01/10 ftrace: Fix possible NULL dereferencing in __ftrace_hash_rec_update
>  02/10 ftrace: Change mcount call replacement logic
>  03/10 ftrace: Add enable/disable ftrace_ops control interface
>  04/10 ftrace, perf: Add open/close tracepoint perf registration actions
>  05/10 ftrace, perf: Add add/del tracepoint perf registration actions
>  06/10 ftrace, perf: Add support to use function tracepoint in perf
>  07/10 ftrace: Change filter/notrace set functions to return exit code
>  08/10 ftrace, perf: Distinguish ftrace function event field type
>  09/10 ftrace, perf: Add filter support for function trace event
>  10/10 ftrace, graph: Add global_ops filter callback for graph tracing
> 
> v2 changes:
>  01/10 - keeping the old fix instead of adding hash_has_contents func
>          I'll send separating patchset for this
>  02/10 - using different way to avoid the issue (3/9 in v1)
>  03/10 - using the way proposed by Steven for controling ftrace_ops
>          (4/9 in v1)
>  06/10 - added check ensuring the ftrace:function event could be used by
>          root only (7/9 in v1)
>  08/10 - added more description (8/9 in v1)
>  09/10 - changed '&&' operator to '||' which seems more suitable
>          in this case (9/9 in v1)
> 
> thanks for comments,
> jirka
> ---
>  include/linux/ftrace.h             |   18 +++-
>  include/linux/ftrace_event.h       |    9 +-
>  include/linux/perf_event.h         |    3 +
>  kernel/trace/ftrace.c              |  202 +++++++++++++++++++++++++++++------
>  kernel/trace/trace.h               |   11 ++-
>  kernel/trace/trace_event_perf.c    |  212 +++++++++++++++++++++++++++++-------
>  kernel/trace/trace_events.c        |   12 ++-
>  kernel/trace/trace_events_filter.c |  116 ++++++++++++++++++-
>  kernel/trace/trace_export.c        |   53 ++++++++-
>  kernel/trace/trace_kprobe.c        |    8 +-
>  kernel/trace/trace_syscalls.c      |   18 +++-
>  11 files changed, 562 insertions(+), 100 deletions(-)
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