linux-toradex.git/kernel/trace/trace_output.h, branch v2.6.30-rc5

trace: make argument 'mem' of trace_seq_putmem() const

2009-03-31T15:45:13+00:00

Impact: fix build warning

I passed a const value to trace_seq_putmem(), and I got compile warning.

Signed-off-by: Li Zefan 
Acked-by: Jens Axboe 
Cc: Arnaldo Carvalho de Melo 
Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
Signed-off-by: Ingo Molnar

tracing: add missing 'extern' keywords to trace_output.h

2009-03-31T15:45:07+00:00

Impact: cleanup

Many declarations within trace_output.h are missing the 'extern' keyword
in an inconsistent manner. This adds 'extern' where it should be.

Signed-off-by: Eduard - Gabriel Munteanu 
Signed-off-by: Ingo Molnar

tracing: provide trace_seq_reserve()

2009-03-31T15:45:02+00:00

trace_seq_reserve() allows a caller to reserve space in a trace_seq and
write directly into it. This makes it easier to export binary data to
userspace via the tracing interface, by simply filling in a struct.

Signed-off-by: Eduard - Gabriel Munteanu 
Signed-off-by: Ingo Molnar

tracing: make print_(b)printk_msg_only global

2009-03-19T19:57:55+00:00

This patch makes print_printk_msg_only and print_bprintk_msg_only
global for other functions to use. It also renames them by adding
a "trace_" to the beginning to avoid namespace collisions.

Signed-off-by: Steven Rostedt

tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk()

2009-03-06T16:59:12+00:00

Impact: faster and lighter tracing

Now that we have trace_bprintk() which is faster and consume lesser
memory than trace_printk() and has the same purpose, we can now drop
the old implementation in favour of the binary one from trace_bprintk(),
which means we move all the implementation of trace_bprintk() to
trace_printk(), so the Api doesn't change except that we must now use
trace_seq_bprintk() to print the TRACE_PRINT entries.

Some changes result of this:

- Previously, trace_bprintk depended of a single tracer and couldn't
  work without. This tracer has been dropped and the whole implementation
  of trace_printk() (like the module formats management) is now integrated
  in the tracing core (comes with CONFIG_TRACING), though we keep the file
  trace_printk (previously trace_bprintk.c) where we can find the module
  management. Thus we don't overflow trace.c

- changes some parts to use trace_seq_bprintk() to print TRACE_PRINT entries.

- change a bit trace_printk/trace_vprintk macros to support non-builtin formats
  constants, and fix 'const' qualifiers warnings. But this is all transparent for
  developers.

- etc...

V2:

- Rebase against last changes
- Fix mispell on the changelog

V3:

- Rebase against last changes (moving trace_printk() to kernel.h)

Signed-off-by: Frederic Weisbecker 
Acked-by: Steven Rostedt 
LKML-Reference: <1236356510-8381-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar

tracing: remove extra latency_trace method from trace structure

2009-03-05T02:42:04+00:00

Impact: clean up

The trace and latency_trace function pointers are identical for
every tracer but the function tracer. The differences in the function
tracer are trivial (latency output puts paranthesis around parent).

This patch removes the latency_trace pointer and all prints will
now just use the trace output function pointer.

Signed-off-by: Steven Rostedt

trace: make the trace_event callbacks return enum print_line_t

2009-02-04T19:48:39+00:00

As they actually all return these enumerators.

Reported-by: Frederic Weisbecker 
Signed-off-by: Arnaldo Carvalho de Melo 
Acked-by: Frederic Weisbecker 
Signed-off-by: Ingo Molnar

trace: Change struct trace_event callbacks parameter list

2009-02-03T13:03:52+00:00

Impact: API change

The trace_seq and trace_entry are in trace_iterator, where there are
more fields that may be needed by tracers, so just pass the
tracer_iterator as is already the case for struct tracer->print_line.

Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Ingo Molnar

trace: better manage the context info for events

2009-02-03T13:03:52+00:00

Impact: make trace_event more convenient for tracers

All tracers (for the moment) that use the struct trace_event want to
have the context info printed before their own output: the pid/cmdline,
cpu, and timestamp.

But some other tracers that want to implement their trace_event
callbacks will not necessary need these information or they may want to
format them as they want.

This patch adds a new default-enabled trace option:
TRACE_ITER_CONTEXT_INFO When disabled through:

echo nocontext-info > /debugfs/tracing/trace_options

The pid, cpu and timestamps headers will not be printed.

IE with the sched_switch tracer with context-info (default):

     bash-2935 [001] 100.356561: 2935:120:S ==> [001]  0:140:R 
   -0    [000] 100.412804:    0:140:R   + [000] 11:115:S events/0
   -0    [000] 100.412816:    0:140:R ==> [000] 11:115:R events/0
 events/0-11   [000] 100.412829:   11:115:S ==> [000]  0:140:R 

Without context-info:

 2935:120:S ==> [001]  0:140:R 
    0:140:R   + [000] 11:115:S events/0
    0:140:R ==> [000] 11:115:R events/0
   11:115:S ==> [000]  0:140:R 

A tracer can disable it at runtime by clearing the bit
TRACE_ITER_CONTEXT_INFO in trace_flags.

The print routines were renamed to trace_print_context and
trace_print_lat_context, so that they can be used by tracers if they
want to use them for one of the trace_event callbacks.

Signed-off-by: Frederic Weisbecker 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Ingo Molnar

trace: add gcc printf check to trace_seq_printf

2009-01-16T11:17:29+00:00

Andrew Morton suggested adding a printf checker to trace_seq_printf
since there are a number of users that have improper format arguments.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar