tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk()
authorFrederic Weisbecker <fweisbec@gmail.com>
Fri, 6 Mar 2009 16:21:49 +0000 (17:21 +0100)
committerIngo Molnar <mingo@elte.hu>
Fri, 6 Mar 2009 16:59:12 +0000 (17:59 +0100)
commit769b0441f438c4bb4872cb8560eb6fe51bcc09ee
tree9908682dfd89e97c3097a7c3adcae35d821e1895
parent1ba28e02a18cbdbea123836f6c98efb09cbf59ec
tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk()

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 <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1236356510-8381-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
13 files changed:
include/linux/ftrace.h
include/linux/kernel.h
include/linux/module.h
kernel/trace/Kconfig
kernel/trace/Makefile
kernel/trace/trace.c
kernel/trace/trace.h
kernel/trace/trace_bprintk.c [deleted file]
kernel/trace/trace_functions_graph.c
kernel/trace/trace_mmiotrace.c
kernel/trace/trace_output.c
kernel/trace/trace_output.h
kernel/trace/trace_printk.c [new file with mode: 0644]