• Frederic Weisbecker's avatar
    tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk() · 769b0441
    Frederic Weisbecker authored
    
    
    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: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    LKML-Reference: <1236356510-8381-5-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    769b0441
trace_functions_graph.c 20.3 KB