• Steven Rostedt's avatar
    tracing: Add percpu buffers for trace_printk() · 07d777fe
    Steven Rostedt authored
    Currently, trace_printk() uses a single buffer to write into
    to calculate the size and format needed to save the trace. To
    do this safely in an SMP environment, a spin_lock() is taken
    to only allow one writer at a time to the buffer. But this could
    also affect what is being traced, and add synchronization that
    would not be there otherwise.
    Ideally, using percpu buffers would be useful, but since trace_printk()
    is only used in development, having per cpu buffers for something
    never used is a waste of space. Thus, the use of the trace_bprintk()
    format section is changed to be used for static fmts as well as dynamic ones.
    Then at boot up, we can check if the section that holds the trace_printk
    formats is non-empty, and if it does contain something, then we
    know a trace_printk() has been added to the kernel. At this time
    the trace_printk per cpu buffers are allocated. A check is also
    done at module load time in case a module is added that contains a
    Once the buffers are allocated, they are never freed. If you use
    a trace_printk() then you should know what you are doing.
    A buffer is made for each type of context:
    The context is checked and the appropriate buffer is used.
    This allows for totally lockless usage of trace_printk(),
    and they no longer even disable interrupts.
    Requested-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
trace_printk.c 7.64 KB