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    ftrace: mmiotrace update, #2 · 13829537
    Pekka Paalanen 提交于
    another weekend, another patch. This should apply on top of my previous patch
    from March 23rd.
    
    Summary of changes:
    - Print PCI device list in output header
    - work around recursive probe hits on SMP
    - refactor dis/arm_kmmio_fault_page() and add check for page levels
    - remove un/reference_kmmio(), the die notifier hook is registered
    permanently into the list
    - explicitly check for single stepping in die notifier callback
    
    I have tested this version on my UP Athlon64 desktop with Nouveau, and
    SMP Core 2 Duo laptop with the proprietary nvidia driver. Both systems
    are 64-bit. One previously unknown bug crept into daylight: the ftrace
    framework's output routines print the first entry last after buffer has
    wrapped around.
    
    The most important regressions compared to non-ftrace mmiotrace at this
    time are:
    - failure of trace_pipe file
    - illegal lines in output file
    - unaware of losing data due to buffer full
    
    Personally I'd like to see these three solved before submitting to
    mainline. Other issues may come up once we know when we lose events.
    Signed-off-by: NPekka Paalanen <pq@iki.fi>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
    13829537
mmio-mod.c 11.7 KB