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    perf: Add pipe-specific header read/write and event processing code · 8dc58101
    Tom Zanussi 提交于
    This patch makes several changes to allow the perf event stream
    to be sent and received over a pipe:
    
    - adds pipe-specific versions of the header read/write code
    
    - adds pipe-specific version of the event processing code
    
    - adds a range of event types to be used for header or other
      pseudo events, above the range used by the kernel
    
    - checks the return value of event handlers, which they can use
      to skip over large events during event processing rather than actually
      reading them into event objects.
    
    - unifies the multiple do_read() functions and updates its
      users.
    
    Note that none of these changes affect the existing perf data
    file format or processing - this code only comes into play if
    perf output is sent to stdout (or is read from stdin).
    Signed-off-by: NTom Zanussi <tzanussi@gmail.com>
    Acked-by: NThomas Gleixner <tglx@linutronix.de>
    Cc: fweisbec@gmail.com
    Cc: rostedt@goodmis.org
    Cc: k-keiichi@bx.jp.nec.com
    Cc: acme@ghostprotocols.net
    LKML-Reference: <1270184365-8281-2-git-send-email-tzanussi@gmail.com>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    8dc58101
session.c 14.6 KB