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    perf/core: Change log level for duration warning to KERN_INFO · 0d87d7ec
    David Ahern 提交于
    When the perf interrupt handler exceeds a threshold warning messages
    are displayed on console:
    
      [12739.31793] perf interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
      [71340.165065] perf interrupt took too long (5005 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
    
    Many customers and users are confused by the message wondering if
    something is wrong or they need to take action to fix a problem.
    Since a user can not do anything to fix the issue, the message is really
    more informational than a warning. Adjust the log level accordingly.
    Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/1470084569-438-1-git-send-email-dsa@cumulusnetworks.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
    0d87d7ec
core.c 246.6 KB