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    SubjectRe: [PATCH 09/15] readahead: add tracing event
    On 02/23/2010 10:10 PM, Wu Fengguang wrote:
    > Example output:
    >
    > # echo 1> /debug/tracing/events/readahead/enable
    > # cp test-file /dev/null
    > # cat /debug/tracing/trace # trimmed output
    > readahead-initial(dev=0:15, ino=100177, req=0+2, ra=0+4-2, async=0) = 4
    > readahead-subsequent(dev=0:15, ino=100177, req=2+2, ra=4+8-8, async=1) = 8
    > readahead-subsequent(dev=0:15, ino=100177, req=4+2, ra=12+16-16, async=1) = 16
    > readahead-subsequent(dev=0:15, ino=100177, req=12+2, ra=28+32-32, async=1) = 32
    > readahead-subsequent(dev=0:15, ino=100177, req=28+2, ra=60+60-60, async=1) = 24
    > readahead-subsequent(dev=0:15, ino=100177, req=60+2, ra=120+60-60, async=1) = 0
    >
    > CC: Ingo Molnar<mingo@elte.hu>
    > CC: Jens Axboe<jens.axboe@oracle.com>
    > CC: Steven Rostedt<rostedt@goodmis.org>
    > CC: Peter Zijlstra<a.p.zijlstra@chello.nl>
    > Signed-off-by: Wu Fengguang<fengguang.wu@intel.com>

    Acked-by: Rik van Riel <riel@redhat.com>



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