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@xxxxxxx> CC: Jens Axboe<jens.axboe@xxxxxxxxxx> CC: Steven Rostedt<rostedt@xxxxxxxxxxx> CC: Peter Zijlstra<a.p.zijlstra@xxxxxxxxx> Signed-off-by: Wu Fengguang<fengguang.wu@xxxxxxxxx>
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