Re: [PATCH 09/15] readahead: add tracing event

[Rik van Riel]

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>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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