Re: [PATCH 08/15] readahead: record readahead patterns

[Rik van Riel]

On 02/23/2010 10:10 PM, Wu Fengguang wrote:
> Record the readahead pattern in ra_flags. This info can be examined by
> users via the readahead tracing/stats interfaces.
>
> Currently 7 patterns are defined:
>
>        	pattern			readahead for
> -----------------------------------------------------------
> 	RA_PATTERN_INITIAL	start-of-file/oversize read
> 	RA_PATTERN_SUBSEQUENT	trivial     sequential read
> 	RA_PATTERN_CONTEXT	interleaved sequential read
> 	RA_PATTERN_THRASH	thrashed    sequential read
> 	RA_PATTERN_MMAP_AROUND	mmap fault
> 	RA_PATTERN_FADVISE	posix_fadvise()
> 	RA_PATTERN_RANDOM	random read
>
> CC: Ingo Molnar<mingo@xxxxxxx>
> CC: Jens Axboe<jens.axboe@xxxxxxxxxx>
> 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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