Re: msync() behaviour broken for MS_ASYNC, revert patch?

[Nick Piggin]

Andrew Morton wrote:

> 2.4:
>
> 	MS_ASYNC: dirty the pagecache pages, start I/O
> 	MS_SYNC: dirty the pagecache pages, start I/O, wait on I/O
>
> 2.6:
>
> 	MS_ASYNC: dirty the pagecache pages
> 	MS_SYNC: dirty the pagecache pages, start I/O, wait on I/O.
>
> So you're saying that doing the I/O in that 25-100msec window allowed your
> app to do more pipelining.
>
> I think for most scenarios, what we have in 2.6 is better: it gives the app
> more control over when the I/O should be started. 

How so?

--
SUSE Labs, Novell Inc.
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