Re: [PATCH/RFC] Simplified Readahead

[Nick Piggin]

Andrew Morton wrote:
> Steven Pratt <slpratt@xxxxxxxxxxxxxx> wrote:

> > Can you expand on the POSIX_FADV_WILLNEED.
>
>
> It's an application-specified readahead hint.  It should ideally be
> asynchronous so the application can get some I/O underway while it's
> crunching on something else.  If the queue is contested then the
> application will accidentally block when launching the readahead, which
> kinda defeats the purpose.
>
> Yes, the application will block when it does the subsequent read() anyway,
> but applications expect to block in read().  Seems saner this way.

Good point. I guess you're right.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/