[vdr] [PATCH] UnbufferedFile improvements v7

[Klaus Schmidinger]

Artur Skawina wrote:
> this time with a new approach to read caching. Should make watching and 
> editing recordings on a non-idle (and/or slow) machine more comfortable.
> 
> The difference to previous versions (and stock fadvise-enabled vdr) is 
> that previously, read data was almost immediately forgotten after it was 
> used; now a certain amount of recently accessed data (at most ~16M) is 
> kept around. This means that short seeks (jumps) when replaying do not 
> cause disk accesses. Things like switching play mode, FF, setting and 
> moving editing marks shouldn't usually block waiting for disk IO. The 
> changes are most noticeable when eg. several recordings are happening in 
> the background.
> 
> I did very little testing, treat this as beta quality at best. Seems to 
> work ok, but i won't probably have time to test it further for a few 
> days; maybe somebody wants to play w/ this, or even better take a look 
> at the Read() path...

Attached is the patch as I would add it for the next version.

Please take a look at the lines marked CLARIFY and let me know
if you have any comment on these.

Klaus
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