Re: mmap() better than read() fro streaming, Was: Re: Streaming disk I/O kills file buffering and ma

Benno Senoner (sbenno@gardena.net)
Wed, 25 Aug 1999 20:12:13 +0200

On Wed, 25 Aug 1999, Andrea Arcangeli wrote:
> On Wed, 25 Aug 1999, Benno Senoner wrote:
>
> >will mlock() automatically cause all pages to be read from the file ?
>
> Yes.
>
> >But since I already do an mlockall() at the beginnig, there is no need of
> >additional mlock()s
>
> Yes (if you use MCL_FUTURE).
>
> Andrea

Yes, I run with mlockall(MCL_CURRENT|MCL_FUTURE)
I can confirm this now:
I just removed my memcpy()s for testing purposes, and the app loads the
data nicely.
Pratically this means that if you enabled MCL_FUTURE,
mmap() will return only after all the mapped segment of the file resides in
memory.
Correct me please if I am wrong.

regards,
Benno.

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