On Thu, 23 Sep 1999, Matthew Dillon wrote:
>
> :> > Thoughts?
> :>
> :> man madvise?
> :>
> :
> :Yeah, but MADV_FREE doesn't really do what I need. I have no idea if the
> :system actually did free my ram or not. I want to hang on to the data, but
> :if more ram is needed, then it can be discarded, but I need to know that it
> :did, so that I can recreate it. Checking every time I blit an object to see
> :if the page is zero'ed won't work.
> :
> :Kevin
>
> madvise ... MADV_DONTNEED is what you want. The data will remain mapped
> until the system reuses it, at which point it reverts to zero-fill.
Don't you mean MADV_FREE?
-Alfred
>
> The system will reuse the data fairly quickly, even if the system is
> not all that loaded.
>
> You can lock the page back in simply by writing to something in the page.
>
> The system implements this madvise feature by marking the pages clean.
> If you happen to write to the page before the system reuses it, it of
> course gets redirtied. If you don't and the system reuses the page,
> it goes bye bye (turns into zero-fill) from the point of view of your
> process.
>
> -Matt
> Matthew Dillon
> <[EMAIL PROTECTED]>
>
>
>
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