Re: differences between MADV_FREE and MADV_DONTNEED

[Andrea Arcangeli]

On Mon, Jan 16, 2006 at 09:03:00AM -0800, Suleiman Souhlal wrote:
> Andrea Arcangeli wrote:
> 
> >We can also use it for the same purpose, we could add the pages to
> >swapcache mark them dirty and zap the ptes _after_ that.
> 
> Wouldn't that cause the pages to get swapped out immediately?

Not really, it would be a non blocking operation. But they could be
swapped out shortly later (that's the whole point of DONTNEED, right?),
once there is more memory pressure. Otherwise if they're used again, a
minor fault will happen and it will find the swapcache uptodate in ram.
-
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/