> > That isnt really down to labelling pages, what you are talking qbout is what
> > you get for free when page aging works right (eg 2.0.39) but don't get in
> > 2.2 - and don't yet (although its coming) quite get right in 2.4.6pre.
>
> Correct, but all pages are not equal.
That is the whole point of page aging done right. The use of a page dictates
how it is aged before being discarded. So pages referenced once are aged
rapidly, but once they get touched a couple of times then you know they arent
streaming I/O. There are other related techniques like punishing pages that
are touched when streaming I/O is done to pages further down the same file -
FreeBSD does this one for example
> The problem with updatedb is that it pushes all applications to the swap,
> and when you get back in the morning, everything has to be paged back from
> swap just because the (stupid) OS is prepared for yet another updatedb
> run.
Updatedb is a bit odd in that it mostly sucks in metadata and the buffer to
page cache balancing is a bit suspect IMHO.
Alan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:19 EST