Re: Page aging broken in 2.6

[Linus Torvalds]

On Fri, 26 Dec 2003, Andrew Morton wrote:
> 
> The current behaviour seems better from a theoretical point of view. 

I disagree. It's at least not obvious.

>							 All
> we want to know is the reference pattern - whether it is one process
> referencing the page frequently or 100 processes referencing it
> infrequently shouldn't matter.

I agree that those two cases should be the same. And in fact, those two
cases _will_ be the same by my suggested change ("break out of
'page_referenced()' early")

However, you ignore the third case: a page that is frequently used by 100 
processes.

Such a page behaves differently with the 'break early' behaviour, by 
pinnong the page more tightly. 

And I think that's the right behaviour. At least that's not "obviously 
wrong".

It's not something to do in 2.6.x, but I disagree that it's clear-cut.

		Linus
-
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/