Re: [PATCH] mm: remove zone->prev_prioriy

[Andrew Morton]

On Tue, 10 Feb 2009 19:57:01 +0900
MinChan Kim <minchan.kim@xxxxxxxxx> wrote:

> As you know, prev_priority is used as a measure of how much stress page reclaim.
> But now we doesn't need it due to split-lru's way.
> 
> I think it would be better to remain why prev_priority isn't needed any more
> and how split-lru can replace prev_priority's role in changelog.
> 
> In future, it help mm newbies understand change history, I think.

Yes, I'd be fascinated to see that explanation.

In http://groups.google.pn/group/linux.kernel/browse_thread/thread/fea9c9a0b43162a1
it was asserted that we intend to use prev_priority again in the future.

We discussed this back in November:
http://lkml.indiana.edu/hypermail/linux/kernel/0811.2/index.html#00001

And I think that I still think that the VM got worse due to its (new)
failure to track previous state.  IIRC, the response to that concern
was quite similar to handwavy waffling.

--
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/