Re: [RFC] Removing page->flags

[Nick Piggin <nickpiggin@yahoo.com.au>]

Magnus Damm wrote:

> But introducing a second page->flags is out of the question, and
> breaking out flags and placing a pointer to them in the node data
> structure will introduce more cache misses. So it is probably not
> worth it.
> 

Yep. Even then, you can't simply have a single non-atomic flags word,
unless _all_ flags are protected by the same lock.

>>
>>It seems pretty unlikely that we'll get a pluggable replacement
>>policy in mainline any time soon though.
> 
> 
> So, do you think it is more likely that a ClockPro implementation will
> be accepted then? Or is Linux "doomed" to LRU forever?
> 

I think (hope) that Linux eventually (if slowly) moves toward the best
implementation available. I just don't think there will be sufficient
justification for a pluggable page reclaim infrastructure in the mainline
kernel.

Cheers,
Nick

-- 
SUSE Labs, Novell Inc.
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