On Fri, 28 Jan 2011, KAMEZAWA Hiroyuki wrote:

quoted

quoted

I see it as a tradeoff of when to check? add_to_page_cache or when we
are want more free memory (due to allocation). It is OK to wakeup
kswapd while allocating memory, somehow for this purpose (global page
cache), add_to_page_cache or add_to_page_cache_locked does not seem
the right place to hook into. I'd be open to comments/suggestions
though from others as well.

I don't like add hook here.
AND I don't want to run kswapd because 'kswapd' has been a sign as
there are memory shortage. (reusing code is ok.)

How about adding new daemon ? Recently, khugepaged, ksmd works for
managing memory. Adding one more daemon for special purpose is not
very bad, I think. Then, you can do
 - wake up without hook
 - throttle its work.
 - balance the whole system rather than zone.
   I think per-node balance is enough...

I think we already have enough kernel daemons floating around. They are
multiplying in an amazing way. What would be useful is to map all
the memory management background stuff into a process. May call this memd
instead? Perhaps we can fold khugepaged into kswapd as well etc.

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