Re: [PATCH] mm: check zone->all_unreclaimable in all_unreclaimable()

[KOSAKI Motohiro]

> Hi, 
> 
> Hmmm...
> If I could observed your patch, I did support your opinion. but I didn't. so, now I'm 
> curious why we got the different conclusion. tommorow, I'll try to construct a test 
> environment to reproduce your system.

Hm, 

following two patches seems to have bad interaction. former makes
SCHED_FIFO when OOM, latter makes CPU 100% occupied busy loop if
LRU is really tight.
Of cource, I need to run more much test. I'll digg it more at this 
weekend (maybe).


commit 93b43fa55088fe977503a156d1097cc2055449a2
Author: Luis Claudio R. Goncalves <lclaudio@xxxxxxxx>
Date:   Mon Aug 9 17:19:41 2010 -0700

    oom: give the dying task a higher priority


commit 0e093d99763eb4cea09f8ca4f1d01f34e121d10b
Author: Mel Gorman <mel@xxxxxxxxx>
Date:   Tue Oct 26 14:21:45 2010 -0700

    writeback: do not sleep on the congestion queue if there are no congested BDIs or if significant conge



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