On 02/22/2011 07:28 AM, Andrea Arcangeli wrote:

Hi Minchan,
That's my point, we should check if the "thrashing horribly" is really
a "recently" or if it has always happened before with 2.6.18 and previous.

I would bet that "thrashing" isn't what he meant.  He almost certainly 
meant "needless I/O" and nothing to do with swapping.  I've seen this 
similar report before.  This report is almost always gets answered with 
a "set your swappiness to an appropriate value" type answer.  Or a "your 
userspace app needs to get smarter" type answer.  I think they are 
trying to do the latter, but need some help from the kernel, and that's 
what they're trying to do here.

-- 
Jeffrey Hundstad

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