Re: [RFC PATCH 0/3] Obey mark_page_accessed hint given by filesystems

[Mel Gorman]

On Wed, May 01, 2013 at 02:28:17PM +0800, Will Huck wrote:
> Hi Mel,
> On 04/30/2013 12:31 AM, Mel Gorman wrote:
> >Andrew Perepechko reported a problem whereby pages are being prematurely
> >evicted as the mark_page_accessed() hint is ignored for pages that are
> >currently on a pagevec -- http://www.spinics.net/lists/linux-ext4/msg37340.html .
> >Alexey Lyahkov and Robin Dong have also reported problems recently that
> >could be due to hot pages reaching the end of the inactive list too quickly
> >and be reclaimed.
> 
> Both shrink_active_list and shrink_inactive_list can call
> lru_add_drain(), why the hot pages can't be mark Actived during this
> time?
> 

Because by then it's not known that the filesystem had called
mark_page_accessed() to indicate the page should be activated.

-- 
Mel Gorman
SUSE Labs
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