Re: [PATCH 2/3] mm: Ensure that mark_page_accessed moves pages to the active list

On Wed, May 01, 2013 at 04:14:16PM +0800, Ric Mason wrote:

On 05/01/2013 04:06 PM, Mel Gorman wrote:

quoted

On Wed, May 01, 2013 at 01:41:34PM +0800, Sam Ben wrote:

quoted

Hi Mel,
On 04/30/2013 12:31 AM, Mel Gorman wrote:

quoted

If a page is on a pagevec then it is !PageLRU and mark_page_accessed()
may fail to move a page to the active list as expected. Now that the
LRU is selected at LRU drain time, mark pages PageActive if they are
on a pagevec so it gets moved to the correct list at LRU drain time.
Using a debugging patch it was found that for a simple git checkout
based workload that pages were never added to the active file list in

Could you show us the details of your workload?

The workload is git checkouts of a fixed number of commits for the

Is there script which you used?

mmtests with config-global-dhp__io-gitcheckout-randread-starvation . Parallel
randread was to see if the random file read would push the metadata blocks
out or not. I expected it would not be enough to trigger the reported
problem but it would be enough to determine if file pages were getting
added to the active lists or not.

quoted

kernel git tree. It starts with a warm-up run that is not timed and then
records the time for a number of iterations.

How to record the time for a number of iterations? Is the iteration
here means lru scan?

/usr/bin/time

-- 
Mel Gorman
SUSE Labs

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