Re: [patch v2 1/4] mm, migration: add destination page freeing callback

[Mel Gorman]

On Thu, May 01, 2014 at 02:35:37PM -0700, David Rientjes wrote:
> Memory migration uses a callback defined by the caller to determine how to
> allocate destination pages.  When migration fails for a source page, however, it 
> frees the destination page back to the system.
> 
> This patch adds a memory migration callback defined by the caller to determine 
> how to free destination pages.  If a caller, such as memory compaction, builds 
> its own freelist for migration targets, this can reuse already freed memory 
> instead of scanning additional memory.
> 
> If the caller provides a function to handle freeing of destination pages, it is 
> called when page migration fails.  Otherwise, it may pass NULL and freeing back 
> to the system will be handled as usual.  This patch introduces no functional 
> change.
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>

Acked-by: Mel Gorman <mgorman@xxxxxxx>

-- 
Mel Gorman
SUSE Labs
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