On 04/25/2015 01:45 PM, Mel Gorman wrote:
> If a PTE is unmapped and it's dirty then it was writable recently. Due
> to deferred TLB flushing, it's best to assume a writable TLB cache entry
> exists. With that assumption, the TLB must be flushed before any IO can
> start or the page is freed to avoid lost writes or data corruption. This
> patch defers flushing of potentially writable TLBs as long as possible.
> 
> Signed-off-by: Mel Gorman <mgor...@suse.de>

Reviewed-by: Rik van Riel <r...@redhat.com>

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