On Tue, May 11, 2010 at 08:59:12AM -0500, Christoph Lameter wrote: > On Mon, 10 May 2010, Mel Gorman wrote: > > > > A simple way to disallow migration of pages is to increment the refcount > > > of a page. > > I guess it could be done by walking the page-tables in advance of the move > > and elevating the page count of any pages faulted and then finding those > > pages afterwards. The fail path would be a bit of a pain though if the page > > tables are partially moved though. It's unnecessarily complicated when the > > temporary stack can be easily avoided. > > Faulting during exec? Copying in arguments and the like > Dont we hold mmap_sem for write? A get_user_pages() > or so on the range will increment the refcount. > Or just identify the temporary stack from the migration side instead of adding to the cost of exec? -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>