On Tue, Dec 02, 2014 at 05:27:36PM +0800, Wang, Yalin wrote: > This patch add/dec zero_page's _mapcount to make sure > the mapcount is correct for zero_page, > so that when read from /proc/kpagecount, zero_page's > mapcount is also correct, userspace process like procrank can > calculate PSS correctly. I don't have specific code path to point to, but I would expect zero page with non-zero mapcount would cause a problem with rmap. How do you test the change? -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>