There was some discussion to create zero-set pages in background like this: https://lkml.org/lkml/2004/10/30/73 I'm understand that it is not good for performance. But I think it can help for a device in my platform. I'm sorry I can't tell what it is. But the device needs many zero-set pages, up to several MB, so that device driver has a loop to calls alloc_page, memset(p, 0, PAGE_SIZE) and cache flush&invalidate. And the device uses the pages and returns it to kernel. Kernel reads data in the page. In this case, memset(0) must be done. I think, if memset(0) is done at idle time, it can remove memset calling of ddk. Is there any device that needs many zero-set pages? Can backgound zero-setting page be good for the device? -- Thanks, Gioh Kim -- 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>