On Thu, Nov 05, 2015 at 09:15:01AM +0100, Vlastimil Babka wrote: > On 11/05/2015 09:09 AM, Joonsoo Kim wrote: > > On Wed, Nov 04, 2015 at 04:00:57PM +0100, Vlastimil Babka wrote: > >> The information in /sys/kernel/debug/page_owner includes the migratetype > >> declared during the page allocation via gfp_flags. This is also checked against > >> the pageblock's migratetype, and reported as Fallback allocation if these two > >> differ (although in fact fallback allocation is not the only reason why they > >> can differ). > >> > >> However, the migratetype actually printed is the one of the pageblock, not of > >> the page itself, so it's the same for all pages in the pageblock. This is > >> apparently a bug, noticed when working on other page_owner improvements. Fixed. > > > > We can guess page migratetype through gfp_mask output although it isn't > > easy task for now. But, there is no way to know pageblock migratetype. > > I used this to know how memory is fragmented. > > Ah, I see. How bout just we print both migratetypes then and remove the > "Fallback" part, which can be trivially deduced from them (and as I noted it's > somewhat misleading anyway)? I'm okay with your new suggestion. Thanks. -- 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>