On Thu, 22 Aug 2019 16:03:44 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 20 Aug 2019 15:18:24 +0200 Vlastimil Babka <vbabka@xxxxxxx> wrote: > > > v2: also fix THP split handling (added Patch 1) per Kirill > > > > The debug_pagealloc functionality serves a similar purpose on the page > > allocator level that slub_debug does on the kmalloc level, which is to detect > > bad users. One notable feature that slub_debug has is storing stack traces of > > who last allocated and freed the object. On page level we track allocations via > > page_owner, but that info is discarded when freeing, and we don't track freeing > > at all. This series improves those aspects. With both debug_pagealloc and > > page_owner enabled, we can then get bug reports such as the example in Patch 4. > > > > SLUB debug tracking additionaly stores cpu, pid and timestamp. This could be > > added later, if deemed useful enough to justify the additional page_ext > > structure size. > > Thanks. I split [1/1] out of the series as a bugfix and turned this > into a three-patch series. > None of which anyone has yet reviewed :(
