mm/page_owner: correct owner information for early allocated pages
Extended memory to store page owner information is initialized some time later than that page allocator starts. Until initialization, many pages can be allocated and they have no owner information. This make debugging using page owner harder, so some fixup will be helpful. This patch fixes up this situation by setting fake owner information immediately after page extension is initialized. Information doesn't tell the right owner, but, at least, it can tell whether page is allocated or not, more correctly. On my testing, this patch catches 13343 early allocated pages, although they are mostly allocated from page extension feature. Anyway, after then, there is no page left that it is allocated and has no page owner flag. Signed-off-by:Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Dave Hansen <dave@sr71.net> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Jungsoo Son <jungsoo.son@lge.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
Please register or sign in to comment