Messages in this thread | | | Date | Fri, 21 Nov 2014 15:38:41 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v2 7/7] mm/page_owner: correct owner information for early allocated pages |
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On Fri, 21 Nov 2014 17:14:06 +0900 Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
> 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 fix 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.
We really should have a Documentation/vm/page_owner.txt which explains all this stuff, provides examples, etc.
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