Extend page_owner with free_pages() tracking functionality. This adds to the
dump_page_owner() output an additional backtrace, that tells us what path has
freed the page.
Aa a trivial example, let's assume that do_some_foo() has an error - an extra
put_page() on error return path, and the function
On (07/04/16 16:29), Joonsoo Kim wrote:
[..]
> > well, yes. current hits bad_page(), page_owner helps to find out who
> > stole and spoiled it from under current.
> >
> > CPU a CPU b
> >
> > alloc_page()
> > put_page() << legitimate
>
On Mon, Jul 04, 2016 at 02:45:24PM +0900, Sergey Senozhatsky wrote:
> On (07/04/16 14:29), Joonsoo Kim wrote:
> > > > On Sun, Jul 03, 2016 at 01:16:56AM +0900, Sergey Senozhatsky wrote:
> > > > > Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner
> > > > > with
> > > > > free_pages
On (07/04/16 14:29), Joonsoo Kim wrote:
> > > On Sun, Jul 03, 2016 at 01:16:56AM +0900, Sergey Senozhatsky wrote:
> > > > Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner with
> > > > free_pages() tracking functionality. This adds to the dump_page_owner()
> > > > output an additio
On Mon, Jul 04, 2016 at 02:07:30PM +0900, Sergey Senozhatsky wrote:
> Hello,
>
> On (07/04/16 13:57), Joonsoo Kim wrote:
> > On Sun, Jul 03, 2016 at 01:16:56AM +0900, Sergey Senozhatsky wrote:
> > > Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner with
> > > free_pages() tracking
Hello,
On (07/04/16 13:57), Joonsoo Kim wrote:
> On Sun, Jul 03, 2016 at 01:16:56AM +0900, Sergey Senozhatsky wrote:
> > Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner with
> > free_pages() tracking functionality. This adds to the dump_page_owner()
> > output an additional back
On Sun, Jul 03, 2016 at 01:16:56AM +0900, Sergey Senozhatsky wrote:
> Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner with
> free_pages() tracking functionality. This adds to the dump_page_owner()
> output an additional backtrace, that tells us what path has freed the
> page.
Hm
On (07/03/16 01:16), Sergey Senozhatsky wrote:
[..]
> +#ifdef CONFIG_PAGE_OWNER_TRACK_FREE
> +void __page_owner_free_pages(struct page *page, unsigned int order)
> +{
> + int i;
> + depot_stack_handle_t handle;
> + struct page_ext *page_ext = lookup_page_ext(page);
> +
> + if (unlik
Introduce PAGE_OWNER_TRACK_FREE config option to extend page owner with
free_pages() tracking functionality. This adds to the dump_page_owner()
output an additional backtrace, that tells us what path has freed the
page.
Aa a trivial example, let's assume that do_some_foo() has an error - extra
put
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