On Wed, Sep 14, 2022 at 3:35 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > On Wed, Sep 14, 2022 at 11:37:00AM +0800, zhaoyang.huang wrote: > > From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx> > > > > The page with special page type will be deemed as bad page wrongly since > > type share the same address with mapcount. > > That's not wrongly. You didn't clear the bit. I told you you would > need to do that in the first version of the patch you sent. Yes, I have cleared the PG_trackleak since v2 as you suggested. However, IMHO, the page which has page type should be skipped for mapcount check. The present problem is there is no invoking of free_pages_prepare within the chain of drain_pages_zone->free_pcppages_bulk, special pages with page->type(PG_guard and PG_trackleak etc) will be leaked as bulkfree_pcp_prepare will deem it as bad by checking the mapcount.
