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Shutemov" To: Vlastimil Babka Cc: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Michal Hocko , Mel Gorman , Matthew Wilcox Subject: Re: [PATCH v2 3/4] mm, page_owner: keep owner info when freeing the page Message-ID: <20190924113554.azr3w3blo4h4ask2@box> References: <20190820131828.22684-1-vbabka@suse.cz> <20190820131828.22684-4-vbabka@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190820131828.22684-4-vbabka@suse.cz> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000004, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Aug 20, 2019 at 03:18:27PM +0200, Vlastimil Babka wrote: > For debugging purposes it might be useful to keep the owner info even after > page has been freed, and include it in e.g. dump_page() when detecting a bad > page state. For that, change the PAGE_EXT_OWNER flag meaning to "page owner > info has been set at least once" and add new PAGE_EXT_OWNER_ACTIVE for tracking > whether page is supposed to be currently tracked allocated or free. Why not PAGE_EXT_OWNER_ALLOCED if it means "allocated"? Active is somewhat loaded term for a page. -- Kirill A. Shutemov