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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 4/4] mm, page_owner, debug_pagealloc: save and dump freeing stack trace Message-ID: <20190924152436.hxyu7ip5nrynicb5@box> References: <20190820131828.22684-1-vbabka@suse.cz> <20190820131828.22684-5-vbabka@suse.cz> <20190924114242.q6rtv5h6xswxigim@box> <7098e036-c955-4ccb-6bce-fedf82ad0b1b@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7098e036-c955-4ccb-6bce-fedf82ad0b1b@suse.cz> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Sep 24, 2019 at 05:15:01PM +0200, Vlastimil Babka wrote: > On 9/24/19 1:42 PM, Kirill A. Shutemov wrote: > >> --- a/mm/page_owner.c > >> +++ b/mm/page_owner.c > >> @@ -24,6 +24,9 @@ struct page_owner { > >> short last_migrate_reason; > >> gfp_t gfp_mask; > >> depot_stack_handle_t handle; > >> +#ifdef CONFIG_DEBUG_PAGEALLOC > >> + depot_stack_handle_t free_handle; > >> +#endif > > > > I think it's possible to add space for the second stack handle at runtime: > > adjust page_owner_ops->size inside the ->need(). > > Uh that would complicate the code needlessly? The extra memory overhead > isn't that much for a scenario that's already a debugging one > (page_owner), I was more concerned about the cpu overhead, thus the > static key. Okay, fair enough. -- Kirill A. Shutemov