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Shutemov" To: Alexander Duyck Cc: virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org, mst@redhat.com, catalin.marinas@arm.com, david@redhat.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, will@kernel.org, linux-arm-kernel@lists.infradead.org, osalvador@suse.de, yang.zhang.wz@gmail.com, pagupta@redhat.com, konrad.wilk@oracle.com, nitesh@redhat.com, riel@surriel.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, ying.huang@intel.com, pbonzini@redhat.com, dan.j.williams@intel.com, fengguang.wu@intel.com, alexander.h.duyck@linux.intel.com, kirill.shutemov@linux.intel.com Subject: Re: [PATCH v9 3/8] mm: Move set/get_pcppage_migratetype to mmzone.h Message-ID: <20190909095608.jwachx3womhqmjbl@box> References: <20190907172225.10910.34302.stgit@localhost.localdomain> <20190907172528.10910.37051.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190907172528.10910.37051.stgit@localhost.localdomain> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Sep 07, 2019 at 10:25:28AM -0700, Alexander Duyck wrote: > From: Alexander Duyck > > In order to support page reporting it will be necessary to store and > retrieve the migratetype of a page. To enable that I am moving the set and > get operations for pcppage_migratetype into the mm/internal.h header so > that they can be used outside of the page_alloc.c file. > > Reviewed-by: Dan Williams > Signed-off-by: Alexander Duyck I'm not sure that it's great idea to export this functionality beyond mm/page_alloc.c without any additional safeguards. How would we avoid to messing with ->index when the page is not in the right state of its life-cycle. Can we add some VM_BUG_ON()s here? -- Kirill A. Shutemov