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Tue, 20 Apr 2021 15:25:12 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 982F161264; Tue, 20 Apr 2021 15:25:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618932310; bh=MAjswkG1d6uIfyIvGoPH2JcXnT5VvPujn7l2uT7Uvj4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XWMQKAMU43ygxwHm/tIVp+WpJQapUl0Kd60x6HPlbDjcKHnf74tigDwWzGVjUZtAA tSdT+jZGx+d3ZPsKLu+jqBEA39bKT+7+0vr0dhyxEZGCpGlPxkgZ97678lO8WgGG4d QgW3tLOkl5mV+MxGBxxN5j8RAFrxIUGHaYegouiIHqIGoy34Dvfl8diR65SAtnm2sr Lmm/xaDLwYIOcOCnrqMkGqhYpZmIddlqTjCcrJUYJP4M5Cr95OivNBA3jWrHSClyG2 NlCodhM9dvGtr9D03VRf+IlIRcvRBQbVUFXaCEmYNLH08BeSOZ5UALddCrzzC0+Eer T0ouGAFTRdlJA== Date: Tue, 20 Apr 2021 18:25:01 +0300 From: Mike Rapoport To: David Hildenbrand Cc: linux-arm-kernel@lists.infradead.org, Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , Marc Zyngier , Mark Rutland , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v1 2/4] memblock: update initialization of reserved pages Message-ID: References: <20210420090925.7457-1-rppt@kernel.org> <20210420090925.7457-3-rppt@kernel.org> <45a7e13d-3e44-3b94-a253-2df72649a83d@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <45a7e13d-3e44-3b94-a253-2df72649a83d@redhat.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210420_082511_266995_304CF488 X-CRM114-Status: GOOD ( 19.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 20, 2021 at 05:18:55PM +0200, David Hildenbrand wrote: > On 20.04.21 17:03, Mike Rapoport wrote: > > On Tue, Apr 20, 2021 at 03:56:28PM +0200, David Hildenbrand wrote: > > > On 20.04.21 11:09, Mike Rapoport wrote: > > > > From: Mike Rapoport > > > > > > > > The struct pages representing a reserved memory region are initialized > > > > using reserve_bootmem_range() function. This function is called for each > > > > reserved region just before the memory is freed from memblock to the buddy > > > > page allocator. > > > > > > > > The struct pages for MEMBLOCK_NOMAP regions are kept with the default > > > > values set by the memory map initialization which makes it necessary to > > > > have a special treatment for such pages in pfn_valid() and > > > > pfn_valid_within(). > > > > > > Just a general question while thinking about it: > > > > > > Would we right now initialize the memmap of these pages already via > > > memmap_init_zone()->memmap_init_range()? (IOW, not marking the > > > PageReserved?) > > > > Yep. These pages are part of memblock.memory so they are initialized in > > memmap_init_zone()->memmap_init_range() to the default values. > > > > So instead of fully initializing them again, we mostly would only have to > set PageReserved(). Not sure how big that memory usually is -- IOW, if we > really care about optimizing the double-init. IIUC, these are small areas reserved by the firmware, like e.g. ACPI tables. @Ard, am I right? -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel