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Fri, 16 Oct 2020 18:49:03 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id CB138C433C9; Fri, 16 Oct 2020 18:49:03 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sudaraja) by smtp.codeaurora.org (Postfix) with ESMTPSA id ED731C433F1; Fri, 16 Oct 2020 18:49:02 +0000 (UTC) MIME-Version: 1.0 Date: Fri, 16 Oct 2020 11:49:02 -0700 From: Sudarshan Rajagopalan To: Will Deacon Subject: Re: [PATCH v3] arm64/mm: add fallback option to allocate virtually contiguous memory In-Reply-To: <20201015083605.GA4537@willie-the-truck> References: <20201015083605.GA4537@willie-the-truck> Message-ID: <541f79b6b5f3640c1e4978931ae93a38@codeaurora.org> X-Sender: sudaraja@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201016_144905_507676_48ACA4DE X-CRM114-Status: GOOD ( 18.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Gavin Shan , Anshuman Khandual , Catalin Marinas , David Hildenbrand , linux-kernel@vger.kernel.org, Steven Price , Andrew Morton , Logan Gunthorpe , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2020-10-15 01:36, Will Deacon wrote: > On Wed, Oct 14, 2020 at 05:51:23PM -0700, Sudarshan Rajagopalan wrote: >> When section mappings are enabled, we allocate vmemmap pages from >> physically continuous memory of size PMD_SIZE using >> vmemmap_alloc_block_buf(). Section mappings are good to reduce TLB >> pressure. But when system is highly fragmented and memory blocks are >> being hot-added at runtime, its possible that such physically >> continuous >> memory allocations can fail. Rather than failing the memory hot-add >> procedure, add a fallback option to allocate vmemmap pages from >> discontinuous pages using vmemmap_populate_basepages(). >> >> Signed-off-by: Sudarshan Rajagopalan >> Reviewed-by: Gavin Shan >> Reviewed-by: Anshuman Khandual >> Cc: Catalin Marinas >> Cc: Will Deacon >> Cc: Anshuman Khandual >> Cc: Mark Rutland >> Cc: Logan Gunthorpe >> Cc: David Hildenbrand >> Cc: Andrew Morton >> Cc: Steven Price >> --- >> arch/arm64/mm/mmu.c | 7 +++++-- >> 1 file changed, 5 insertions(+), 2 deletions(-) > > Please can you fix the subject? I have three copies of "PATCH v3" from > different days in my inbox. I know it sounds trivial, but getting these > little things right really helps with review, especially when it's > sitting > amongst a sea of other patches. Yes sure, sorry about that - will change it to "PATCH v4" to make it stand out from other patches. > > Thanks, > > Will Sudarshan -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel