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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847cb9f4c67sm1282608b3a.59.2026.07.02.05.17.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2026 05:17:16 -0700 (PDT) Date: Thu, 2 Jul 2026 05:17:13 -0700 From: Ashok Raj To: Ruidong Tian Cc: catalin.marinas@arm.com, will@kernel.org, rafael@kernel.org, tony.luck@intel.com, guohanjun@huawei.com, mchehab@kernel.org, xueshuai@linux.alibaba.com, tongtiangen@huawei.com, james.morse@arm.com, robin.murphy@arm.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, mpe@ellerman.id.au, npiggin@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, naveen.n.rao@linux.ibm.com, tglx@linutronix.de, mingo@redhat.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, Ashok Raj Subject: Re: [PATCH v15 0/8] arm64: add ARCH_HAS_COPY_MC support Message-ID: References: <20260618092124.3901230-1-tianruidong@linux.alibaba.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260618092124.3901230-1-tianruidong@linux.alibaba.com> X-Proofpoint-ORIG-GUID: v8KX2jBtoRwaLqQLOypf2joVfh1N_ZIi X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAyMDEyOCBTYWx0ZWRfX5GgqgiHINvpK 6S0THwRzbnpy8JUZKN2iTL/NBk+QUEpBNte2dgo9h6Vwkc7ZY4PAUNne3VFndlwbCUsy57FAhzk 7hRD14tjQ6w99C7NzTEUVsGPRnuTw7I= X-Proofpoint-GUID: v8KX2jBtoRwaLqQLOypf2joVfh1N_ZIi X-Authority-Analysis: v=2.4 cv=bOom5v+Z c=1 sm=1 tr=0 ts=6a4656cd cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=efi387GsBp53Kk3SMt4A:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAyMDEyOCBTYWx0ZWRfX/kNDIrRvN+K5 p49LYG7B5g/SLxB7CXJ4uPSKdtd5uF9RlQwRS61RKYub7WYAYlMCR60slYcISqriK5JhdItvPa+ GH9BoRMhk5O75vou9YZ5ItO2F+OZphzsnLnRanfS7N5aUYvWAwaVX1ZnnLJTdhzD4EC5dgbY4it OHnNQnJ6kjFu+4jZDEWMJQ4oe7Z6aw6OtlCPLZi2uxqlyx8E6YsTKsYFIeFcXQcARpGvS3w3nBq 5JA8qMYxgXWbuG+VK95h2Y+YwB/LFjNDBSfVlOvgWoc251nM+yY7PNwx8gQy7o+ueuqpAs0sKMf iwJNl6mTQ8EesMoLXSSm+FbXqs2gmgnzUcZ0KPJnKwtbvorxds7IWrgyXjcHN13IdZdDFqVzBUg wU7n7kfGHHPVE7PsrwiLedhO7q1avbrIcbxwyN1kqTQxXG1czYpWxIxs34XBcvMr/RjYEAjpQRf XxG2PVqnTd6ropjxgKg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-02_01,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 adultscore=0 clxscore=1011 suspectscore=0 phishscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607020128 On Thu, Jun 18, 2026 at 05:21:14PM +0800, Ruidong Tian wrote: > This series continues Tong Tiangen's work on arm64 ARCH_HAS_COPY_MC > support. We encounter the same problem, and from a forward-looking > perspective, large-memory ARM machines will suffer more from this class > of issues, which motivates us to push this feature upstream. > > Problem > ========= > With the increase of memory capacity and density, the probability of memory > error also increases. The increasing size and density of server RAM in data > centers and clouds have shown increased uncorrectable memory errors. > > Currently, more and more scenarios that can tolerate memory errors, such as > COW[1,2,8,9], KSM copy[3], coredump copy[4], khugepaged[5,6], uaccess copy[7], > page migration[10,11], etc. > Hi Ruidong, just a minor editorial nit :-) > [PATCH v15 0/8] arm64: add ARCH_HAS_COPY_MC support the series has 9 patches, but Subject says 0/8. Cheers, Ashok