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[91.12.100.186]) by smtp.gmail.com with ESMTPSA id t18sm8448740wrm.81.2021.10.11.09.46.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Oct 2021 09:46:17 -0700 (PDT) Subject: Re: [PATCH v4 0/7] util/oslib-posix: Support MADV_POPULATE_WRITE for os_mem_prealloc() To: qemu-devel@nongnu.org, Paolo Bonzini References: <20211004120208.7409-1-david@redhat.com> From: David Hildenbrand Organization: Red Hat Message-ID: Date: Mon, 11 Oct 2021 18:46:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20211004120208.7409-1-david@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.049, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , =?UTF-8?Q?Daniel_P_=2e_Berrang=c3=a9?= , Eduardo Habkost , "Michael S. Tsirkin" , "Dr . David Alan Gilbert" , Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 04.10.21 14:02, David Hildenbrand wrote: > #1 is a preparation for improved error reporting, #2 adds support for > MADV_POPULATE_WRITE, #3 cleans up the code to avoid global variables and > prepare for concurrency, #4 and #5 optimize thread handling, #6 makes > os_mem_prealloc() safe to be called from multiple threads concurrently and > #7 makes the SIGBUS handler coexist cleanly with the MCE SIGBUS handler > under Linux. > > Details regarding MADV_POPULATE_WRITE can be found in introducing upstream > Linux commits 4ca9b3859dac ("mm/madvise: introduce > MADV_POPULATE_(READ|WRITE) to prefault page tables") and eb2faa513c24 > ("mm/madvise: report SIGBUS as -EFAULT for MADV_POPULATE_(READ|WRITE)"), > and in the man page update [1]. Paolo, are you planning on taking this via your tree (POSIX)? Thanks! -- Thanks, David / dhildenb