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[174.95.95.253]) by smtp.gmail.com with ESMTPSA id i6sm6189160qkk.31.2021.03.02.09.55.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Mar 2021 09:55:49 -0800 (PST) Date: Tue, 2 Mar 2021 12:55:44 -0500 From: Peter Xu To: David Hildenbrand Subject: Re: [PATCH v1 9/9] hostmem: wire up RAM_NORESERVE via "reserve" property Message-ID: <20210302175544.GO397383@xz-x1> References: <20210209134939.13083-1-david@redhat.com> <20210209134939.13083-10-david@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210209134939.13083-10-david@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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: Thomas Huth , Cornelia Huck , Eduardo Habkost , "Michael S. Tsirkin" , Stefan Weil , Murilo Opsfelder Araujo , Richard Henderson , "Dr. David Alan Gilbert" , Juan Quintela , qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger , Greg Kurz , Stefan Hajnoczi , Igor Mammedov , Paolo Bonzini , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Igor Kotrasinski Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Feb 09, 2021 at 02:49:39PM +0100, David Hildenbrand wrote: > Let's provide a way to control the use of RAM_NORESERVE via memory > backends using the "reserve" property which defaults to true (old > behavior). > > Only POSIX supports setting the flag (and Linux support is checked at > runtime, depending on the setting of "/proc/sys/vm/overcommit_memory"). > Windows will bail out. > > The target use case is virtio-mem, which dynamically exposes memory > inside a large, sparse memory area to the VM. This essentially allows > avoiding to set "/proc/sys/vm/overcommit_memory == 0") when using > virtio-mem and also supporting hugetlbfs in the future. > > Signed-off-by: David Hildenbrand Reviewed-by: Peter Xu -- Peter Xu