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([2601:282:803:7700:2840:9137:669d:d1e7]) by smtp.googlemail.com with ESMTPSA id v14sm3909630qtj.31.2020.05.27.15.21.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 May 2020 15:21:58 -0700 (PDT) Subject: Re: [PATCH v3 0/7] Statsfs: a new ram-based file system for Linux kernel statistics To: Paolo Bonzini , Jakub Kicinski , Emanuele Giuseppe Esposito Cc: kvm@vger.kernel.org, Christian Borntraeger , Jim Mattson , Alexander Viro , Emanuele Giuseppe Esposito , David Rientjes , Jonathan Adams , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, Andrew Lunn References: <20200526110318.69006-1-eesposit@redhat.com> <20200526153128.448bfb43@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> <6a754b40-b148-867d-071d-8f31c5c0d172@redhat.com> <20200527132321.54bcdf04@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> From: David Ahern Message-ID: Date: Wed, 27 May 2020 16:21:55 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On 5/27/20 3:07 PM, Paolo Bonzini wrote: > I see what you meant now. statsfs can also be used to enumerate objects > if one is so inclined (with the prototype in patch 7, for example, each > network interface becomes a directory). there are many use cases that have 100's to 1000's have network devices. Having a sysfs entry per device already bloats memory usage for these use cases; another filesystem with an entry per device makes that worse. Really the wrong direction for large scale systems.