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([2001:b07:6468:f312:7841:78cc:18c6:1e20]) by smtp.gmail.com with ESMTPSA id d11sm7576859wrw.77.2020.08.06.12.20.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Aug 2020 12:20:40 -0700 (PDT) Subject: Re: [RFC 16/16] lpfc: vmid: Introducing vmid in io path. To: Tejun Heo Cc: Muneendra Kumar M , James Smart , Hannes Reinecke , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, emilne@redhat.com, mkumar@redhat.com, Gaurav Srivastava , James Smart , Ming Lei References: <1596507196-27417-17-git-send-email-muneendra.kumar@broadcom.com> <61d2fd75-84ea-798b-aee9-b07957ac8f1b@suse.de> <08b9825b-6abb-c077-ac0d-bd63f10f2ac2@broadcom.com> <20200806144135.GC4520@mtj.thefacebook.com> <96930d0f-cb4d-94f4-9cbb-c82d2f0c3840@redhat.com> <20200806144804.GD4520@mtj.thefacebook.com> <20200806145901.GE4520@mtj.thefacebook.com> <8850c528-725f-c89a-cdc6-a9abada80a69@redhat.com> <20200806184920.GG4520@mtj.thefacebook.com> From: Paolo Bonzini Message-ID: Date: Thu, 6 Aug 2020 21:20:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200806184920.GG4520@mtj.thefacebook.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 06/08/20 20:49, Tejun Heo wrote: >> perf and bpf have file descriptors, system calls and data structures of >> their own, here there is simply none: it's just an array of chars. Can >> you explain _why_ it doesn't fit in the cgroupfs? > What's the hierarchical or delegation behavior? If a cgroup does not have an app identifier the driver should use the one from the closes parent that has one. > Why do the vast majority of > people who don't have the hardware or feature need to see it? We can argue > but I can pretty much guarantee that the conclusion is gonna be the same and > it's gonna be a waste of time and energy for both of us. I don't want to argue, I want to understand. My standard is that a maintainer that rejects code explains a plan for integrating with his subsystem and/or points to existing code that does something similar, rather than handwaving it away as something "that I can't remember off the top of my head". Thanks, Paolo