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b=DRwt30jtwAkajLVWCwdOBKb12YYFw8pu2d2GnIsZg9cXJ6hJGeFXnQN3yRWBO0BFp U5W2Bs3KwF2sSJgDLe583LTl4Xz8YVMZ//eGB4ci6yQvdmz8rMuLS4HXaTxPnIj1PX wA1TrFSOi7E6w/9Vnv3hd5BeDXh3peJQZY670//SXB2x2jExtizL3AycLxadDz0U0q wmL+9GsU2DGlPm0FgS1lZvlO+h1ICn7ov6ctnS4amJgl20eNTLTpMnauV8EBmY2o1F HaLGXAWkS+5ymxHDEOMadxsy8F3QF4wx2ezvy0MVx8ldZv8Ij74Bo+Qi/Bod+6h3nX ABuJh67+3DksQ== Date: Mon, 10 Aug 2026 12:22:43 +0100 From: "Lorenzo Stoakes (ARM)" To: "David Hildenbrand (Arm)" Cc: Xiang Gao , Steven Rostedt , Andrew Morton , Masami Hiramatsu , Mathieu Desnoyers , liam@infradead.org, Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Xiang Gao Subject: Re: [PATCH] tracing: report buffer memory in /proc/meminfo Message-ID: References: <20260810094025.136705-1-gaoxiang17@xiaomi.com> <69df3080-a719-4131-a247-62bf47bda8a6@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <69df3080-a719-4131-a247-62bf47bda8a6@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 231F61C0009 X-Stat-Signature: x7qazy63dmsgfxm4fssrszszh74zx66n X-HE-Tag: 1786360982-304961 X-HE-Meta: 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 VjqXm57q jM/HWS/4GwVwluhq9zEjW2OlXuQov5/hAaBpkim2RLMdE3fcbnsLP1T10CpSmCUCvr6mhvs4esRzl58PmdaN+g3E68Hg2+kdUgqTyF84seC/hRMYMx2CdFQGb6ALtGP1RSqkDO1ScsKnZzI+35pNgYk9FcXWiUiCAKlS+OTw1u7DbePHdpqbftDX8BMZ4fFrP22Zbk1B+ePUcM1+YxHES1p2LdM4lN5Hy52q79ooxYByjwkMvgc9ErMsPXkEYd83Dgx8z Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 10, 2026 at 12:52:38PM +0200, David Hildenbrand (Arm) wrote: > On 8/10/26 11:40, Xiang Gao wrote: > > Report the data capacity of all ftrace ring buffers through a new Ftrace > > field in /proc/meminfo. Include the main and snapshot buffers of the > > global trace array and all tracing instances, while leaving ring-buffer > > metadata accounted for by Slab. > > why? :) > > To report a handful of KiB as in your example below? Doesn't sound super helpful > TBH. Yeah I think we need to stop with all the proposed additions to /proc/meminfo :) Also something like this where you are making a change in output that it is just your opinion that it is useful should be an RFC to see what the community thinks first. > > -- > Cheers, > > David -- Cheers, Lorenzo