From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792608762; b=c0cL3rHerZYfeP5lzdcCjOH0mQJDhX64y1NSgiIqpX+mcyHc/CowKCPVynBy/qcPAtYH pIMrk9mCZ/77hPoeQ8yKu12BX+YKnStHaD4FWFyOosb/lK69ZJ5Z7eluAzvD4vveNgN1B JmJpLzqwQ+sghye9YxoCpMm83pDl+Jw2XWqWwqjg4PJDSVn2/BrR5iz1o/Drlad2d+rlS s2osqtQojljpni57lEWQxi7XN3SBd5P2vdezhqJCsvBVX3vlaZrbHjt8sae60oGZfTNOi 9ZuwP3lCz6ui5iAFfgzbOUTxiS7+AZOQZb5SXLyMNIqjAPXSBnqIPd4M7HbLJJvxZZQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792608762; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-Id: In-Reply-To:References:X-Mailer:Mime-Version:Content-Type: Content-Transfer-Encoding; bh=9XNWFo/CYTANDrafjipXREwd0B+NLKGQLy/y5ee2/mU=; b=IsZQdVTMkc6fHcu4G7Oar1NzU2IjloCvIoFtrlfCxvPyVPwUPyMF/YxBkvhRlzC2hRrz WCU2iFHrI23kfwqFmC+7+JVEzfWlxvEB8r2h2tMiO0eNPdn7tvRu9NcN6q1XEJRJxAq+l es8Cmlttx3PJP4qF1wHdr+NTzovkbRw8O+H8jxHDPU5WbtK+se/4e3Ih/s1IYYC3qfFpT zBVL9xpEUp+SRK6sxC//rylFSsQojFUDxXuk8OuDayIdREHoonRu/fGgxSK5QabSsYHnW ymorGiY7GtIXhjz1fgcpttTT4cLzMIffuzJQ4N+IMJP2V/Xst+fjvRdjzzkg7/p6/Qg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=XVmYSRoE; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D0318606A319; Wed, 21 Oct 2026 18:52:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=XVmYSRoE Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1D5C1F000C1; Wed, 21 Oct 2026 18:52:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1792608761; bh=9XNWFo/CYTANDrafjipXREwd0B+NLKGQLy/y5ee2/mU=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=XVmYSRoE6euKHfFwnaiDhnpBmWGbT907C2lFpgaBfbpl4U+4ISxr9AqyT6pARcZaX wJeE56M0QsINp8WXWmFS8zXuVk/sMuPJxGXhNzXXM+zGK/e+2KGPy0jMuID4x8Ke3P C6pCbQm3HD1d/C4kmi/btMdNA8+N/HVKL7FgMmeU= Date: Wed, 21 Oct 2026 11:52:40 -0700 From: Andrew Morton To: Zhen Ni Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, brendan.jackman@linux.dev, hannes@cmpxchg.org, ziy@nvidia.com, shuah@kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Zhen Ni Subject: Re: [PATCH v3 0/7] mm/page_owner: add bpf_iter and kfuncs Message-Id: <20261021115240.f195a2a55364fe300cbb6983@linux-foundation.org> In-Reply-To: <20261021112437.1799213-1-zhen.ni@easystack.cn> References: <20261021112437.1799213-1-zhen.ni@easystack.cn> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 21 Oct 2026 19:24:30 +0800 Zhen Ni wrote: > page_owner records who allocated every page and is a core memory-debug > facility, but it currently reaches userspace as the debugfs flat dump: > slicing allocations by pid, comm, NUMA node, cgroup or stack, etc., > means streaming and parsing the entire file in userspace, which is > expensive on large hosts and hard to query live. Confused. Your series 8570b65220e8 ("mm/page_owner: add print_mode filter") addressed this significantly?