From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAEDF218E85 for ; Fri, 24 Jan 2025 08:38:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737707902; cv=none; b=fru2uughdi10uHy+rhob6HWBdf+2ZUtFo+ThgFjRD0Z/cUVZ6GSHDR6Y+9Pytov6GLd2n1JxwZkOsY0F92a3LVSf5UZEcNM4ywKOV4AUUqgmiSx5vHKWv6VKoGnfdUhooxKQ55hOMeGUKBrlpVErrWhxtLT941+89h7LELNGIiM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737707902; c=relaxed/simple; bh=9tddCrPwZq+AKGA6FysyP+fBCq0+ub/7HsVtiuOI4UI=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=K9mh05dG9qZEK4dRv8w7gc/7NBFH5iyRk4880tNXAaLxFUWDH5W+bFZ6Z8y6BblOtLaGJ1JM37RipKy+IfPWBWXfiO540oS4H/REqAV0MikJIFgoi0PNVjU42QbLcgkB8ef8GLerGAoFEIUGWcyM1Lqu8wwbn05qb2ui7QTJDyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=S2KOUF1s; arc=none smtp.client-ip=209.85.216.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="S2KOUF1s" Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-2ee74291415so2599707a91.3 for ; Fri, 24 Jan 2025 00:38:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1737707900; x=1738312700; darn=vger.kernel.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=9tddCrPwZq+AKGA6FysyP+fBCq0+ub/7HsVtiuOI4UI=; b=S2KOUF1se5UwAw83s+bJv7LjVtoTq65NZLdT8uoCOPCJOHxJoDbDBiDTrJ8FbF1BtZ /RwYUMnYJlwLLKeclTciL3lyQhLfUHPro1YZ6N9CqiV1t2MdOcQCmlKxqkxI9m772Scs ZMyiULSAZHo47IuxIKz4RaXaN5meD3l4gjVKru8xvD2a8vsRWYK2vNVx+8zVeSySQ4e3 tv4W3PAKnsWpXz9ueGV0tPxJrcNMVvsOeB2gG0zgeRPz0XSPnzBEIa6ITvTqlIVPx+4p gBEaMtkzRoUjhajicxFtZU+FlyMHNDYL/W6JK5hRT8D0GbjaN3ZUNMqg4+1NX3t9a+Kl RwGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737707900; x=1738312700; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=9tddCrPwZq+AKGA6FysyP+fBCq0+ub/7HsVtiuOI4UI=; b=vGkUMutAh3UGbfrZJ1B0QOuuTKv++tNo2Ex9/UXSLwwuyPl9N780U06FhR/lRV690t 0YCb9N974mgcnlhWMZ/iaoowJLz145snN9lHyvSk8zLezLSK39fcu1v0RrZ6VPVoZKjh 8zk7ljmAgso7QzVy2x0eA+r4zGhV9s0m/YgcbW5X664TgCSapLgOVWXPHZJ/70a7WAJ8 6WJTO2lJ/sE9FeBtbUcWqEjdmptcmc4niJWSMgLQboFtdf8qsOGf8TBByqpTp9IlTLuD 0pC89gd41N7Z6vUHphsIRgCrCMtrfZMFnd/7m4ACh/D6ThJO499MKfwBWi8x8gi8ezyJ dKWQ== X-Forwarded-Encrypted: i=1; AJvYcCVd/Y0r11aQ9SPtoTzFsOnEq0At5+mnq+01qlk5OWoBJikSrnsP5gXWHiziBnv9Hno3bW3r+i1jumwQA+k=@vger.kernel.org X-Gm-Message-State: AOJu0YxcaHDVqAHZix8XIqCyGCG8vpAevegkT4wDKxnkqEAr2QRDCxtH pk6I5UF4lxiHFYfomvQCos0RPhTJK6BLKpCELM/dJ2NhFYYBOLglbSloDuBXGLDClB1UIaU55fu 28ZDOVNdDneAIB8xESxL31Mfwh1pNUTj0GEof X-Gm-Gg: ASbGncud0mVhPcZFVC5IgBz4sYWpTrP+/1Y8SuOv1EDYk1mzPi0Wwvm4KqzRxpFnEdt Sjmpn2vvfDCMJO1CDPsQPMH/Rnkabids3lvs0SRoWN20ZzCFYRGUzlydv8sokpqj54gRzwps2PV MOKEEKuaIXA/TkXDTlyA== X-Google-Smtp-Source: AGHT+IEZKMIErd/m+nXJGLBmsQwUn4sNJSBqhiaeDoFjEqgULKrwlHdpmZ0Q1HenaeqrwDllOoybmydJ1CP0sqieb10= X-Received: by 2002:a17:90b:3503:b0:2ee:9d65:65a7 with SMTP id 98e67ed59e1d1-2f782d7ff77mr40198898a91.29.1737707899764; Fri, 24 Jan 2025 00:38:19 -0800 (PST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20250123-kfence_doc_update-v1-1-9aa8e94b3d0b@gentwo.org> In-Reply-To: From: Marco Elver Date: Fri, 24 Jan 2025 09:37:43 +0100 X-Gm-Features: AWEUYZnsNQFUSJsERPtNV2HXTL_4mZGDJWzPTu4wScV_GdE309XO7yGCB5BQmXM Message-ID: Subject: Re: [PATCH] KFENCE: Clarify that sample allocations are not following NUMA or memory policies To: Vlastimil Babka Cc: cl@gentwo.org, Alexander Potapenko , Dmitry Vyukov , Jonathan Corbet , Andrew Morton , Yang Shi , Huang Shijie , kasan-dev@googlegroups.com, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Lameter Content-Type: text/plain; charset="UTF-8" On Fri, 24 Jan 2025 at 09:13, Vlastimil Babka wrote: > > On 1/23/25 23:44, Christoph Lameter via B4 Relay wrote: > > From: Christoph Lameter > > > > KFENCE manages its own pools and redirects regular memory allocations > > to those pools in a sporadic way. The usual memory allocator features > > like NUMA, memory policies and pfmemalloc are not supported. > > Can it also violate __GFP_THISNODE constraint? That could be a problem, I > recall a problem in the past where it could have been not honoured by the > page allocator, leading to corruption of slab lists. KFENCE does not sample page allocator allocations. Is kmalloc() allowed to take __GFP_THISNODE?