From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f45.google.com (mail-ed1-f45.google.com [209.85.208.45]) (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 9B7CF23F28E for ; Wed, 15 Jan 2025 08:35:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736930137; cv=none; b=QBxYmpu6YVijIQQ+FbnbPTJ43ulgU6I8pC63kHVjEHq0x+fnez3+xg8lO5T838R2a7u5+nQ3+KU9AcFwS36XeEUySyWiwOca5iCz7Qjt2SqOZEDYKo8+YDdtKBDrTPc+XCAB+f1IHx1Rvs9CnylbesKNDnEBKHsAsmYc9jTB9LY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736930137; c=relaxed/simple; bh=2gIseYm5Pj57WexPP3Rw1jQOuq/dpfcgpOlwB79/99k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fytAWxNIMRTMV89i7oznXPljm8FZzMxCuxwfoOcI6Y6waK3jjeGLvgOYVmXl0EIpXFes9GNYLlEl8pLu2eAuNgEvAwToWYBoFpGIQaXMj6KKJ08zHnxodJMY2lrumebWjTOut6Sm47gOrgoSNWDI6sMPKH9AUiAXGNBB+efAePk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=CwYQxqxy; arc=none smtp.client-ip=209.85.208.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="CwYQxqxy" Received: by mail-ed1-f45.google.com with SMTP id 4fb4d7f45d1cf-5da12190e75so631832a12.1 for ; Wed, 15 Jan 2025 00:35:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1736930134; x=1737534934; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=ohckFtnVSpeCCeKoPpAJ4ruZVbU0fXwtskjaCjfmHjA=; b=CwYQxqxyfXpKVVDcmw/xrRVsjRzOfOOW/8KWpOVFs6UhMVaggDTaYjN4SWp2xKCjyJ W2cVADClgf+jWKV8w+EHbuXBdJtEONPIAft5xLnYxmAw1fiK+7N+m677MyujPQcCMad1 pu2P6+LixAS9R4TZK2n+cr2NDrz0YUq4a7QMjGlL47CB3TCSrtPsvHfh88EUIhvWytsi vg7WK4tu/trwrWd2Qqly0q3uf9/mtfQ9wz3fmHswE19X2sORtStb4tsQGWps/weDZy3U zs+0KRxBxeEQ0371MAgW9mc2smJvh1e/JFzLG84Fi3St7gr9Bot61x9kMVYvWqCly4sF CjSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736930134; x=1737534934; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ohckFtnVSpeCCeKoPpAJ4ruZVbU0fXwtskjaCjfmHjA=; b=Y9zhhxcQSvlEgUvY80kyDfRbRgaCXcOqtIzgMg4/rJW+dtPZSWY1ngFYrss1h5tpZF yeD4CADf2x7bdyyf5rqpJ18iU70RmqRs3wTPA5wR8fP/6yq3n/RogsnlGnv9MZPyIefA jzT6IAByE/oQBDT+v1PAuYVGqirIfU3LpUK719YfM3UF8jq7Aq/OWz01Am40zyBvVhM7 oPgdiqSdASCQ19HafTnBazduMsxHIEQoHAoLr5yJUXC2/0M/DfW0DmDSMMSlXUrQm/bd ITOqknHmMchNLG+XdZX8P5OZGUFf9p3GP2ixqn0bL6WnTEeSOn8OP/ckZT8ph7mc9S+s HEHg== X-Gm-Message-State: AOJu0YxbosuFGH6VqCq/+P7LAiHtehUkHJi6twsTuRdMrn/YFXEcR9ku Dvwj7t0rMTIYm9vuF9E2agcN50GJNjTF4uWpqdD5ZY4mtjdq94ZK23ZWpTRzZw4= X-Gm-Gg: ASbGncuYpNlvJvHWSx6Ts1v7V7tjhGvCBk/LtWO5Mmzl6+wS5Mz4/9LtUXdl97mcFHp 9l7x5aH8tAsQXJAkETZTkliNDpWlSVxtwth6s2yxPjfDSVednIpI1T2voCcoxfDe0X+r4NSmPx5 k2ycXHwaDCXr1JuORXQ5mST+lf/2IOBT3duUWg2kybu5bJxKERIMZkTuRu5o3sfAM+oPO2/hRoa 7f9PUResWqvh/rkqK5a249ZzPWwYDVf+s3GcNB+YkVB3UB1dO0NIm/ewvf/5ExxLpn5+Q== X-Google-Smtp-Source: AGHT+IH1XvUSwlBsKXdAp5KWg/uU35nzOhQAzruJlcZgkjRfjrqnrWD22y+Q3zPdJAsxJsmOfU4B8A== X-Received: by 2002:a05:6402:2347:b0:5d9:f042:dab with SMTP id 4fb4d7f45d1cf-5d9f0421161mr8073747a12.18.1736930133690; Wed, 15 Jan 2025 00:35:33 -0800 (PST) Received: from localhost (109-81-90-202.rct.o2.cz. [109.81.90.202]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5d9903c4477sm6895267a12.51.2025.01.15.00.35.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jan 2025 00:35:33 -0800 (PST) Date: Wed, 15 Jan 2025 09:35:32 +0100 From: Michal Hocko To: Alexei Starovoitov Cc: bpf , Andrii Nakryiko , Kumar Kartikeya Dwivedi , Andrew Morton , Peter Zijlstra , Vlastimil Babka , Sebastian Sewior , Steven Rostedt , Hou Tao , Johannes Weiner , Shakeel Butt , Matthew Wilcox , Thomas Gleixner , Jann Horn , Tejun Heo , linux-mm , Kernel Team Subject: Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation Message-ID: References: <20250114021922.92609-1-alexei.starovoitov@gmail.com> <20250114021922.92609-2-alexei.starovoitov@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue 14-01-25 17:23:20, Alexei Starovoitov wrote: > On Tue, Jan 14, 2025 at 2:31 AM Michal Hocko wrote: [...] > > LGTM, I am not entirely clear on kmsan_alloc_page part though. > > Which part is still confusing? It is not confusing as much as I have no idea how the kmsan code is supposed to work. Why do we even need to memset if __GFP_ZERO is used. -- Michal Hocko SUSE Labs