From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE7941F5EA for ; Sun, 5 Jul 2026 09:06:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783242398; cv=none; b=Lsj4RM2OUOYp78J7MUhlTI1OkuL4werhN7JNfcSZWIRcGWfobKlnEXptk4XzswqJX1E1RtW/kMeszxty1EHD0DAFXsPbODMxDyHXqS2f6yJVMZvKY8j0uOgHykbtuZfD/GtPO+0/M8L3k75VlmZyzWH7YvDQy9Puatlju2kl4P0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783242398; c=relaxed/simple; bh=1S9VScandDqQ7PKxFyzJGh2t7FG63XBlOht32fnohUk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AlhjO6+zj+Vsl7soMyl7QqdEc7R+Q7w9Uywq0pei0yY0g7sbH4BiDHq+GkmPSKNNhet9v0eozeRQzW3IHIECt6RJlz6P46eL1XyA51FUGixnU0nU3xwFT8HyKMq8jhMMRv/dXyS6I0hxl/LtsijgCrB+DUGBB1fcqyYXuTBH21A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=M3EVi/ZA; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=lZY/wPww; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="M3EVi/ZA"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="lZY/wPww" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1783242394; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Lwl2RZIgRGshSa/qt93sniK4Og2qca+KFPXUQBK5QlE=; b=M3EVi/ZAVKMzxUk0mZ4lxfTHf4gP1snPcP/wClGfnCKUe2KZk1UuNn9bGj+W33B5tOu4qu VrwQSCDLJ8CpnUaM2+37fTlXp8oFQgTp2zeRHKUicSHnVl4Md/AEpBjVBeaVjciDicXeff HqM+RPF9HFL9EDo9G0fV1b5p5kcS8zE= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-540-F-0WDAZsP3ydu3ZMstZqkw-1; Sun, 05 Jul 2026 05:06:33 -0400 X-MC-Unique: F-0WDAZsP3ydu3ZMstZqkw-1 X-Mimecast-MFC-AGG-ID: F-0WDAZsP3ydu3ZMstZqkw_1783242392 Received: by mail-wr1-f71.google.com with SMTP id ffacd0b85a97d-46fb9079a04so780511f8f.3 for ; Sun, 05 Jul 2026 02:06:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1783242392; x=1783847192; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=Lwl2RZIgRGshSa/qt93sniK4Og2qca+KFPXUQBK5QlE=; b=lZY/wPwwDLWOMv0Gm16ihcaknon0bsiSVCSJQ7wG+/hxpezXoTZt26xGblgW4v+7VW GL75/aItHQtw/e8yKCLZk7idCsRuf481r9iYP6Ctn2QH2kAcwgtdsDngsdB4J5I7avId TxO+sSr51qOM9RyCPcSERlHEYsyzZzx5LtersbgPJxLaoFn74hfM1d6P0oB3ueanWBN3 TseSGZnWjAN0VfCJ1V/hyX4/hb/qfMYCZL3nT9zDrrq9vUV4LQ3Rj7MIGg17tHVX1Yx1 TbJn83dgZswf8xh94LVe+a67A1vuhjV9+2sTV+bZjJVg5W7oTReRzDC/2F7TvAe9c0Yr 5+Lg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783242392; x=1783847192; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Lwl2RZIgRGshSa/qt93sniK4Og2qca+KFPXUQBK5QlE=; b=FsaacJupt5viN3x6qDPEgXzgcRb+uWQU3KJnNQWa5Ry8I3lTnX16qtBHQaeDWOKDCe RCBfnVk28qiFfAmFGaFpCqdP3Ve60QcDhyiURQF4WmtOjXJ4LmqGAxZMZLXdmP/o2PXQ pwuQTXmA5SyP43BDMdSEcNK04fkO3PGbxPufIIf5VBbXRBCB0coyTrssMZikIQlv4+iC UGfO60i1mTq5rUbH3+a0rkh17mN3m+pIKyeMzR4cCEQgr6yo0K+9o8eZX1JjOtQY4lBI YR/4bmYAlSnOB8If6sNqw6JMkiG7UWYphbWXMvBhdKzbMDHlIvSTkOhMfM2Vx+Utr/6p 1fAw== X-Gm-Message-State: AOJu0YwoVixLv9CFYrKOFTwOvbw1Y+rZtOKI92X8snftHoMzm+g6Dzxu LE8nC7HnlJZB9QjbqFImgN60kG/jOHX3j0O4k3prQAdggRjYDBLV4qM+nqCF79fFMfTuMvPqKAd yz/Vzz5dL6cYoY948H3MXWAvEhEBjJ4Vn9Wpa0RiUoZTuEWhGRQWSa6g1KHU++/lI7Q== X-Gm-Gg: AfdE7cmDFQNiOtzHI8Iqw8NaNF7aLEziPg8eaiiHbmNU0jnUPL++AqWaiFsRHBRPQMn 6lVLGY7MruFCjhXekk5RMuUVEzcTLleKdedBblST39E8S+sY8HWG07JB2642Y6uiXE3/ZPBJ9TR P5qOJWJ5g7Kz6eSJuBlKLQvXWLxez8dWOUKksvM5UHh1RyvBMcWuoql4BCcLDnFaXKauy4RdvzO pkk96i1OMoF2YrUHX9eePGj+idIrNcacng7NaJS+ZnOoRRfhHMhXJbXCmqHcI0QaRLO+Wwb/Stb XzK1sp0q9qJ0m2i+a3bgp/zjh18Sd6LArpTuLqMmUzjoRcMO1Wk8jYbBxLYpfNk53XidZ/PKETI FbiYX0Vn3gcyPKsX+qYZQtOuh44Xg9ZM7 X-Received: by 2002:adf:f390:0:b0:476:cb01:6393 with SMTP id ffacd0b85a97d-47aaba588demr5679055f8f.11.1783242391649; Sun, 05 Jul 2026 02:06:31 -0700 (PDT) X-Received: by 2002:adf:f390:0:b0:476:cb01:6393 with SMTP id ffacd0b85a97d-47aaba588demr5679022f8f.11.1783242391124; Sun, 05 Jul 2026 02:06:31 -0700 (PDT) Received: from redhat.com (IGLD-80-230-68-31.inter.net.il. [80.230.68.31]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0f2186bsm14405764f8f.36.2026.07.05.02.06.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Jul 2026 02:06:30 -0700 (PDT) Date: Sun, 5 Jul 2026 05:06:27 -0400 From: "Michael S. Tsirkin" To: Andrew Morton Cc: linux-kernel@vger.kernel.org, "David Hildenbrand (Arm)" , Gregory Price , Zi Yan , Pankaj Gupta , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Alexander Duyck , virtualization@lists.linux.dev, linux-mm@kvack.org Subject: Re: [PATCH v3] mm: page_reporting: allow driver to set batch capacity Message-ID: <20260705050445-mutt-send-email-mst@kernel.org> References: <444c24cf39f3f3620fc90ef4695bd6b0979f4c4b.1783232420.git.mst@redhat.com> <20260705011635.9974cac7f0defec9961e85c4@linux-foundation.org> <20260705042313-mutt-send-email-mst@kernel.org> <20260705013956.36f649b5cb13409d9088838a@linux-foundation.org> <20260705044139-mutt-send-email-mst@kernel.org> <20260705015116.bdf3335e9a955f057a6d9c5d@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260705015116.bdf3335e9a955f057a6d9c5d@linux-foundation.org> On Sun, Jul 05, 2026 at 01:51:16AM -0700, Andrew Morton wrote: > On Sun, 5 Jul 2026 04:42:38 -0400 "Michael S. Tsirkin" wrote: > > > On Sun, Jul 05, 2026 at 01:39:56AM -0700, Andrew Morton wrote: > > > On Sun, 5 Jul 2026 04:25:53 -0400 "Michael S. Tsirkin" wrote: > > > > > > > > > If capacity is 0 or exceeds PAGE_REPORTING_CAPACITY, it defaults > > > > > > to PAGE_REPORTING_CAPACITY. The 0 check and the clamping is done in > > > > > > page_reporting_register(), before the reporting work is scheduled, > > > > > > so we never get division by 0. > > > > > > > > > > Thanks. What's the priority here? Should we fix 7.2? Earlier? > > > > > > > > If possible, I'd like it in 7.2, have a setup like this (small > > > > queue is useful for perf testing). > > > > It's very early in the cycle and the code seems straight forward... > > > > I judge the chances of breaking anything is tiny because > > > > it just failed probe previously. > > > > > > No probs, I moved this to the the mm-hotfixes-unstable queue. No cc:stable. > > > > I suspect the Fixes tag will make their AI pick it anyway. But hey. > > -stable maintainers have been asked not to do that - only backport > patches which have an explicit cc:stable. Out of curiousity, is this specific to -mm? -- MST