From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7114C79D0; Fri, 12 Jul 2024 01:22:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720747324; cv=none; b=bgmSA61WpnsfFyJ3VaIBx1YI/GdD4kyyYGLGmmrOXIJJmb3S2czP4n0zVxrp5XHVH9n7UQEcKOOGU9PAiBJXyFYqlY+IwffKPp5cVkTrtRNC1dxYRwM2yGHhYdb1vbY9ox5ERd4q2vO9LQ3i/hCUfa5X/RpW3xupdwanH7bh3lw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720747324; c=relaxed/simple; bh=dTBSXX4hldEV6E/8Mkykp19IfJ3WJRarA59YTkKILMc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Kv8+vq3yEKMvkjk0EPCoAFO6CcClOSAXcrNZc71yx/MUYvOlp/xuCL+iHhFjNd5qUgFSQsr1CpgiFISKw3rMa/5Bg9etfo7QHt69aXyUKUEc/6USIN/a/OnUrKPaba3kxoy5NvzwLHSbM3r2M7A4kNO2awx1ERhUxj81QYTdQ8w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b=WUkzWDQ4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="WUkzWDQ4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B04FC116B1; Fri, 12 Jul 2024 01:22:02 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="WUkzWDQ4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1720747320; 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=Vyt2PhgTl2/lcxLnHuVCD7bBc8rUbtA1ocfd2dkczEI=; b=WUkzWDQ4H72rOQrfYXBzv2Fy4QqEVW6ZNam5iC3qKQjmvFJL6T0fG91Ry8rwzVuTBFrNeA UT451cR3hgre90cMumR03BOsPaNtjH617Bh/Lmy9myVg+EIeUAvFUSbKprkJFrYJdkGECh flULe4Uo+6LqX8A7huoEeWhVwawPuN0= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 251cd471 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Fri, 12 Jul 2024 01:22:00 +0000 (UTC) Date: Fri, 12 Jul 2024 03:21:56 +0200 From: "Jason A. Donenfeld" To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev, tglx@linutronix.de, linux-crypto@vger.kernel.org, linux-api@vger.kernel.org, x86@kernel.org, Linus Torvalds , Greg Kroah-Hartman , Adhemerval Zanella Netto , Carlos O'Donell , Florian Weimer , Arnd Bergmann , Jann Horn , Christian Brauner , David Hildenbrand , linux-mm@kvack.org Subject: Re: [PATCH v22 1/4] mm: add MAP_DROPPABLE for designating always lazily freeable mappings Message-ID: References: <20240709130513.98102-1-Jason@zx2c4.com> <20240709130513.98102-2-Jason@zx2c4.com> <378f23cb-362e-413a-b221-09a5352e79f2@redhat.com> <5a875a3a-2243-4eab-856f-bc53ccfec3ea@redhat.com> Precedence: bulk X-Mailing-List: linux-api@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5a875a3a-2243-4eab-856f-bc53ccfec3ea@redhat.com> On Fri, Jul 12, 2024 at 12:29:17AM +0200, David Hildenbrand wrote: > > I'll try to think of some corner cases we might be missing. > > Sorry that I keep coming up with corner cases :) But these should be easy to handle: Thank you for coming up with them! > We don't want to suddenly get pages that are swapbacked. > Otherwise someone could place swapbacked pages in there (using UFFDIO_MOVE) Both seem like reasonable concerns. Added to v+1. Jason