From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C148C433E0 for ; Thu, 18 Mar 2021 18:04:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 711D064F1D for ; Thu, 18 Mar 2021 18:04:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 711D064F1D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=surriel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A00FD6B0074; Thu, 18 Mar 2021 14:04:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9D8606B0075; Thu, 18 Mar 2021 14:04:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8C7246B0078; Thu, 18 Mar 2021 14:04:46 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0068.hostedemail.com [216.40.44.68]) by kanga.kvack.org (Postfix) with ESMTP id 707526B0074 for ; Thu, 18 Mar 2021 14:04:46 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 1E5E618128714 for ; Thu, 18 Mar 2021 18:04:46 +0000 (UTC) X-FDA: 77933770572.19.B1B814F Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) by imf20.hostedemail.com (Postfix) with ESMTP id BB095145D for ; Thu, 18 Mar 2021 18:04:04 +0000 (UTC) Received: from imladris.surriel.com ([96.67.55.152]) by shelob.surriel.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lMx01-0001Hy-3u; Thu, 18 Mar 2021 14:03:57 -0400 Message-ID: <9d610d214ed8fcea9a236ec2fc54c39a5a841497.camel@surriel.com> Subject: Re: Page zapping and page table reclaim From: Rik van Riel To: David Hildenbrand , Linux Memory Management List Cc: Minchan Kim , Matthew Wilcox , Michal Hocko , Andrea Arcangeli , Peter Xu Date: Thu, 18 Mar 2021 14:03:56 -0400 In-Reply-To: References: Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-Tcehbj+U/ftIkFM8YRfn" User-Agent: Evolution 3.34.4 (3.34.4-1.fc31) MIME-Version: 1.0 X-Stat-Signature: 5b6g9nec3n5y7fa5sfw7gmyj76jje64z X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BB095145D Received-SPF: none (shelob.surriel.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=shelob.surriel.com; client-ip=96.67.55.147 X-HE-DKIM-Result: none/none X-HE-Tag: 1616090644-621659 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=-Tcehbj+U/ftIkFM8YRfn Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-03-11 at 19:14 +0100, David Hildenbrand wrote: > Hi folks, >=20 > I was wondering, is there any mechanism that reclaims basically > empty=20 > page tables in a running process? Currently we have do_munmap -> unmap_region -> free_pgtables, which is hooked up only to sys_munmap. We don't seem to have an equivalent for the various MADV_ options that lead to freed memory. --=20 All Rights Reversed. --=-Tcehbj+U/ftIkFM8YRfn Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEKR73pCCtJ5Xj3yADznnekoTE3oMFAmBTlgwACgkQznnekoTE 3oNWZwgAlOQHmZGi7DUYUiyqoRC7SuQDnSQd/bVfjN1ek1DS/igbnes8wg1xWos8 xJ9RBQrxLMqSXHJAVaHPtKP7WKBSuK4ifNJRIWZz5PkeiO6Bfm9GBx+1ADZIvp7S 9speP6ygFmgi7LP2bmkisAmgpg1JsIfTbLC3j3ZN1zKUVlqMH6naN+7y9oiHvnKe eldRzNlJLinkSN0+XMK/RkTjCjjfwqPUCTc45ABZVS4ULm8jBiicyBEuf6Ddrvv3 9JNat2+i37uiRwUiCtXPUmcnrhpbuwzq2m/YFgF9bO7RuColmu3kUSTPrxEUhUC0 xHhoaBvdqpUa9LXzQM47Vv63vwY5VA== =wgyh -----END PGP SIGNATURE----- --=-Tcehbj+U/ftIkFM8YRfn--