gjdwebserver/gjdwebserver-overlay
gjdwebserver/gjdwebserver-overlay
3
0
Fork 0
Code Pull Requests Releases Activity
5dd8aa2bbd
gjdwebserver-overlay/sys-kernel/pinephone-sources/files/PATCH-v1-06-14-mm-x86-support-the-access-bit-on-non-leaf-PMD-entries.patch

203 lines
9.0 KiB
Diff
Raw Normal View History

Added sources
2021-04-12 10:32:32 +02:00
From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED,
DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,
USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 CFB78C43331
for <linux-kernel@archiver.kernel.org>; Sat, 13 Mar 2021 07:59:06 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
by mail.kernel.org (Postfix) with ESMTP id A37AF64F1E
for <linux-kernel@archiver.kernel.org>; Sat, 13 Mar 2021 07:59:06 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S233446AbhCMH6j (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
Sat, 13 Mar 2021 02:58:39 -0500
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58976 "EHLO
lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
with ESMTP id S232627AbhCMH6F (ORCPT
<rfc822;linux-kernel@vger.kernel.org>);
Sat, 13 Mar 2021 02:58:05 -0500
Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a])
by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF963C061574
for <linux-kernel@vger.kernel.org>; Fri, 12 Mar 2021 23:58:04 -0800 (PST)
Received: by mail-qt1-x84a.google.com with SMTP id a16so3377560qtw.1
for <linux-kernel@vger.kernel.org>; Fri, 12 Mar 2021 23:58:04 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=google.com; s=20161025;
h=date:in-reply-to:message-id:mime-version:references:subject:from:to
:cc;
bh=9FOrNXENvEBq+xjcXdvWYV76Tj/52PeZfpdHZpBdeTw=;
b=CZNFSLn1Vr+7g91u2WdSPY2RASOoMeGVnEu8XS9ogwps7Gq+7F5umE3fWsyowJpBWD
/BpSgazEV0uTx/142ccxmLjj6Tc5kR7KGsb79Ptj4azaGNuJBT032A7MXAqita6Xkryl
6IanFkwVS4tC+SsZAZtk+kuQzdp1pO5Pnx+cXwdQzEVQmCkWjuUnjKzoEPGf4IlnkcFb
QOa5YU3bEwcfmAFIwkc2tWsdZ2h8rKKycxzT/zHBKI265GiGZGNofgaHIdU33DduoJGc
Q3y72dvencUMJG5nccrm3sqMC+9s98wb5AiyP7gwQH8cNu/oUBPDF/k1zMnv1QbL0y4q
Wkmw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:date:in-reply-to:message-id:mime-version
:references:subject:from:to:cc;
bh=9FOrNXENvEBq+xjcXdvWYV76Tj/52PeZfpdHZpBdeTw=;
b=dwfL2qqtOLyHknmJLTbNquIIE99M3co4RRcjM8ZHW7E3b22r0qS7/uSdIuLxhwPvQA
Y3LL2jZN2S3rNEY31iqcQo0XPmDjtQwb13jd9vmVGL+LLS5tszC4uUapyiV0oPCH5uwL
smIUxO+PPvwuZT1NgqDpJ05pyAL6HNc5tjDAhFLsgZFN/eS2938P25wiN4+HDX1vPlLc
PXD85IpbqplkrTukFj4waHLj2xp8v/FPA9XzbBiYpaKEr1bL5w6oyKCxl6mnhZr0A9h6
m3QW2oQAPQpKG6YqSR4gB8S9wvQ5RcQOj/4jcVgdKH2lIq48/Tc9tYuJNF3HuISISSMR
K2Aw==
X-Gm-Message-State: AOAM530QAe48ahNQ/TdZi8OsNzl8PRShs8X4B4mC6ejSQSSJgG9mU0dS
C8+Z0ZLOLiEDu/n5izcyhgbt0bjgPuM=
X-Google-Smtp-Source: ABdhPJx3v9fo9fGIto8kHzW5LTGjVA6UTKRtTeuo4NwnDLlQop9mIBVZK8pHZLGtADbIHe5kSQ6HeS7hVrU=
X-Received: from yuzhao.bld.corp.google.com ([2620:15c:183:200:f931:d3e4:faa0:4f74])
(user=yuzhao job=sendgmr) by 2002:a0c:cb0c:: with SMTP id o12mr15467752qvk.54.1615622284101;
Fri, 12 Mar 2021 23:58:04 -0800 (PST)
Date: Sat, 13 Mar 2021 00:57:39 -0700
In-Reply-To: <20210313075747.3781593-1-yuzhao@google.com>
Message-Id: <20210313075747.3781593-7-yuzhao@google.com>
Mime-Version: 1.0
References: <20210313075747.3781593-1-yuzhao@google.com>
X-Mailer: git-send-email 2.31.0.rc2.261.g7f71774620-goog
Subject: [PATCH v1 06/14] mm, x86: support the access bit on non-leaf PMD entries
From: Yu Zhao <yuzhao@google.com>
To: linux-mm@kvack.org
Cc: Alex Shi <alex.shi@linux.alibaba.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Hillf Danton <hdanton@sina.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Matthew Wilcox <willy@infradead.org>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.com>,
Roman Gushchin <guro@fb.com>, Vlastimil Babka <vbabka@suse.cz>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Yang Shi <shy828301@gmail.com>,
Ying Huang <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, page-reclaim@google.com,
Yu Zhao <yuzhao@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Archived-At: <https://lore.kernel.org/lkml/20210313075747.3781593-7-yuzhao@google.com/>
List-Archive: <https://lore.kernel.org/lkml/>
List-Post: <mailto:linux-kernel@vger.kernel.org>
Some architectures support the accessed bit on non-leaf PMD entries
(parents) in addition to leaf PTE entries (children) where pages are
mapped, e.g., x86_64 sets the accessed bit on a parent when using it
as part of linear-address translation [1]. Page table walkers who are
interested in the accessed bit on children can take advantage of this:
they do not need to search the children when the accessed bit is not
set on a parent, given that they have previously cleared the accessed
bit on this parent in addition to its children.
[1]: Intel 64 and IA-32 Architectures Software Developer's Manual
Volume 3 (October 2019), section 4.8
Signed-off-by: Yu Zhao <yuzhao@google.com>
---
arch/Kconfig | 8 ++++++++
arch/x86/Kconfig | 1 +
arch/x86/include/asm/pgtable.h | 2 +-
arch/x86/mm/pgtable.c | 5 ++++-
include/linux/pgtable.h | 4 ++--
5 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 2bb30673d8e6..137446d17732 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -783,6 +783,14 @@ config HAVE_ARCH_TRANSPARENT_HUGEPAGE
config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
bool
+config HAVE_ARCH_PARENT_PMD_YOUNG
+ bool
+ help
+ Architectures that select this are able to set the accessed bit on
+ non-leaf PMD entries in addition to leaf PTE entries where pages are
+ mapped. For them, page table walkers that clear the accessed bit may
+ stop at non-leaf PMD entries when they do not see the accessed bit.
+
config HAVE_ARCH_HUGE_VMAP
bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2792879d398e..b5972eb82337 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -163,6 +163,7 @@ config X86
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
+ select HAVE_ARCH_PARENT_PMD_YOUNG if X86_64
select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD
select HAVE_ARCH_VMAP_STACK if X86_64
select HAVE_ARCH_WITHIN_STACK_FRAMES
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index a02c67291cfc..a6b5cfe1fc5a 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -846,7 +846,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd)
static inline int pmd_bad(pmd_t pmd)
{
- return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
+ return ((pmd_flags(pmd) | _PAGE_ACCESSED) & ~_PAGE_USER) != _KERNPG_TABLE;
}
static inline unsigned long pages_to_mb(unsigned long npg)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index f6a9e2e36642..1c27e6f43f80 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -550,7 +550,7 @@ int ptep_test_and_clear_young(struct vm_area_struct *vma,
return ret;
}
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG)
int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
@@ -562,6 +562,9 @@ int pmdp_test_and_clear_young(struct vm_area_struct *vma,
return ret;
}
+#endif
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int pudp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pud_t *pudp)
{
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 5e772392a379..08dd9b8c055a 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -193,7 +193,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG)
static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address,
pmd_t *pmdp)
@@ -214,7 +214,7 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
BUILD_BUG();
return 0;
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG */
#endif
#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
--
2.31.0.rc2.261.g7f71774620-goog
Copy Permalink