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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 9F948C433DB for ; Tue, 12 Jan 2021 16:14:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 593F022285 for ; Tue, 12 Jan 2021 16:14:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392683AbhALQOR (ORCPT ); Tue, 12 Jan 2021 11:14:17 -0500 Received: from aserp2130.oracle.com ([141.146.126.79]:53986 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391919AbhALQOP (ORCPT ); Tue, 12 Jan 2021 11:14:15 -0500 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CG9h9A086630; Tue, 12 Jan 2021 16:13:14 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=4XcJHq5+UWiuqXQlgJsObf/zPN4soZk45Nb1Uxfhv6E=; b=ilKvCQJIj8Hkv5RhP3s03IxsesYLuXeHTwrQV30m3CaFORuzPFok+WwfO0M25sucWym2 3vOmaYS7NuoiyHjdLlP3NoxKOTNzA9+ZtVGHUPfG8iWwdmWp5R6SEivC//BomsMocHRH j+MdZ0s2pj8r6xDu3FtdQmL0iyDAJphN0oDu85xHnl4+dOj7r1FcVN2XRR3xYrmKmqMl q1/SVBcJwNFVsQqx+0S4+x8TPTyyXRWavsruEMcaZTeKaZgDJ7j65PBJw5KI2uvj1p+c 7JOwkFDMi+ADk/+5KoHcy0kKIh8zRYkp1A0B0gpWzbkTjIn8szrdoQBod+j0fTMOOOxt QQ== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by aserp2130.oracle.com with ESMTP id 360kg1q4u2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:13:14 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 10CGBZ2N142889; Tue, 12 Jan 2021 16:13:14 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3020.oracle.com with ESMTP id 360ke6rg62-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 Jan 2021 16:13:14 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 10CGDCv7017522; Tue, 12 Jan 2021 16:13:12 GMT Received: from revolver.jebus.ca (/23.233.25.87) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 12 Jan 2021 08:13:12 -0800 From: "Liam R. Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , Song Liu , Davidlohr Bueso , "Paul E . McKenney" , Matthew Wilcox , Jerome Glisse , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra Subject: [PATCH v2 11/70] kernel/fork: Convert dup_mmap to use maple tree Date: Tue, 12 Jan 2021 11:11:41 -0500 Message-Id: <20210112161240.2024684-12-Liam.Howlett@Oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> References: <20210112161240.2024684-1-Liam.Howlett@Oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 suspectscore=0 spamscore=0 mlxlogscore=946 malwarescore=0 bulkscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9862 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 mlxscore=0 phishscore=0 mlxlogscore=937 bulkscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101120092 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use the maple tree iterator to duplicate the mm_struct trees. Signed-off-by: Liam R. Howlett --- include/linux/sched/mm.h | 3 +++ kernel/fork.c | 22 +++++++++++++++++----- 2 files changed, 20 insertions(+), 5 deletions(-) diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h index d5ece7a9a403f..919e2e44b764e 100644 --- a/include/linux/sched/mm.h +++ b/include/linux/sched/mm.h @@ -8,6 +8,7 @@ #include #include #include +#include /* * Routines for handling mm_structs @@ -67,11 +68,13 @@ static inline void mmdrop(struct mm_struct *mm) */ static inline void mmget(struct mm_struct *mm) { + mt_set_in_rcu(&mm->mm_mt); atomic_inc(&mm->mm_users); } static inline bool mmget_not_zero(struct mm_struct *mm) { + mt_set_in_rcu(&mm->mm_mt); return atomic_inc_not_zero(&mm->mm_users); } diff --git a/kernel/fork.c b/kernel/fork.c index 8c7273b0d4b77..8fcbd970666c3 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -472,7 +472,9 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, struct vm_area_struct *mpnt, *tmp, *prev, **pprev; struct rb_node **rb_link, *rb_parent; int retval; - unsigned long charge; + unsigned long charge = 0; + MA_STATE(old_mas, &oldmm->mm_mt, 0, 0); + MA_STATE(mas, &mm->mm_mt, 0, 0); LIST_HEAD(uf); uprobe_start_dup_mmap(); @@ -506,7 +508,12 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, goto out; prev = NULL; - for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) { + + retval = mas_entry_count(&mas, oldmm->map_count); + if (retval) + goto fail_nomem; + + mas_for_each(&old_mas, mpnt, ULONG_MAX) { struct file *file; if (mpnt->vm_flags & VM_DONTCOPY) { @@ -520,7 +527,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, */ if (fatal_signal_pending(current)) { retval = -EINTR; - goto out; + goto loop_out; } if (mpnt->vm_flags & VM_ACCOUNT) { unsigned long len = vma_pages(mpnt); @@ -589,7 +596,9 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, rb_parent = &tmp->vm_rb; /* Link the vma into the MT */ - vma_store(mm, tmp); + mas.index = tmp->vm_start; + mas.last = tmp->vm_end - 1; + mas_store(&mas, tmp); mm->map_count++; if (!(tmp->vm_flags & VM_WIPEONFORK)) @@ -599,14 +608,16 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, tmp->vm_ops->open(tmp); if (retval) - goto out; + goto loop_out; } /* a new mm has just been created */ retval = arch_dup_mmap(oldmm, mm); +loop_out: out: mmap_write_unlock(mm); flush_tlb_mm(oldmm); mmap_write_unlock(oldmm); + mas_destroy(&mas); dup_userfaultfd_complete(&uf); fail_uprobe_end: uprobe_end_dup_mmap(); @@ -1076,6 +1087,7 @@ static inline void __mmput(struct mm_struct *mm) { VM_BUG_ON(atomic_read(&mm->mm_users)); + mt_clear_in_rcu(&mm->mm_mt); uprobe_clear_state(mm); exit_aio(mm); ksm_exit(mm); -- 2.28.0