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Mon, 09 Jan 2023 12:54:03 -0800 (PST) Date: Mon, 9 Jan 2023 12:53:04 -0800 In-Reply-To: <20230109205336.3665937-1-surenb@google.com> Mime-Version: 1.0 References: <20230109205336.3665937-1-surenb@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230109205336.3665937-10-surenb@google.com> Subject: [PATCH 09/41] mm: rcu safe VMA freeing From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, laurent.dufour@fr.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com X-Stat-Signature: d6oq6cnxos9ahhps4us5z3i53cn7ds5i X-Rspam-User: X-Rspamd-Queue-Id: 9BDCB1A0003 X-Rspamd-Server: rspam06 X-HE-Tag: 1673297644-380758 X-HE-Meta: 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 LEZZ+pqL 8uIEy4z3VO7sW5Egdog2l8mmF711jQD2Pkya1faNtgQVeXGHUogFDhL1TM1QlTuNEQr8lRNsUaRaxTocR6LMxcfAnM4EM0uLsr8S4RsPA+rV6uEzdYsgvifHKzV9L/OCvj6TObXI6e6gu0sUV1cXNkBrtp4dXVWFhkfnYIssNSsAtBwAKSv48i3CjB1BowF1CHyMiU+W1qgN9F4RViTSysSAnig1XWtxe8uB2ndMmQuUCXFWntvkMYiG/+hCpakFLwtdUFIv5V5GVfzVcKOiN17zHiyA1w14gWB5gyeTTnyF+G50HiSSr/u/cCru4vUki4eoHG0o4dDXiZRP5h4bk1W5gemTy/nJrr9GLRIjNYl0nHoe1vpljPrGMBQ== 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: From: Michel Lespinasse This prepares for page faults handling under VMA lock, looking up VMAs under protection of an rcu read lock, instead of the usual mmap read lock. Signed-off-by: Michel Lespinasse Signed-off-by: Suren Baghdasaryan --- include/linux/mm_types.h | 13 ++++++++++--- kernel/fork.c | 13 +++++++++++++ 2 files changed, 23 insertions(+), 3 deletions(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 4b6bce73fbb4..d5cdec1314fe 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -535,9 +535,16 @@ struct anon_vma_name { struct vm_area_struct { /* The first cache line has the info for VMA tree walking. */ - unsigned long vm_start; /* Our start address within vm_mm. */ - unsigned long vm_end; /* The first byte after our end address - within vm_mm. */ + union { + struct { + /* VMA covers [vm_start; vm_end) addresses within mm */ + unsigned long vm_start; + unsigned long vm_end; + }; +#ifdef CONFIG_PER_VMA_LOCK + struct rcu_head vm_rcu; /* Used for deferred freeing. */ +#endif + }; struct mm_struct *vm_mm; /* The address space we belong to. */ diff --git a/kernel/fork.c b/kernel/fork.c index 58aab6c889a4..5986817f393c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -479,10 +479,23 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig) return new; } +#ifdef CONFIG_PER_VMA_LOCK +static void __vm_area_free(struct rcu_head *head) +{ + struct vm_area_struct *vma = container_of(head, struct vm_area_struct, + vm_rcu); + kmem_cache_free(vm_area_cachep, vma); +} +#endif + void vm_area_free(struct vm_area_struct *vma) { free_anon_vma_name(vma); +#ifdef CONFIG_PER_VMA_LOCK + call_rcu(&vma->vm_rcu, __vm_area_free); +#else kmem_cache_free(vm_area_cachep, vma); +#endif } static void account_kernel_stack(struct task_struct *tsk, int account)