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Mon, 27 Feb 2023 09:37:01 -0800 (PST) Date: Mon, 27 Feb 2023 09:36:09 -0800 In-Reply-To: <20230227173632.3292573-1-surenb@google.com> Mime-Version: 1.0 References: <20230227173632.3292573-1-surenb@google.com> X-Mailer: git-send-email 2.39.2.722.g9855ee24e9-goog Message-ID: <20230227173632.3292573-11-surenb@google.com> Subject: [PATCH v4 10/33] 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, paulmck@kernel.org, mingo@redhat.com, will@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, chriscli@google.com, axelrasmussen@google.com, joelaf@google.com, minchan@google.com, rppt@kernel.org, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, leewalsh@google.com, posk@google.com, michalechner92@googlemail.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, Suren Baghdasaryan X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E6D77140004 X-Stat-Signature: n4x1n17jpywqyth7gx5p9ji8ogdd3r43 X-Rspam-User: X-HE-Tag: 1677519421-548033 X-HE-Meta: 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 klIjTlDD 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 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 | 20 +++++++++++++++++++- 2 files changed, 29 insertions(+), 4 deletions(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 22b2ac82bffd..64a6b3f6b74f 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -480,9 +480,16 @@ 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 abfcf95734c7..a63b739aeca9 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -479,12 +479,30 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig) return new; } -void vm_area_free(struct vm_area_struct *vma) +static void __vm_area_free(struct vm_area_struct *vma) { free_anon_vma_name(vma); kmem_cache_free(vm_area_cachep, vma); } +#ifdef CONFIG_PER_VMA_LOCK +static void vm_area_free_rcu_cb(struct rcu_head *head) +{ + struct vm_area_struct *vma = container_of(head, struct vm_area_struct, + vm_rcu); + __vm_area_free(vma); +} +#endif + +void vm_area_free(struct vm_area_struct *vma) +{ +#ifdef CONFIG_PER_VMA_LOCK + call_rcu(&vma->vm_rcu, vm_area_free_rcu_cb); +#else + __vm_area_free(vma); +#endif +} + static void account_kernel_stack(struct task_struct *tsk, int account) { if (IS_ENABLED(CONFIG_VMAP_STACK)) {