From: Byungchul Park <byungchul.park@lge.com> To: torvalds@linux-foundation.org Cc: damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, bfields@fieldses.org, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, paolo.valente@linaro.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, jack@suse.com, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com Subject: [PATCH RFC v5 03/21] dept: Embed Dept data in Lockdep Date: Wed, 16 Mar 2022 11:26:15 +0900 [thread overview] Message-ID: <1647397593-16747-4-git-send-email-byungchul.park@lge.com> (raw) In-Reply-To: <1647397593-16747-1-git-send-email-byungchul.park@lge.com> Dept should work independently from Lockdep. However, there's no choise but to rely on Lockdep code and its instances for now. Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- include/linux/lockdep.h | 72 ++++++++++++++++++++++++++++++++++++++++--- include/linux/lockdep_types.h | 3 ++ kernel/locking/lockdep.c | 12 ++++---- 3 files changed, 77 insertions(+), 10 deletions(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 467b942..2aab445 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -20,6 +20,33 @@ extern int prove_locking; extern int lock_stat; +#ifdef CONFIG_DEPT +static inline void dept_after_copy_map(struct dept_map *to, + struct dept_map *from) +{ + int i; + + if (from->keys == &from->keys_local) + to->keys = &to->keys_local; + + if (!to->keys) + return; + + /* + * Since the class cache can be modified concurrently we could observe + * half pointers (64bit arch using 32bit copy insns). Therefore clear + * the caches and take the performance hit. + * + * XXX it doesn't work well with lockdep_set_class_and_subclass(), since + * that relies on cache abuse. + */ + for (i = 0; i < DEPT_MAX_SUBCLASSES_CACHE; i++) + to->keys->classes[i] = NULL; +} +#else +#define dept_after_copy_map(t, f) do { } while (0) +#endif + #ifdef CONFIG_LOCKDEP #include <linux/linkage.h> @@ -43,6 +70,8 @@ static inline void lockdep_copy_map(struct lockdep_map *to, */ for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++) to->class_cache[i] = NULL; + + dept_after_copy_map(&to->dmap, &from->dmap); } /* @@ -176,8 +205,19 @@ struct held_lock { current->lockdep_recursion -= LOCKDEP_OFF; \ } while (0) -extern void lockdep_register_key(struct lock_class_key *key); -extern void lockdep_unregister_key(struct lock_class_key *key); +extern void __lockdep_register_key(struct lock_class_key *key); +extern void __lockdep_unregister_key(struct lock_class_key *key); + +#define lockdep_register_key(k) \ +do { \ + __lockdep_register_key(k); \ + dept_key_init(&(k)->dkey); \ +} while (0) +#define lockdep_unregister_key(k) \ +do { \ + __lockdep_unregister_key(k); \ + dept_key_destroy(&(k)->dkey); \ +} while (0) /* * These methods are used by specific locking variants (spinlocks, @@ -185,9 +225,18 @@ struct held_lock { * to lockdep: */ -extern void lockdep_init_map_type(struct lockdep_map *lock, const char *name, +extern void __lockdep_init_map_type(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type); +#define lockdep_init_map_type(l, n, k, s, i, o, t) \ +do { \ + __lockdep_init_map_type(l, n, k, s, i, o, t); \ + if ((k) == &__lockdep_no_validate__) \ + dept_map_nocheck(&(l)->dmap); \ + else \ + dept_map_init(&(l)->dmap, &(k)->dkey, s, n); \ +} while (0) + static inline void lockdep_init_map_waits(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer) @@ -431,13 +480,28 @@ enum xhlock_context_t { XHLOCK_CTX_NR, }; +#ifdef CONFIG_DEPT +/* + * TODO: I found the case to use an address of other than a real key as + * _key, for instance, in workqueue. So for now, we cannot use the + * assignment like '.dmap.keys = &(_key)->dkey' unless it's fixed. + */ +#define STATIC_DEPT_MAP_INIT(_name, _key) .dmap = { \ + .name = (_name), \ + .keys = NULL, \ + }, +#else +#define STATIC_DEPT_MAP_INIT(_name, _key) +#endif + #define lockdep_init_map_crosslock(m, n, k, s) do {} while (0) /* * To initialize a lockdep_map statically use this macro. * Note that _name must not be NULL. */ #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ - { .name = (_name), .key = (void *)(_key), } + { .name = (_name), .key = (void *)(_key), \ + STATIC_DEPT_MAP_INIT(_name, _key) } static inline void lockdep_invariant_state(bool force) {} static inline void lockdep_free_task(struct task_struct *task) {} diff --git a/include/linux/lockdep_types.h b/include/linux/lockdep_types.h index d224308..50c8879 100644 --- a/include/linux/lockdep_types.h +++ b/include/linux/lockdep_types.h @@ -11,6 +11,7 @@ #define __LINUX_LOCKDEP_TYPES_H #include <linux/types.h> +#include <linux/dept.h> #define MAX_LOCKDEP_SUBCLASSES 8UL @@ -76,6 +77,7 @@ struct lock_class_key { struct hlist_node hash_entry; struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; }; + struct dept_key dkey; }; extern struct lock_class_key __lockdep_no_validate__; @@ -185,6 +187,7 @@ struct lockdep_map { int cpu; unsigned long ip; #endif + struct dept_map dmap; }; struct pin_cookie { unsigned int val; }; diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index f8a0212..e324d61 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -1184,7 +1184,7 @@ static inline struct hlist_head *keyhashentry(const struct lock_class_key *key) } /* Register a dynamically allocated key. */ -void lockdep_register_key(struct lock_class_key *key) +void __lockdep_register_key(struct lock_class_key *key) { struct hlist_head *hash_head; struct lock_class_key *k; @@ -1207,7 +1207,7 @@ void lockdep_register_key(struct lock_class_key *key) restore_irqs: raw_local_irq_restore(flags); } -EXPORT_SYMBOL_GPL(lockdep_register_key); +EXPORT_SYMBOL_GPL(__lockdep_register_key); /* Check whether a key has been registered as a dynamic key. */ static bool is_dynamic_key(const struct lock_class_key *key) @@ -4771,7 +4771,7 @@ static inline int check_wait_context(struct task_struct *curr, /* * Initialize a lock instance's lock-class mapping info: */ -void lockdep_init_map_type(struct lockdep_map *lock, const char *name, +void __lockdep_init_map_type(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type) { @@ -4831,7 +4831,7 @@ void lockdep_init_map_type(struct lockdep_map *lock, const char *name, raw_local_irq_restore(flags); } } -EXPORT_SYMBOL_GPL(lockdep_init_map_type); +EXPORT_SYMBOL_GPL(__lockdep_init_map_type); struct lock_class_key __lockdep_no_validate__; EXPORT_SYMBOL_GPL(__lockdep_no_validate__); @@ -6291,7 +6291,7 @@ void lockdep_reset_lock(struct lockdep_map *lock) } /* Unregister a dynamically allocated key. */ -void lockdep_unregister_key(struct lock_class_key *key) +void __lockdep_unregister_key(struct lock_class_key *key) { struct hlist_head *hash_head = keyhashentry(key); struct lock_class_key *k; @@ -6326,7 +6326,7 @@ void lockdep_unregister_key(struct lock_class_key *key) /* Wait until is_dynamic_key() has finished accessing k->hash_entry. */ synchronize_rcu(); } -EXPORT_SYMBOL_GPL(lockdep_unregister_key); +EXPORT_SYMBOL_GPL(__lockdep_unregister_key); void __init lockdep_init(void) { -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Byungchul Park <byungchul.park@lge.com> To: torvalds@linux-foundation.org Cc: hamohammed.sa@gmail.com, jack@suse.cz, peterz@infradead.org, daniel.vetter@ffwll.ch, amir73il@gmail.com, david@fromorbit.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, bfields@fieldses.org, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, joel@joelfernandes.org, cl@linux.com, will@kernel.org, duyuyang@gmail.com, sashal@kernel.org, paolo.valente@linaro.org, damien.lemoal@opensource.wdc.com, willy@infradead.org, hch@infradead.org, airlied@linux.ie, mingo@redhat.com, djwong@kernel.org, vdavydov.dev@gmail.com, rientjes@google.com, dennis@kernel.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, johannes.berg@intel.com, jack@suse.com, dan.j.williams@intel.com, josef@toxicpanda.com, rostedt@goodmis.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, jglisse@redhat.com, viro@zeniv.linux.org.uk, tglx@linutronix.de, mhocko@kernel.org, vbabka@suse.cz, melissa.srw@gmail.com, sj@kernel.org, tytso@mit.edu, rodrigosiqueiramelo@gmail.com, kernel-team@lge.com, gregkh@linuxfoundation.org, jlayton@kernel.org, linux-kernel@vger.kernel.org, penberg@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, tj@kernel.org, akpm@linux-foundation.org Subject: [PATCH RFC v5 03/21] dept: Embed Dept data in Lockdep Date: Wed, 16 Mar 2022 11:26:15 +0900 [thread overview] Message-ID: <1647397593-16747-4-git-send-email-byungchul.park@lge.com> (raw) In-Reply-To: <1647397593-16747-1-git-send-email-byungchul.park@lge.com> Dept should work independently from Lockdep. However, there's no choise but to rely on Lockdep code and its instances for now. Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- include/linux/lockdep.h | 72 ++++++++++++++++++++++++++++++++++++++++--- include/linux/lockdep_types.h | 3 ++ kernel/locking/lockdep.c | 12 ++++---- 3 files changed, 77 insertions(+), 10 deletions(-) diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 467b942..2aab445 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -20,6 +20,33 @@ extern int prove_locking; extern int lock_stat; +#ifdef CONFIG_DEPT +static inline void dept_after_copy_map(struct dept_map *to, + struct dept_map *from) +{ + int i; + + if (from->keys == &from->keys_local) + to->keys = &to->keys_local; + + if (!to->keys) + return; + + /* + * Since the class cache can be modified concurrently we could observe + * half pointers (64bit arch using 32bit copy insns). Therefore clear + * the caches and take the performance hit. + * + * XXX it doesn't work well with lockdep_set_class_and_subclass(), since + * that relies on cache abuse. + */ + for (i = 0; i < DEPT_MAX_SUBCLASSES_CACHE; i++) + to->keys->classes[i] = NULL; +} +#else +#define dept_after_copy_map(t, f) do { } while (0) +#endif + #ifdef CONFIG_LOCKDEP #include <linux/linkage.h> @@ -43,6 +70,8 @@ static inline void lockdep_copy_map(struct lockdep_map *to, */ for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++) to->class_cache[i] = NULL; + + dept_after_copy_map(&to->dmap, &from->dmap); } /* @@ -176,8 +205,19 @@ struct held_lock { current->lockdep_recursion -= LOCKDEP_OFF; \ } while (0) -extern void lockdep_register_key(struct lock_class_key *key); -extern void lockdep_unregister_key(struct lock_class_key *key); +extern void __lockdep_register_key(struct lock_class_key *key); +extern void __lockdep_unregister_key(struct lock_class_key *key); + +#define lockdep_register_key(k) \ +do { \ + __lockdep_register_key(k); \ + dept_key_init(&(k)->dkey); \ +} while (0) +#define lockdep_unregister_key(k) \ +do { \ + __lockdep_unregister_key(k); \ + dept_key_destroy(&(k)->dkey); \ +} while (0) /* * These methods are used by specific locking variants (spinlocks, @@ -185,9 +225,18 @@ struct held_lock { * to lockdep: */ -extern void lockdep_init_map_type(struct lockdep_map *lock, const char *name, +extern void __lockdep_init_map_type(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type); +#define lockdep_init_map_type(l, n, k, s, i, o, t) \ +do { \ + __lockdep_init_map_type(l, n, k, s, i, o, t); \ + if ((k) == &__lockdep_no_validate__) \ + dept_map_nocheck(&(l)->dmap); \ + else \ + dept_map_init(&(l)->dmap, &(k)->dkey, s, n); \ +} while (0) + static inline void lockdep_init_map_waits(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer) @@ -431,13 +480,28 @@ enum xhlock_context_t { XHLOCK_CTX_NR, }; +#ifdef CONFIG_DEPT +/* + * TODO: I found the case to use an address of other than a real key as + * _key, for instance, in workqueue. So for now, we cannot use the + * assignment like '.dmap.keys = &(_key)->dkey' unless it's fixed. + */ +#define STATIC_DEPT_MAP_INIT(_name, _key) .dmap = { \ + .name = (_name), \ + .keys = NULL, \ + }, +#else +#define STATIC_DEPT_MAP_INIT(_name, _key) +#endif + #define lockdep_init_map_crosslock(m, n, k, s) do {} while (0) /* * To initialize a lockdep_map statically use this macro. * Note that _name must not be NULL. */ #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ - { .name = (_name), .key = (void *)(_key), } + { .name = (_name), .key = (void *)(_key), \ + STATIC_DEPT_MAP_INIT(_name, _key) } static inline void lockdep_invariant_state(bool force) {} static inline void lockdep_free_task(struct task_struct *task) {} diff --git a/include/linux/lockdep_types.h b/include/linux/lockdep_types.h index d224308..50c8879 100644 --- a/include/linux/lockdep_types.h +++ b/include/linux/lockdep_types.h @@ -11,6 +11,7 @@ #define __LINUX_LOCKDEP_TYPES_H #include <linux/types.h> +#include <linux/dept.h> #define MAX_LOCKDEP_SUBCLASSES 8UL @@ -76,6 +77,7 @@ struct lock_class_key { struct hlist_node hash_entry; struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; }; + struct dept_key dkey; }; extern struct lock_class_key __lockdep_no_validate__; @@ -185,6 +187,7 @@ struct lockdep_map { int cpu; unsigned long ip; #endif + struct dept_map dmap; }; struct pin_cookie { unsigned int val; }; diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index f8a0212..e324d61 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -1184,7 +1184,7 @@ static inline struct hlist_head *keyhashentry(const struct lock_class_key *key) } /* Register a dynamically allocated key. */ -void lockdep_register_key(struct lock_class_key *key) +void __lockdep_register_key(struct lock_class_key *key) { struct hlist_head *hash_head; struct lock_class_key *k; @@ -1207,7 +1207,7 @@ void lockdep_register_key(struct lock_class_key *key) restore_irqs: raw_local_irq_restore(flags); } -EXPORT_SYMBOL_GPL(lockdep_register_key); +EXPORT_SYMBOL_GPL(__lockdep_register_key); /* Check whether a key has been registered as a dynamic key. */ static bool is_dynamic_key(const struct lock_class_key *key) @@ -4771,7 +4771,7 @@ static inline int check_wait_context(struct task_struct *curr, /* * Initialize a lock instance's lock-class mapping info: */ -void lockdep_init_map_type(struct lockdep_map *lock, const char *name, +void __lockdep_init_map_type(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type) { @@ -4831,7 +4831,7 @@ void lockdep_init_map_type(struct lockdep_map *lock, const char *name, raw_local_irq_restore(flags); } } -EXPORT_SYMBOL_GPL(lockdep_init_map_type); +EXPORT_SYMBOL_GPL(__lockdep_init_map_type); struct lock_class_key __lockdep_no_validate__; EXPORT_SYMBOL_GPL(__lockdep_no_validate__); @@ -6291,7 +6291,7 @@ void lockdep_reset_lock(struct lockdep_map *lock) } /* Unregister a dynamically allocated key. */ -void lockdep_unregister_key(struct lock_class_key *key) +void __lockdep_unregister_key(struct lock_class_key *key) { struct hlist_head *hash_head = keyhashentry(key); struct lock_class_key *k; @@ -6326,7 +6326,7 @@ void lockdep_unregister_key(struct lock_class_key *key) /* Wait until is_dynamic_key() has finished accessing k->hash_entry. */ synchronize_rcu(); } -EXPORT_SYMBOL_GPL(lockdep_unregister_key); +EXPORT_SYMBOL_GPL(__lockdep_unregister_key); void __init lockdep_init(void) { -- 1.9.1
next prev parent reply other threads:[~2022-03-16 2:27 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-03-16 2:26 [PATCH RFC v5 00/21] DEPT(Dependency Tracker) Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 01/21] llist: Move llist_{head,node} definition to types.h Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 01/21] llist: Move llist_{head, node} " Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 02/21] dept: Implement Dept(Dependency Tracker) Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` Byungchul Park [this message] 2022-03-16 2:26 ` [PATCH RFC v5 03/21] dept: Embed Dept data in Lockdep Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 04/21] dept: Apply Dept to spinlock Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 05/21] dept: Apply Dept to mutex families Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 06/21] dept: Apply Dept to rwlock Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 07/21] dept: Apply Dept to wait_for_completion()/complete() Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 08/21] dept: Apply Dept to seqlock Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 09/21] dept: Apply Dept to rwsem Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 10/21] dept: Add proc knobs to show stats and dependency graph Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 11/21] dept: Introduce split map concept and new APIs for them Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 12/21] dept: Apply Dept to wait/event of PG_{locked,writeback} Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 12/21] dept: Apply Dept to wait/event of PG_{locked, writeback} Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 13/21] dept: Apply SDT to swait Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 14/21] dept: Apply SDT to wait(waitqueue) Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 15/21] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 16/21] dept: Distinguish each syscall context from another Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 17/21] dept: Distinguish each work " Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 18/21] dept: Disable Dept within the wait_bit layer by default Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 19/21] dept: Add nocheck version of init_completion() Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 20/21] dept: Disable Dept on struct crypto_larval's completion for now Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-16 2:26 ` [PATCH RFC v5 21/21] dept: Don't create dependencies between different depths in any case Byungchul Park 2022-03-16 2:26 ` Byungchul Park 2022-03-17 3:39 ` [PATCH RFC v5 00/21] DEPT(Dependency Tracker) Theodore Ts'o 2022-03-17 3:39 ` Theodore Ts'o 2022-03-18 7:49 ` Byungchul Park 2022-03-18 7:49 ` Byungchul Park 2022-03-19 22:49 ` Theodore Ts'o 2022-03-19 22:49 ` Theodore Ts'o 2022-03-20 10:55 ` Byungchul Park 2022-03-20 10:55 ` Byungchul Park
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