locking/lockdep: Rework FS_RECLAIM annotation
A while ago someone, and I cannot find the email just now, asked if we could not implement the RECLAIM_FS inversion stuff with a 'fake' lock like we use for other things like workqueues etc. I think this should be possible which allows reducing the 'irq' states and will reduce the amount of __bfs() lookups we do. Removing the 1 IRQ state results in 4 less __bfs() walks per dependency, improving lockdep performance. And by moving this annotation out of the lockdep code it becomes easier for the mm people to extend. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@kernel.org> Cc: Nikolay Borisov <nborisov@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akpm@linux-foundation.org Cc: boqun.feng@gmail.com Cc: iamjoonsoo.kim@lge.com Cc: kernel-team@lge.com Cc: kirill@shutemov.name Cc: npiggin@gmail.com Cc: walken@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>hifive-unleashed-5.1
Peter Zijlstra
Ingo Molnar
parent
a9668cd6ee
commit
d92a8cfcb3
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@ -28,6 +28,7 @@
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#include <linux/debugfs.h>
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#include <linux/sort.h>
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#include <linux/sched/mm.h>
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#include "intel_drv.h"
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static inline struct drm_i915_private *node_to_i915(struct drm_info_node *node)
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@ -4331,7 +4332,7 @@ i915_drop_caches_set(void *data, u64 val)
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mutex_unlock(&dev->struct_mutex);
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}
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lockdep_set_current_reclaim_state(GFP_KERNEL);
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fs_reclaim_acquire(GFP_KERNEL);
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if (val & DROP_BOUND)
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i915_gem_shrink(dev_priv, LONG_MAX, I915_SHRINK_BOUND);
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@ -4340,7 +4341,7 @@ i915_drop_caches_set(void *data, u64 val)
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if (val & DROP_SHRINK_ALL)
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i915_gem_shrink_all(dev_priv);
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lockdep_clear_current_reclaim_state();
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fs_reclaim_release(GFP_KERNEL);
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if (val & DROP_FREED) {
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synchronize_rcu();
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@ -29,7 +29,7 @@ extern int lock_stat;
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* We'd rather not expose kernel/lockdep_states.h this wide, but we do need
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* the total number of states... :-(
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*/
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#define XXX_LOCK_USAGE_STATES (1+3*4)
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#define XXX_LOCK_USAGE_STATES (1+2*4)
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/*
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* NR_LOCKDEP_CACHING_CLASSES ... Number of classes
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@ -363,10 +363,6 @@ static inline void lock_set_subclass(struct lockdep_map *lock,
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extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
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extern void lockdep_set_current_reclaim_state(gfp_t gfp_mask);
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extern void lockdep_clear_current_reclaim_state(void);
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extern void lockdep_trace_alloc(gfp_t mask);
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struct pin_cookie { unsigned int val; };
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#define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
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@ -375,7 +371,7 @@ extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
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extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
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extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
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# define INIT_LOCKDEP .lockdep_recursion = 0, .lockdep_reclaim_gfp = 0,
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# define INIT_LOCKDEP .lockdep_recursion = 0,
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#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
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@ -416,9 +412,6 @@ static inline void lockdep_on(void)
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# define lock_downgrade(l, i) do { } while (0)
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# define lock_set_class(l, n, k, s, i) do { } while (0)
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# define lock_set_subclass(l, s, i) do { } while (0)
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# define lockdep_set_current_reclaim_state(g) do { } while (0)
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# define lockdep_clear_current_reclaim_state() do { } while (0)
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# define lockdep_trace_alloc(g) do { } while (0)
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# define lockdep_info() do { } while (0)
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# define lockdep_init_map(lock, name, key, sub) \
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do { (void)(name); (void)(key); } while (0)
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@ -846,7 +846,6 @@ struct task_struct {
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int lockdep_depth;
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unsigned int lockdep_recursion;
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struct held_lock held_locks[MAX_LOCK_DEPTH];
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gfp_t lockdep_reclaim_gfp;
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#endif
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#ifdef CONFIG_UBSAN
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@ -167,6 +167,14 @@ static inline gfp_t current_gfp_context(gfp_t flags)
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return flags;
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}
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#ifdef CONFIG_LOCKDEP
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extern void fs_reclaim_acquire(gfp_t gfp_mask);
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extern void fs_reclaim_release(gfp_t gfp_mask);
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#else
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static inline void fs_reclaim_acquire(gfp_t gfp_mask) { }
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static inline void fs_reclaim_release(gfp_t gfp_mask) { }
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#endif
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static inline unsigned int memalloc_noio_save(void)
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{
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unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
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@ -344,14 +344,12 @@ EXPORT_SYMBOL(lockdep_on);
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#if VERBOSE
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# define HARDIRQ_VERBOSE 1
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# define SOFTIRQ_VERBOSE 1
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# define RECLAIM_VERBOSE 1
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#else
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# define HARDIRQ_VERBOSE 0
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# define SOFTIRQ_VERBOSE 0
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# define RECLAIM_VERBOSE 0
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#endif
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#if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE || RECLAIM_VERBOSE
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#if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE
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/*
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* Quick filtering for interesting events:
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*/
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@ -2567,14 +2565,6 @@ static int SOFTIRQ_verbose(struct lock_class *class)
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return 0;
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}
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static int RECLAIM_FS_verbose(struct lock_class *class)
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{
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#if RECLAIM_VERBOSE
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return class_filter(class);
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#endif
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return 0;
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}
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#define STRICT_READ_CHECKS 1
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static int (*state_verbose_f[])(struct lock_class *class) = {
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@ -2870,57 +2860,6 @@ void trace_softirqs_off(unsigned long ip)
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debug_atomic_inc(redundant_softirqs_off);
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}
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static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags)
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{
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struct task_struct *curr = current;
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if (unlikely(!debug_locks))
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return;
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gfp_mask = current_gfp_context(gfp_mask);
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/* no reclaim without waiting on it */
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if (!(gfp_mask & __GFP_DIRECT_RECLAIM))
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return;
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/* this guy won't enter reclaim */
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if ((curr->flags & PF_MEMALLOC) && !(gfp_mask & __GFP_NOMEMALLOC))
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return;
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/* We're only interested __GFP_FS allocations for now */
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if (!(gfp_mask & __GFP_FS) || (curr->flags & PF_MEMALLOC_NOFS))
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return;
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/*
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* Oi! Can't be having __GFP_FS allocations with IRQs disabled.
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*/
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if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
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return;
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/* Disable lockdep if explicitly requested */
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if (gfp_mask & __GFP_NOLOCKDEP)
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return;
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mark_held_locks(curr, RECLAIM_FS);
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}
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static void check_flags(unsigned long flags);
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void lockdep_trace_alloc(gfp_t gfp_mask)
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{
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unsigned long flags;
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if (unlikely(current->lockdep_recursion))
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return;
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raw_local_irq_save(flags);
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check_flags(flags);
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current->lockdep_recursion = 1;
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__lockdep_trace_alloc(gfp_mask, flags);
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current->lockdep_recursion = 0;
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raw_local_irq_restore(flags);
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}
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static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
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{
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/*
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@ -2966,22 +2905,6 @@ static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
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}
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}
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/*
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* We reuse the irq context infrastructure more broadly as a general
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* context checking code. This tests GFP_FS recursion (a lock taken
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* during reclaim for a GFP_FS allocation is held over a GFP_FS
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* allocation).
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*/
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if (!hlock->trylock && (curr->lockdep_reclaim_gfp & __GFP_FS)) {
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if (hlock->read) {
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if (!mark_lock(curr, hlock, LOCK_USED_IN_RECLAIM_FS_READ))
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return 0;
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} else {
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if (!mark_lock(curr, hlock, LOCK_USED_IN_RECLAIM_FS))
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return 0;
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}
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}
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return 1;
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}
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@ -3040,10 +2963,6 @@ static inline int separate_irq_context(struct task_struct *curr,
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return 0;
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}
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void lockdep_trace_alloc(gfp_t gfp_mask)
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{
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}
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#endif /* defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING) */
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/*
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@ -3952,18 +3871,6 @@ void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie cookie)
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}
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EXPORT_SYMBOL_GPL(lock_unpin_lock);
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void lockdep_set_current_reclaim_state(gfp_t gfp_mask)
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{
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current->lockdep_reclaim_gfp = current_gfp_context(gfp_mask);
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}
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EXPORT_SYMBOL_GPL(lockdep_set_current_reclaim_state);
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void lockdep_clear_current_reclaim_state(void)
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{
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current->lockdep_reclaim_gfp = 0;
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}
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EXPORT_SYMBOL_GPL(lockdep_clear_current_reclaim_state);
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#ifdef CONFIG_LOCK_STAT
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static int
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print_lock_contention_bug(struct task_struct *curr, struct lockdep_map *lock,
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@ -6,4 +6,3 @@
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*/
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LOCKDEP_STATE(HARDIRQ)
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LOCKDEP_STATE(SOFTIRQ)
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LOCKDEP_STATE(RECLAIM_FS)
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@ -66,6 +66,7 @@
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#include <linux/kthread.h>
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#include <linux/memcontrol.h>
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#include <linux/ftrace.h>
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#include <linux/lockdep.h>
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#include <asm/sections.h>
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#include <asm/tlbflush.h>
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@ -3490,6 +3491,47 @@ should_compact_retry(struct alloc_context *ac, unsigned int order, int alloc_fla
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}
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#endif /* CONFIG_COMPACTION */
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#ifdef CONFIG_LOCKDEP
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struct lockdep_map __fs_reclaim_map =
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STATIC_LOCKDEP_MAP_INIT("fs_reclaim", &__fs_reclaim_map);
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static bool __need_fs_reclaim(gfp_t gfp_mask)
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{
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gfp_mask = current_gfp_context(gfp_mask);
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/* no reclaim without waiting on it */
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if (!(gfp_mask & __GFP_DIRECT_RECLAIM))
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return false;
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/* this guy won't enter reclaim */
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if ((current->flags & PF_MEMALLOC) && !(gfp_mask & __GFP_NOMEMALLOC))
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return false;
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/* We're only interested __GFP_FS allocations for now */
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if (!(gfp_mask & __GFP_FS))
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return false;
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if (gfp_mask & __GFP_NOLOCKDEP)
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return false;
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return true;
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}
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void fs_reclaim_acquire(gfp_t gfp_mask)
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{
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if (__need_fs_reclaim(gfp_mask))
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lock_map_acquire(&__fs_reclaim_map);
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}
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EXPORT_SYMBOL_GPL(fs_reclaim_acquire);
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void fs_reclaim_release(gfp_t gfp_mask)
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{
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if (__need_fs_reclaim(gfp_mask))
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lock_map_release(&__fs_reclaim_map);
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}
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EXPORT_SYMBOL_GPL(fs_reclaim_release);
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#endif
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/* Perform direct synchronous page reclaim */
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static int
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__perform_reclaim(gfp_t gfp_mask, unsigned int order,
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@ -3504,7 +3546,7 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,
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/* We now go into synchronous reclaim */
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cpuset_memory_pressure_bump();
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noreclaim_flag = memalloc_noreclaim_save();
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lockdep_set_current_reclaim_state(gfp_mask);
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fs_reclaim_acquire(gfp_mask);
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reclaim_state.reclaimed_slab = 0;
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current->reclaim_state = &reclaim_state;
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@ -3512,7 +3554,7 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,
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ac->nodemask);
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current->reclaim_state = NULL;
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lockdep_clear_current_reclaim_state();
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fs_reclaim_release(gfp_mask);
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memalloc_noreclaim_restore(noreclaim_flag);
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cond_resched();
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@ -4041,7 +4083,8 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
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*alloc_flags |= ALLOC_CPUSET;
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}
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lockdep_trace_alloc(gfp_mask);
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fs_reclaim_acquire(gfp_mask);
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fs_reclaim_release(gfp_mask);
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might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM);
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@ -43,6 +43,7 @@ struct kmem_cache {
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#include <linux/kasan.h>
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#include <linux/kmemleak.h>
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#include <linux/random.h>
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#include <linux/sched/mm.h>
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/*
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* State of the slab allocator.
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@ -412,7 +413,10 @@ static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
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gfp_t flags)
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{
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flags &= gfp_allowed_mask;
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lockdep_trace_alloc(flags);
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fs_reclaim_acquire(flags);
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fs_reclaim_release(flags);
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might_sleep_if(gfpflags_allow_blocking(flags));
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if (should_failslab(s, flags))
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@ -432,7 +432,8 @@ __do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
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gfp &= gfp_allowed_mask;
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lockdep_trace_alloc(gfp);
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fs_reclaim_acquire(gfp);
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fs_reclaim_release(gfp);
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if (size < PAGE_SIZE - align) {
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if (!size)
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@ -538,7 +539,8 @@ static void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
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flags &= gfp_allowed_mask;
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lockdep_trace_alloc(flags);
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fs_reclaim_acquire(flags);
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fs_reclaim_release(flags);
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if (c->size < PAGE_SIZE) {
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b = slob_alloc(c->size, flags, c->align, node);
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13
mm/vmscan.c
13
mm/vmscan.c
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@ -3525,8 +3525,6 @@ static int kswapd(void *p)
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};
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const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
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lockdep_set_current_reclaim_state(GFP_KERNEL);
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if (!cpumask_empty(cpumask))
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set_cpus_allowed_ptr(tsk, cpumask);
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current->reclaim_state = &reclaim_state;
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@ -3585,14 +3583,15 @@ kswapd_try_sleep:
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*/
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trace_mm_vmscan_kswapd_wake(pgdat->node_id, classzone_idx,
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alloc_order);
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fs_reclaim_acquire(GFP_KERNEL);
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reclaim_order = balance_pgdat(pgdat, alloc_order, classzone_idx);
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fs_reclaim_release(GFP_KERNEL);
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if (reclaim_order < alloc_order)
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goto kswapd_try_sleep;
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}
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tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
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current->reclaim_state = NULL;
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lockdep_clear_current_reclaim_state();
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return 0;
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}
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@ -3655,14 +3654,14 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
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unsigned int noreclaim_flag;
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noreclaim_flag = memalloc_noreclaim_save();
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lockdep_set_current_reclaim_state(sc.gfp_mask);
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fs_reclaim_acquire(sc.gfp_mask);
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reclaim_state.reclaimed_slab = 0;
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p->reclaim_state = &reclaim_state;
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nr_reclaimed = do_try_to_free_pages(zonelist, &sc);
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p->reclaim_state = NULL;
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lockdep_clear_current_reclaim_state();
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fs_reclaim_release(sc.gfp_mask);
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memalloc_noreclaim_restore(noreclaim_flag);
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return nr_reclaimed;
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@ -3847,7 +3846,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
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*/
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noreclaim_flag = memalloc_noreclaim_save();
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p->flags |= PF_SWAPWRITE;
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lockdep_set_current_reclaim_state(sc.gfp_mask);
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fs_reclaim_acquire(sc.gfp_mask);
|
||||
reclaim_state.reclaimed_slab = 0;
|
||||
p->reclaim_state = &reclaim_state;
|
||||
|
||||
|
|
@ -3862,9 +3861,9 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
|
|||
}
|
||||
|
||||
p->reclaim_state = NULL;
|
||||
fs_reclaim_release(gfp_mask);
|
||||
current->flags &= ~PF_SWAPWRITE;
|
||||
memalloc_noreclaim_restore(noreclaim_flag);
|
||||
lockdep_clear_current_reclaim_state();
|
||||
return sc.nr_reclaimed >= nr_pages;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue