forked from luck/tmp_suning_uos_patched
lockdep: BFS cleanup
Some cleanups of the lockdep code after the BFS series: - Remove the last traces of the generation id - Fixup comment style - Move the bfs routines into lockdep.c - Cleanup the bfs routines [ tom.leiming@gmail.com: Fix crash ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1246201486-7308-11-git-send-email-tom.leiming@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
parent
12f3dfd022
commit
af01296145
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@ -58,7 +58,6 @@ struct lock_class {
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struct lockdep_subclass_key *key;
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unsigned int subclass;
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unsigned int dep_gen_id;
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/*
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* IRQ/softirq usage tracking bits:
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@ -150,9 +149,9 @@ struct lock_list {
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struct stack_trace trace;
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int distance;
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/*The parent field is used to implement breadth-first search,and
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*the bit 0 is reused to indicate if the lock has been accessed
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*in BFS.
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/*
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* The parent field is used to implement breadth-first search, and the
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* bit 0 is reused to indicate if the lock has been accessed in BFS.
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*/
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struct lock_list *parent;
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};
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284
kernel/lockdep.c
284
kernel/lockdep.c
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@ -43,6 +43,7 @@
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#include <linux/ftrace.h>
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#include <linux/stringify.h>
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#include <linux/bitops.h>
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#include <asm/sections.h>
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#include "lockdep_internals.h"
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@ -118,7 +119,7 @@ static inline int debug_locks_off_graph_unlock(void)
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static int lockdep_initialized;
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unsigned long nr_list_entries;
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struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
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static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
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/*
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* All data structures here are protected by the global debug_lock.
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@ -390,19 +391,6 @@ unsigned int nr_process_chains;
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unsigned int max_lockdep_depth;
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unsigned int max_recursion_depth;
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static unsigned int lockdep_dependency_gen_id;
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static bool lockdep_dependency_visit(struct lock_class *source,
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unsigned int depth)
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{
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if (!depth)
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lockdep_dependency_gen_id++;
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if (source->dep_gen_id == lockdep_dependency_gen_id)
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return true;
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source->dep_gen_id = lockdep_dependency_gen_id;
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return false;
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}
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#ifdef CONFIG_DEBUG_LOCKDEP
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/*
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* We cannot printk in early bootup code. Not even early_printk()
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@ -551,88 +539,6 @@ static void lockdep_print_held_locks(struct task_struct *curr)
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}
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}
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static void print_lock_class_header(struct lock_class *class, int depth)
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{
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int bit;
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printk("%*s->", depth, "");
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print_lock_name(class);
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printk(" ops: %lu", class->ops);
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printk(" {\n");
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for (bit = 0; bit < LOCK_USAGE_STATES; bit++) {
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if (class->usage_mask & (1 << bit)) {
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int len = depth;
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len += printk("%*s %s", depth, "", usage_str[bit]);
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len += printk(" at:\n");
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print_stack_trace(class->usage_traces + bit, len);
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}
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}
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printk("%*s }\n", depth, "");
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printk("%*s ... key at: ",depth,"");
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print_ip_sym((unsigned long)class->key);
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}
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/*
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* printk the shortest lock dependencies from @start to @end in reverse order:
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*/
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static void __used
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print_shortest_lock_dependencies(struct lock_list *leaf,
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struct lock_list *root)
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{
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struct lock_list *entry = leaf;
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int depth;
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/*compute depth from generated tree by BFS*/
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depth = get_lock_depth(leaf);
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do {
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print_lock_class_header(entry->class, depth);
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printk("%*s ... acquired at:\n", depth, "");
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print_stack_trace(&entry->trace, 2);
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printk("\n");
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if (depth == 0 && (entry != root)) {
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printk("lockdep:%s bad BFS generated tree\n", __func__);
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break;
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}
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entry = get_lock_parent(entry);
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depth--;
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} while (entry && (depth >= 0));
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return;
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}
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/*
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* printk all lock dependencies starting at <entry>:
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*/
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static void __used
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print_lock_dependencies(struct lock_class *class, int depth)
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{
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struct lock_list *entry;
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if (lockdep_dependency_visit(class, depth))
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return;
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if (DEBUG_LOCKS_WARN_ON(depth >= 20))
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return;
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print_lock_class_header(class, depth);
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list_for_each_entry(entry, &class->locks_after, entry) {
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if (DEBUG_LOCKS_WARN_ON(!entry->class))
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return;
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print_lock_dependencies(entry->class, depth + 1);
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printk("%*s ... acquired at:\n",depth,"");
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print_stack_trace(&entry->trace, 2);
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printk("\n");
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}
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}
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static void print_kernel_version(void)
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{
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printk("%s %.*s\n", init_utsname()->release,
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@ -927,14 +833,106 @@ static int add_lock_to_list(struct lock_class *class, struct lock_class *this,
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return 1;
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}
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unsigned long bfs_accessed[BITS_TO_LONGS(MAX_LOCKDEP_ENTRIES)];
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static struct circular_queue lock_cq;
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/*For good efficiency of modular, we use power of 2*/
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#define MAX_CIRCULAR_QUEUE_SIZE 4096UL
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#define CQ_MASK (MAX_CIRCULAR_QUEUE_SIZE-1)
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/* The circular_queue and helpers is used to implement the
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* breadth-first search(BFS)algorithem, by which we can build
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* the shortest path from the next lock to be acquired to the
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* previous held lock if there is a circular between them.
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* */
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struct circular_queue {
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unsigned long element[MAX_CIRCULAR_QUEUE_SIZE];
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unsigned int front, rear;
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};
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static struct circular_queue lock_cq;
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static unsigned long bfs_accessed[BITS_TO_LONGS(MAX_LOCKDEP_ENTRIES)];
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unsigned int max_bfs_queue_depth;
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static inline void __cq_init(struct circular_queue *cq)
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{
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cq->front = cq->rear = 0;
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bitmap_zero(bfs_accessed, MAX_LOCKDEP_ENTRIES);
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}
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static inline int __cq_empty(struct circular_queue *cq)
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{
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return (cq->front == cq->rear);
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}
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static inline int __cq_full(struct circular_queue *cq)
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{
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return ((cq->rear + 1) & CQ_MASK) == cq->front;
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}
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static inline int __cq_enqueue(struct circular_queue *cq, unsigned long elem)
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{
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if (__cq_full(cq))
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return -1;
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cq->element[cq->rear] = elem;
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cq->rear = (cq->rear + 1) & CQ_MASK;
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return 0;
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}
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static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
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{
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if (__cq_empty(cq))
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return -1;
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*elem = cq->element[cq->front];
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cq->front = (cq->front + 1) & CQ_MASK;
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return 0;
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}
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static inline unsigned int __cq_get_elem_count(struct circular_queue *cq)
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{
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return (cq->rear - cq->front) & CQ_MASK;
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}
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static inline void mark_lock_accessed(struct lock_list *lock,
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struct lock_list *parent)
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{
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unsigned long nr;
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nr = lock - list_entries;
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WARN_ON(nr >= nr_list_entries);
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lock->parent = parent;
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set_bit(nr, bfs_accessed);
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}
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static inline unsigned long lock_accessed(struct lock_list *lock)
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{
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unsigned long nr;
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nr = lock - list_entries;
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WARN_ON(nr >= nr_list_entries);
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return test_bit(nr, bfs_accessed);
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}
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static inline struct lock_list *get_lock_parent(struct lock_list *child)
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{
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return child->parent;
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}
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static inline int get_lock_depth(struct lock_list *child)
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{
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int depth = 0;
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struct lock_list *parent;
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while ((parent = get_lock_parent(child))) {
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child = parent;
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depth++;
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}
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return depth;
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}
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static int __bfs(struct lock_list *source_entry,
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void *data,
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int (*match)(struct lock_list *entry, void *data),
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struct lock_list **target_entry,
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int forward)
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void *data,
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int (*match)(struct lock_list *entry, void *data),
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struct lock_list **target_entry,
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int forward)
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{
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struct lock_list *entry;
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struct list_head *head;
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@ -1202,14 +1200,6 @@ check_noncircular(struct lock_list *root, struct lock_class *target,
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* without creating any illegal irq-safe -> irq-unsafe lock dependency.
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*/
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#define BFS_PROCESS_RET(ret) do { \
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if (ret < 0) \
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return print_bfs_bug(ret); \
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if (ret == 1) \
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return 1; \
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} while (0)
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static inline int usage_match(struct lock_list *entry, void *bit)
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{
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return entry->class->usage_mask & (1 << (enum lock_usage_bit)bit);
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@ -1263,6 +1253,60 @@ find_usage_backwards(struct lock_list *root, enum lock_usage_bit bit,
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return result;
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}
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static void print_lock_class_header(struct lock_class *class, int depth)
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{
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int bit;
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printk("%*s->", depth, "");
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print_lock_name(class);
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printk(" ops: %lu", class->ops);
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printk(" {\n");
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for (bit = 0; bit < LOCK_USAGE_STATES; bit++) {
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if (class->usage_mask & (1 << bit)) {
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int len = depth;
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len += printk("%*s %s", depth, "", usage_str[bit]);
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len += printk(" at:\n");
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print_stack_trace(class->usage_traces + bit, len);
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}
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}
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printk("%*s }\n", depth, "");
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printk("%*s ... key at: ",depth,"");
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print_ip_sym((unsigned long)class->key);
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}
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/*
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* printk the shortest lock dependencies from @start to @end in reverse order:
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*/
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static void __used
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print_shortest_lock_dependencies(struct lock_list *leaf,
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struct lock_list *root)
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{
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struct lock_list *entry = leaf;
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int depth;
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/*compute depth from generated tree by BFS*/
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depth = get_lock_depth(leaf);
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do {
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print_lock_class_header(entry->class, depth);
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printk("%*s ... acquired at:\n", depth, "");
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print_stack_trace(&entry->trace, 2);
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printk("\n");
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if (depth == 0 && (entry != root)) {
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printk("lockdep:%s bad BFS generated tree\n", __func__);
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break;
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}
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entry = get_lock_parent(entry);
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depth--;
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} while (entry && (depth >= 0));
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return;
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}
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static int
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print_bad_irq_dependency(struct task_struct *curr,
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@ -1349,12 +1393,18 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
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this.class = hlock_class(prev);
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ret = find_usage_backwards(&this, bit_backwards, &target_entry);
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BFS_PROCESS_RET(ret);
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if (ret < 0)
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return print_bfs_bug(ret);
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if (ret == 1)
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return ret;
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that.parent = NULL;
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that.class = hlock_class(next);
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ret = find_usage_forwards(&that, bit_forwards, &target_entry1);
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BFS_PROCESS_RET(ret);
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if (ret < 0)
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return print_bfs_bug(ret);
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if (ret == 1)
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return ret;
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return print_bad_irq_dependency(curr, &this, &that,
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target_entry, target_entry1,
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@ -2038,7 +2088,10 @@ check_usage_forwards(struct task_struct *curr, struct held_lock *this,
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root.parent = NULL;
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root.class = hlock_class(this);
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ret = find_usage_forwards(&root, bit, &target_entry);
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BFS_PROCESS_RET(ret);
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if (ret < 0)
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return print_bfs_bug(ret);
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if (ret == 1)
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return ret;
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return print_irq_inversion_bug(curr, &root, target_entry,
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this, 1, irqclass);
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@ -2059,7 +2112,10 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
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root.parent = NULL;
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root.class = hlock_class(this);
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ret = find_usage_backwards(&root, bit, &target_entry);
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BFS_PROCESS_RET(ret);
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if (ret < 0)
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return print_bfs_bug(ret);
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if (ret == 1)
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return ret;
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return print_irq_inversion_bug(curr, &root, target_entry,
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this, 1, irqclass);
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@ -91,6 +91,8 @@ extern unsigned int nr_process_chains;
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extern unsigned int max_lockdep_depth;
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extern unsigned int max_recursion_depth;
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extern unsigned int max_bfs_queue_depth;
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#ifdef CONFIG_PROVE_LOCKING
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extern unsigned long lockdep_count_forward_deps(struct lock_class *);
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extern unsigned long lockdep_count_backward_deps(struct lock_class *);
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@ -136,98 +138,3 @@ extern atomic_t nr_find_usage_backwards_recursions;
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# define debug_atomic_dec(ptr) do { } while (0)
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# define debug_atomic_read(ptr) 0
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#endif
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extern unsigned int max_bfs_queue_depth;
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extern unsigned long nr_list_entries;
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extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
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extern unsigned long bfs_accessed[];
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/*For good efficiency of modular, we use power of 2*/
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#define MAX_CIRCULAR_QUE_SIZE 4096UL
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/* The circular_queue and helpers is used to implement the
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* breadth-first search(BFS)algorithem, by which we can build
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* the shortest path from the next lock to be acquired to the
|
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* previous held lock if there is a circular between them.
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* */
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struct circular_queue{
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unsigned long element[MAX_CIRCULAR_QUE_SIZE];
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unsigned int front, rear;
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};
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static inline void __cq_init(struct circular_queue *cq)
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{
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cq->front = cq->rear = 0;
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bitmap_zero(bfs_accessed, MAX_LOCKDEP_ENTRIES);
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}
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static inline int __cq_empty(struct circular_queue *cq)
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{
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return (cq->front == cq->rear);
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}
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static inline int __cq_full(struct circular_queue *cq)
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{
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return ((cq->rear + 1)&(MAX_CIRCULAR_QUE_SIZE-1)) == cq->front;
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}
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static inline int __cq_enqueue(struct circular_queue *cq, unsigned long elem)
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{
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if (__cq_full(cq))
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return -1;
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cq->element[cq->rear] = elem;
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cq->rear = (cq->rear + 1)&(MAX_CIRCULAR_QUE_SIZE-1);
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return 0;
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}
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static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
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{
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if (__cq_empty(cq))
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return -1;
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*elem = cq->element[cq->front];
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cq->front = (cq->front + 1)&(MAX_CIRCULAR_QUE_SIZE-1);
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return 0;
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}
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static inline unsigned int __cq_get_elem_count(struct circular_queue *cq)
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{
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return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1);
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}
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static inline void mark_lock_accessed(struct lock_list *lock,
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struct lock_list *parent)
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{
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unsigned long nr;
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nr = lock - list_entries;
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WARN_ON(nr >= nr_list_entries);
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lock->parent = parent;
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set_bit(nr, bfs_accessed);
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}
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static inline unsigned long lock_accessed(struct lock_list *lock)
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{
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unsigned long nr;
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nr = lock - list_entries;
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WARN_ON(nr >= nr_list_entries);
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return test_bit(nr, bfs_accessed);
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}
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static inline struct lock_list *get_lock_parent(struct lock_list *child)
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{
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return child->parent;
|
||||
}
|
||||
|
||||
static inline int get_lock_depth(struct lock_list *child)
|
||||
{
|
||||
int depth = 0;
|
||||
struct lock_list *parent;
|
||||
|
||||
while ((parent = get_lock_parent(child))) {
|
||||
child = parent;
|
||||
depth++;
|
||||
}
|
||||
return depth;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user