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kernel/lockdep_proc.c
17.2 KB
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/* * kernel/lockdep_proc.c * * Runtime locking correctness validator * * Started by Ingo Molnar: * |
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* Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> |
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* * Code for /proc/lockdep and /proc/lockdep_stats: * */ |
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#include <linux/module.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/kallsyms.h> #include <linux/debug_locks.h> |
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#include <linux/vmalloc.h> #include <linux/sort.h> #include <asm/uaccess.h> #include <asm/div64.h> |
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#include "lockdep_internals.h" static void *l_next(struct seq_file *m, void *v, loff_t *pos) { |
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return seq_list_next(v, &all_lock_classes, pos); |
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} static void *l_start(struct seq_file *m, loff_t *pos) { |
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return seq_list_start_head(&all_lock_classes, *pos); |
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} static void l_stop(struct seq_file *m, void *v) { } |
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static void print_name(struct seq_file *m, struct lock_class *class) { char str[128]; const char *name = class->name; if (!name) { name = __get_key_name(class->key, str); seq_printf(m, "%s", name); } else{ seq_printf(m, "%s", name); if (class->name_version > 1) seq_printf(m, "#%d", class->name_version); if (class->subclass) seq_printf(m, "/%d", class->subclass); } } |
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static int l_show(struct seq_file *m, void *v) { |
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struct lock_class *class = list_entry(v, struct lock_class, lock_entry); |
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struct lock_list *entry; |
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char usage[LOCK_USAGE_CHARS]; |
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|
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if (v == &all_lock_classes) { |
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seq_printf(m, "all lock classes: "); return 0; } |
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seq_printf(m, "%p", class->key); #ifdef CONFIG_DEBUG_LOCKDEP seq_printf(m, " OPS:%8ld", class->ops); #endif |
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#ifdef CONFIG_PROVE_LOCKING seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class)); seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class)); #endif |
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get_usage_chars(class, usage); seq_printf(m, " %s", usage); |
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seq_printf(m, ": "); print_name(m, class); seq_puts(m, " "); list_for_each_entry(entry, &class->locks_after, entry) { if (entry->distance == 1) { |
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seq_printf(m, " -> [%p] ", entry->class->key); |
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print_name(m, entry->class); seq_puts(m, " "); } |
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} seq_puts(m, " "); return 0; } |
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static const struct seq_operations lockdep_ops = { |
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.start = l_start, .next = l_next, .stop = l_stop, .show = l_show, }; static int lockdep_open(struct inode *inode, struct file *file) { |
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return seq_open(file, &lockdep_ops); |
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} |
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static const struct file_operations proc_lockdep_operations = { |
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.open = lockdep_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
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#ifdef CONFIG_PROVE_LOCKING |
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static void *lc_start(struct seq_file *m, loff_t *pos) { if (*pos == 0) return SEQ_START_TOKEN; |
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if (*pos - 1 < nr_lock_chains) return lock_chains + (*pos - 1); |
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return NULL; } |
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static void *lc_next(struct seq_file *m, void *v, loff_t *pos) { (*pos)++; return lc_start(m, pos); } |
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static void lc_stop(struct seq_file *m, void *v) { } static int lc_show(struct seq_file *m, void *v) { struct lock_chain *chain = v; struct lock_class *class; int i; if (v == SEQ_START_TOKEN) { seq_printf(m, "all lock chains: "); return 0; } seq_printf(m, "irq_context: %d ", chain->irq_context); for (i = 0; i < chain->depth; i++) { class = lock_chain_get_class(chain, i); |
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if (!class->key) continue; |
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seq_printf(m, "[%p] ", class->key); print_name(m, class); seq_puts(m, " "); } seq_puts(m, " "); return 0; } static const struct seq_operations lockdep_chains_ops = { .start = lc_start, .next = lc_next, .stop = lc_stop, .show = lc_show, }; static int lockdep_chains_open(struct inode *inode, struct file *file) { |
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return seq_open(file, &lockdep_chains_ops); |
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} static const struct file_operations proc_lockdep_chains_operations = { .open = lockdep_chains_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
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#endif /* CONFIG_PROVE_LOCKING */ |
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static void lockdep_stats_debug_show(struct seq_file *m) { #ifdef CONFIG_DEBUG_LOCKDEP |
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unsigned long long hi1 = debug_atomic_read(hardirqs_on_events), hi2 = debug_atomic_read(hardirqs_off_events), hr1 = debug_atomic_read(redundant_hardirqs_on), hr2 = debug_atomic_read(redundant_hardirqs_off), si1 = debug_atomic_read(softirqs_on_events), si2 = debug_atomic_read(softirqs_off_events), sr1 = debug_atomic_read(redundant_softirqs_on), sr2 = debug_atomic_read(redundant_softirqs_off); seq_printf(m, " chain lookup misses: %11llu ", debug_atomic_read(chain_lookup_misses)); seq_printf(m, " chain lookup hits: %11llu ", debug_atomic_read(chain_lookup_hits)); seq_printf(m, " cyclic checks: %11llu ", debug_atomic_read(nr_cyclic_checks)); seq_printf(m, " find-mask forwards checks: %11llu ", debug_atomic_read(nr_find_usage_forwards_checks)); seq_printf(m, " find-mask backwards checks: %11llu ", debug_atomic_read(nr_find_usage_backwards_checks)); seq_printf(m, " hardirq on events: %11llu ", hi1); seq_printf(m, " hardirq off events: %11llu ", hi2); seq_printf(m, " redundant hardirq ons: %11llu ", hr1); seq_printf(m, " redundant hardirq offs: %11llu ", hr2); seq_printf(m, " softirq on events: %11llu ", si1); seq_printf(m, " softirq off events: %11llu ", si2); seq_printf(m, " redundant softirq ons: %11llu ", sr1); seq_printf(m, " redundant softirq offs: %11llu ", sr2); |
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#endif } static int lockdep_stats_show(struct seq_file *m, void *v) { struct lock_class *class; unsigned long nr_unused = 0, nr_uncategorized = 0, nr_irq_safe = 0, nr_irq_unsafe = 0, nr_softirq_safe = 0, nr_softirq_unsafe = 0, nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, sum_forward_deps = 0, factor = 0; list_for_each_entry(class, &all_lock_classes, lock_entry) { if (class->usage_mask == 0) nr_unused++; if (class->usage_mask == LOCKF_USED) nr_uncategorized++; if (class->usage_mask & LOCKF_USED_IN_IRQ) nr_irq_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_IRQ) |
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nr_irq_unsafe++; if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) nr_softirq_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) |
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nr_softirq_unsafe++; if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) nr_hardirq_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) |
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nr_hardirq_unsafe++; if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) nr_irq_read_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) |
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nr_irq_read_unsafe++; if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) nr_softirq_read_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) |
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nr_softirq_read_unsafe++; if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) nr_hardirq_read_safe++; |
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if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) |
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nr_hardirq_read_unsafe++; |
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#ifdef CONFIG_PROVE_LOCKING |
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sum_forward_deps += lockdep_count_forward_deps(class); |
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#endif |
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} |
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#ifdef CONFIG_DEBUG_LOCKDEP |
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DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); |
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#endif seq_printf(m, " lock-classes: %11lu [max: %lu] ", nr_lock_classes, MAX_LOCKDEP_KEYS); seq_printf(m, " direct dependencies: %11lu [max: %lu] ", nr_list_entries, MAX_LOCKDEP_ENTRIES); seq_printf(m, " indirect dependencies: %11lu ", sum_forward_deps); /* * Total number of dependencies: * * All irq-safe locks may nest inside irq-unsafe locks, * plus all the other known dependencies: */ seq_printf(m, " all direct dependencies: %11lu ", nr_irq_unsafe * nr_irq_safe + nr_hardirq_unsafe * nr_hardirq_safe + nr_list_entries); /* * Estimated factor between direct and indirect * dependencies: */ if (nr_list_entries) factor = sum_forward_deps / nr_list_entries; |
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#ifdef CONFIG_PROVE_LOCKING |
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seq_printf(m, " dependency chains: %11lu [max: %lu] ", nr_lock_chains, MAX_LOCKDEP_CHAINS); |
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seq_printf(m, " dependency chain hlocks: %11d [max: %lu] ", |
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nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
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#endif |
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#ifdef CONFIG_TRACE_IRQFLAGS seq_printf(m, " in-hardirq chains: %11u ", nr_hardirq_chains); seq_printf(m, " in-softirq chains: %11u ", nr_softirq_chains); #endif seq_printf(m, " in-process chains: %11u ", nr_process_chains); seq_printf(m, " stack-trace entries: %11lu [max: %lu] ", nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); seq_printf(m, " combined max dependencies: %11u ", (nr_hardirq_chains + 1) * (nr_softirq_chains + 1) * (nr_process_chains + 1) ); seq_printf(m, " hardirq-safe locks: %11lu ", nr_hardirq_safe); seq_printf(m, " hardirq-unsafe locks: %11lu ", nr_hardirq_unsafe); seq_printf(m, " softirq-safe locks: %11lu ", nr_softirq_safe); seq_printf(m, " softirq-unsafe locks: %11lu ", nr_softirq_unsafe); seq_printf(m, " irq-safe locks: %11lu ", nr_irq_safe); seq_printf(m, " irq-unsafe locks: %11lu ", nr_irq_unsafe); seq_printf(m, " hardirq-read-safe locks: %11lu ", nr_hardirq_read_safe); seq_printf(m, " hardirq-read-unsafe locks: %11lu ", nr_hardirq_read_unsafe); seq_printf(m, " softirq-read-safe locks: %11lu ", nr_softirq_read_safe); seq_printf(m, " softirq-read-unsafe locks: %11lu ", nr_softirq_read_unsafe); seq_printf(m, " irq-read-safe locks: %11lu ", nr_irq_read_safe); seq_printf(m, " irq-read-unsafe locks: %11lu ", nr_irq_read_unsafe); seq_printf(m, " uncategorized locks: %11lu ", nr_uncategorized); seq_printf(m, " unused locks: %11lu ", nr_unused); seq_printf(m, " max locking depth: %11u ", max_lockdep_depth); |
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#ifdef CONFIG_PROVE_LOCKING |
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seq_printf(m, " max bfs queue depth: %11u ", max_bfs_queue_depth); |
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#endif |
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lockdep_stats_debug_show(m); seq_printf(m, " debug_locks: %11u ", debug_locks); return 0; } static int lockdep_stats_open(struct inode *inode, struct file *file) { return single_open(file, lockdep_stats_show, NULL); } |
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static const struct file_operations proc_lockdep_stats_operations = { |
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.open = lockdep_stats_open, .read = seq_read, .llseek = seq_lseek, |
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.release = single_release, |
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}; |
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#ifdef CONFIG_LOCK_STAT struct lock_stat_data { struct lock_class *class; struct lock_class_stats stats; }; struct lock_stat_seq { |
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struct lock_stat_data *iter_end; struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; }; /* * sort on absolute number of contentions */ static int lock_stat_cmp(const void *l, const void *r) { const struct lock_stat_data *dl = l, *dr = r; unsigned long nl, nr; nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; return nr - nl; } static void seq_line(struct seq_file *m, char c, int offset, int length) { int i; for (i = 0; i < offset; i++) seq_puts(m, " "); for (i = 0; i < length; i++) seq_printf(m, "%c", c); seq_puts(m, " "); } static void snprint_time(char *buf, size_t bufsiz, s64 nr) { |
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s64 div; s32 rem; |
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|
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nr += 5; /* for display rounding */ |
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div = div_s64_rem(nr, 1000, &rem); snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); |
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} static void seq_time(struct seq_file *m, s64 time) { char num[15]; snprint_time(num, sizeof(num), time); seq_printf(m, " %14s", num); } static void seq_lock_time(struct seq_file *m, struct lock_time *lt) { seq_printf(m, "%14lu", lt->nr); seq_time(m, lt->min); seq_time(m, lt->max); seq_time(m, lt->total); } static void seq_stats(struct seq_file *m, struct lock_stat_data *data) { char name[39]; struct lock_class *class; struct lock_class_stats *stats; int i, namelen; class = data->class; stats = &data->stats; |
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namelen = 38; if (class->name_version > 1) namelen -= 2; /* XXX truncates versions > 9 */ if (class->subclass) namelen -= 2; if (!class->name) { char str[KSYM_NAME_LEN]; const char *key_name; key_name = __get_key_name(class->key, str); snprintf(name, namelen, "%s", key_name); } else { snprintf(name, namelen, "%s", class->name); } |
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namelen = strlen(name); |
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if (class->name_version > 1) { snprintf(name+namelen, 3, "#%d", class->name_version); namelen += 2; } if (class->subclass) { snprintf(name+namelen, 3, "/%d", class->subclass); namelen += 2; } |
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if (stats->write_holdtime.nr) { if (stats->read_holdtime.nr) seq_printf(m, "%38s-W:", name); else seq_printf(m, "%40s:", name); |
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seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
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seq_lock_time(m, &stats->write_waittime); |
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seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
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seq_lock_time(m, &stats->write_holdtime); seq_puts(m, " "); } if (stats->read_holdtime.nr) { seq_printf(m, "%38s-R:", name); |
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seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
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seq_lock_time(m, &stats->read_waittime); |
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seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
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seq_lock_time(m, &stats->read_holdtime); seq_puts(m, " "); } if (stats->read_waittime.nr + stats->write_waittime.nr == 0) return; if (stats->read_holdtime.nr) namelen += 2; |
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for (i = 0; i < LOCKSTAT_POINTS; i++) { |
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char sym[KSYM_SYMBOL_LEN]; char ip[32]; if (class->contention_point[i] == 0) break; if (!i) seq_line(m, '-', 40-namelen, namelen); sprint_symbol(sym, class->contention_point[i]); snprintf(ip, sizeof(ip), "[<%p>]", (void *)class->contention_point[i]); seq_printf(m, "%40s %14lu %29s %s ", name, stats->contention_point[i], ip, sym); } |
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for (i = 0; i < LOCKSTAT_POINTS; i++) { char sym[KSYM_SYMBOL_LEN]; char ip[32]; if (class->contending_point[i] == 0) break; if (!i) seq_line(m, '-', 40-namelen, namelen); sprint_symbol(sym, class->contending_point[i]); snprintf(ip, sizeof(ip), "[<%p>]", (void *)class->contending_point[i]); seq_printf(m, "%40s %14lu %29s %s ", name, stats->contending_point[i], ip, sym); } |
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if (i) { seq_puts(m, " "); |
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seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); |
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seq_puts(m, " "); } } static void seq_header(struct seq_file *m) { |
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seq_printf(m, "lock_stat version 0.3 "); |
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if (unlikely(!debug_locks)) seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning "); |
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seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " "%14s %14s ", |
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"class name", |
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"con-bounces", |
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"contentions", "waittime-min", "waittime-max", "waittime-total", |
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"acq-bounces", |
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"acquisitions", "holdtime-min", "holdtime-max", "holdtime-total"); |
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seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); |
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seq_printf(m, " "); } static void *ls_start(struct seq_file *m, loff_t *pos) { struct lock_stat_seq *data = m->private; |
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struct lock_stat_data *iter; |
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|
94c61c0ae lockdep: Avoid /p... |
609 610 |
if (*pos == 0) return SEQ_START_TOKEN; |
c46261de0 lockstat: human r... |
611 |
|
96004bb2a lockdep: Simplify... |
612 613 614 |
iter = data->stats + (*pos - 1); if (iter >= data->iter_end) iter = NULL; |
4b32d0a4e lockdep: various ... |
615 |
|
96004bb2a lockdep: Simplify... |
616 |
return iter; |
c46261de0 lockstat: human r... |
617 618 619 620 |
} static void *ls_next(struct seq_file *m, void *v, loff_t *pos) { |
c46261de0 lockstat: human r... |
621 |
(*pos)++; |
96004bb2a lockdep: Simplify... |
622 |
return ls_start(m, pos); |
c46261de0 lockstat: human r... |
623 624 625 626 627 628 629 630 |
} static void ls_stop(struct seq_file *m, void *v) { } static int ls_show(struct seq_file *m, void *v) { |
94c61c0ae lockdep: Avoid /p... |
631 632 633 634 |
if (v == SEQ_START_TOKEN) seq_header(m); else seq_stats(m, v); |
c46261de0 lockstat: human r... |
635 |
|
c46261de0 lockstat: human r... |
636 637 |
return 0; } |
88e9d34c7 seq_file: constif... |
638 |
static const struct seq_operations lockstat_ops = { |
c46261de0 lockstat: human r... |
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 |
.start = ls_start, .next = ls_next, .stop = ls_stop, .show = ls_show, }; static int lock_stat_open(struct inode *inode, struct file *file) { int res; struct lock_class *class; struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); if (!data) return -ENOMEM; res = seq_open(file, &lockstat_ops); if (!res) { struct lock_stat_data *iter = data->stats; struct seq_file *m = file->private_data; |
c46261de0 lockstat: human r... |
658 659 660 661 662 663 |
list_for_each_entry(class, &all_lock_classes, lock_entry) { iter->class = class; iter->stats = lock_stats(class); iter++; } data->iter_end = iter; |
96004bb2a lockdep: Simplify... |
664 |
sort(data->stats, data->iter_end - data->stats, |
c46261de0 lockstat: human r... |
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 |
sizeof(struct lock_stat_data), lock_stat_cmp, NULL); m->private = data; } else vfree(data); return res; } static ssize_t lock_stat_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct lock_class *class; char c; if (count) { if (get_user(c, buf)) return -EFAULT; if (c != '0') return count; list_for_each_entry(class, &all_lock_classes, lock_entry) clear_lock_stats(class); } return count; } static int lock_stat_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; vfree(seq->private); |
c46261de0 lockstat: human r... |
699 700 701 702 703 704 705 706 707 708 709 |
return seq_release(inode, file); } static const struct file_operations proc_lock_stat_operations = { .open = lock_stat_open, .write = lock_stat_write, .read = seq_read, .llseek = seq_lseek, .release = lock_stat_release, }; #endif /* CONFIG_LOCK_STAT */ |
a8f24a397 [PATCH] lockdep: ... |
710 711 |
static int __init lockdep_proc_init(void) { |
c33fff0af kernel: use non-r... |
712 |
proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); |
cd1a28e84 lockdep: add lock... |
713 |
#ifdef CONFIG_PROVE_LOCKING |
443cd507c lockdep: add lock... |
714 715 |
proc_create("lockdep_chains", S_IRUSR, NULL, &proc_lockdep_chains_operations); |
cd1a28e84 lockdep: add lock... |
716 |
#endif |
c33fff0af kernel: use non-r... |
717 718 |
proc_create("lockdep_stats", S_IRUSR, NULL, &proc_lockdep_stats_operations); |
a8f24a397 [PATCH] lockdep: ... |
719 |
|
c46261de0 lockstat: human r... |
720 |
#ifdef CONFIG_LOCK_STAT |
9795447f7 lockdep: Fix file... |
721 722 |
proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, &proc_lock_stat_operations); |
c46261de0 lockstat: human r... |
723 |
#endif |
a8f24a397 [PATCH] lockdep: ... |
724 725 726 727 |
return 0; } __initcall(lockdep_proc_init); |