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kernel/locking/lockdep_proc.c
17 KB
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// SPDX-License-Identifier: GPL-2.0 |
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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> |
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* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra |
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* * Code for /proc/lockdep and /proc/lockdep_stats: * */ |
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#include <linux/export.h> |
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#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> |
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#include <linux/uaccess.h> |
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#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) { |
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char str[KSYM_NAME_LEN]; |
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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 |
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seq_printf(m, " OPS:%8ld", debug_class_ops_read(class)); |
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#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, }; |
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#ifdef CONFIG_PROVE_LOCKING |
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static void *lc_start(struct seq_file *m, loff_t *pos) { |
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if (*pos < 0) return NULL; |
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if (*pos == 0) return SEQ_START_TOKEN; |
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return lock_chains + (*pos - 1); |
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} |
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static void *lc_next(struct seq_file *m, void *v, loff_t *pos) { |
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*pos = lockdep_next_lockchain(*pos - 1) + 1; |
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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) { |
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if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS) seq_printf(m, "(buggered) "); |
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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, }; |
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#endif /* CONFIG_PROVE_LOCKING */ |
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|
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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)); |
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seq_printf(m, " redundant checks: %11llu ", debug_atomic_read(nr_redundant_checks)); seq_printf(m, " redundant links: %11llu ", debug_atomic_read(nr_redundant)); |
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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) { |
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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, |
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sum_forward_deps = 0; |
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#ifdef CONFIG_PROVE_LOCKING |
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struct lock_class *class; |
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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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sum_forward_deps += lockdep_count_forward_deps(class); |
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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 |
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#endif |
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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); |
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#ifdef CONFIG_PROVE_LOCKING |
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seq_printf(m, " dependency chains: %11lu [max: %lu] ", |
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lock_chain_count(), 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); |
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#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING) |
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seq_printf(m, " number of stack traces: %11llu ", |
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lockdep_stack_trace_count()); |
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seq_printf(m, " number of stack hash chains: %11llu ", |
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lockdep_stack_hash_count()); #endif |
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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; } |
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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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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); |
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seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0); |
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} static void seq_stats(struct seq_file *m, struct lock_stat_data *data) { |
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const struct lockdep_subclass_key *ckey; |
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struct lock_class_stats *stats; |
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struct lock_class *class; const char *cname; |
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int i, namelen; |
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char name[39]; |
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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; |
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rcu_read_lock_sched(); cname = rcu_dereference_sched(class->name); ckey = rcu_dereference_sched(class->key); if (!cname && !ckey) { rcu_read_unlock_sched(); return; } else if (!cname) { |
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char str[KSYM_NAME_LEN]; const char *key_name; |
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key_name = __get_key_name(ckey, str); |
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snprintf(name, namelen, "%s", key_name); } else { |
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snprintf(name, namelen, "%s", cname); |
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} |
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rcu_read_unlock_sched(); |
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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 ip[32]; if (class->contention_point[i] == 0) break; if (!i) seq_line(m, '-', 40-namelen, namelen); |
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snprintf(ip, sizeof(ip), "[<%p>]", (void *)class->contention_point[i]); |
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seq_printf(m, "%40s %14lu %29s %pS ", name, stats->contention_point[i], ip, (void *)class->contention_point[i]); |
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} |
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for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c7e78cff6 lockstat: contend... |
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char ip[32]; if (class->contending_point[i] == 0) break; if (!i) seq_line(m, '-', 40-namelen, namelen); |
c7e78cff6 lockstat: contend... |
540 541 |
snprintf(ip, sizeof(ip), "[<%p>]", (void *)class->contending_point[i]); |
3cf9b85b4 locking, lockdep:... |
542 543 544 545 |
seq_printf(m, "%40s %14lu %29s %pS ", name, stats->contending_point[i], ip, (void *)class->contending_point[i]); |
c7e78cff6 lockstat: contend... |
546 |
} |
c46261de0 lockstat: human r... |
547 548 549 |
if (i) { seq_puts(m, " "); |
1232e3807 lockstat: Report ... |
550 |
seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de0 lockstat: human r... |
551 552 553 554 555 556 557 |
seq_puts(m, " "); } } static void seq_header(struct seq_file *m) { |
1232e3807 lockstat: Report ... |
558 559 |
seq_puts(m, "lock_stat version 0.4 "); |
9833f8cb9 lockstat: warn ab... |
560 561 562 563 |
if (unlikely(!debug_locks)) seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning "); |
1232e3807 lockstat: Report ... |
564 565 |
seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s " |
96645678c lockstat: measure... |
566 567 |
"%14s %14s ", |
c46261de0 lockstat: human r... |
568 |
"class name", |
96645678c lockstat: measure... |
569 |
"con-bounces", |
c46261de0 lockstat: human r... |
570 571 572 573 |
"contentions", "waittime-min", "waittime-max", "waittime-total", |
1232e3807 lockstat: Report ... |
574 |
"waittime-avg", |
96645678c lockstat: measure... |
575 |
"acq-bounces", |
c46261de0 lockstat: human r... |
576 577 578 |
"acquisitions", "holdtime-min", "holdtime-max", |
1232e3807 lockstat: Report ... |
579 580 581 |
"holdtime-total", "holdtime-avg"); seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de0 lockstat: human r... |
582 583 584 585 586 587 588 |
seq_printf(m, " "); } static void *ls_start(struct seq_file *m, loff_t *pos) { struct lock_stat_seq *data = m->private; |
96004bb2a lockdep: Simplify... |
589 |
struct lock_stat_data *iter; |
c46261de0 lockstat: human r... |
590 |
|
94c61c0ae lockdep: Avoid /p... |
591 592 |
if (*pos == 0) return SEQ_START_TOKEN; |
c46261de0 lockstat: human r... |
593 |
|
96004bb2a lockdep: Simplify... |
594 595 596 |
iter = data->stats + (*pos - 1); if (iter >= data->iter_end) iter = NULL; |
4b32d0a4e lockdep: various ... |
597 |
|
96004bb2a lockdep: Simplify... |
598 |
return iter; |
c46261de0 lockstat: human r... |
599 600 601 602 |
} static void *ls_next(struct seq_file *m, void *v, loff_t *pos) { |
c46261de0 lockstat: human r... |
603 |
(*pos)++; |
96004bb2a lockdep: Simplify... |
604 |
return ls_start(m, pos); |
c46261de0 lockstat: human r... |
605 606 607 608 609 610 611 612 |
} static void ls_stop(struct seq_file *m, void *v) { } static int ls_show(struct seq_file *m, void *v) { |
94c61c0ae lockdep: Avoid /p... |
613 614 615 616 |
if (v == SEQ_START_TOKEN) seq_header(m); else seq_stats(m, v); |
c46261de0 lockstat: human r... |
617 |
|
c46261de0 lockstat: human r... |
618 619 |
return 0; } |
88e9d34c7 seq_file: constif... |
620 |
static const struct seq_operations lockstat_ops = { |
c46261de0 lockstat: human r... |
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 |
.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... |
640 641 642 643 644 645 |
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... |
646 |
sort(data->stats, data->iter_end - data->stats, |
c46261de0 lockstat: human r... |
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 |
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... |
681 682 683 684 685 686 687 688 689 690 691 |
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: ... |
692 693 |
static int __init lockdep_proc_init(void) { |
fddda2b7b proc: introduce p... |
694 |
proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops); |
cd1a28e84 lockdep: add lock... |
695 |
#ifdef CONFIG_PROVE_LOCKING |
fddda2b7b proc: introduce p... |
696 |
proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops); |
cd1a28e84 lockdep: add lock... |
697 |
#endif |
3f3942aca proc: introduce p... |
698 |
proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show); |
c46261de0 lockstat: human r... |
699 |
#ifdef CONFIG_LOCK_STAT |
9795447f7 lockdep: Fix file... |
700 701 |
proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, &proc_lock_stat_operations); |
c46261de0 lockstat: human r... |
702 |
#endif |
a8f24a397 [PATCH] lockdep: ... |
703 704 705 706 |
return 0; } __initcall(lockdep_proc_init); |