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Diffstat (limited to 'tools/perf/util/lock-contention.h')
| -rw-r--r-- | tools/perf/util/lock-contention.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/tools/perf/util/lock-contention.h b/tools/perf/util/lock-contention.h new file mode 100644 index 0000000000..fa16532c97 --- /dev/null +++ b/tools/perf/util/lock-contention.h @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef PERF_LOCK_CONTENTION_H +#define PERF_LOCK_CONTENTION_H + +#include <linux/list.h> +#include <linux/rbtree.h> + +struct lock_filter { + int nr_types; + int nr_addrs; + int nr_syms; + unsigned int *types; + unsigned long *addrs; + char **syms; +}; + +struct lock_stat { + struct hlist_node hash_entry; + struct rb_node rb; /* used for sorting */ + + u64 addr; /* address of lockdep_map, used as ID */ + char *name; /* for strcpy(), we cannot use const */ + u64 *callstack; + + unsigned int nr_acquire; + unsigned int nr_acquired; + unsigned int nr_contended; + unsigned int nr_release; + + union { + unsigned int nr_readlock; + unsigned int flags; + }; + unsigned int nr_trylock; + + /* these times are in nano sec. */ + u64 avg_wait_time; + u64 wait_time_total; + u64 wait_time_min; + u64 wait_time_max; + + int broken; /* flag of blacklist */ + int combined; +}; + +/* + * States of lock_seq_stat + * + * UNINITIALIZED is required for detecting first event of acquire. + * As the nature of lock events, there is no guarantee + * that the first event for the locks are acquire, + * it can be acquired, contended or release. + */ +#define SEQ_STATE_UNINITIALIZED 0 /* initial state */ +#define SEQ_STATE_RELEASED 1 +#define SEQ_STATE_ACQUIRING 2 +#define SEQ_STATE_ACQUIRED 3 +#define SEQ_STATE_READ_ACQUIRED 4 +#define SEQ_STATE_CONTENDED 5 + +/* + * MAX_LOCK_DEPTH + * Imported from include/linux/sched.h. + * Should this be synchronized? + */ +#define MAX_LOCK_DEPTH 48 + +struct lock_stat *lock_stat_find(u64 addr); +struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags); + +bool match_callstack_filter(struct machine *machine, u64 *callstack); + +/* + * struct lock_seq_stat: + * Place to put on state of one lock sequence + * 1) acquire -> acquired -> release + * 2) acquire -> contended -> acquired -> release + * 3) acquire (with read or try) -> release + * 4) Are there other patterns? + */ +struct lock_seq_stat { + struct list_head list; + int state; + u64 prev_event_time; + u64 addr; + + int read_count; +}; + +struct thread_stat { + struct rb_node rb; + + u32 tid; + struct list_head seq_list; +}; + +/* + * CONTENTION_STACK_DEPTH + * Number of stack trace entries to find callers + */ +#define CONTENTION_STACK_DEPTH 8 + +/* + * CONTENTION_STACK_SKIP + * Number of stack trace entries to skip when finding callers. + * The first few entries belong to the locking implementation itself. + */ +#define CONTENTION_STACK_SKIP 4 + +/* + * flags for lock:contention_begin + * Imported from include/trace/events/lock.h. + */ +#define LCB_F_SPIN (1U << 0) +#define LCB_F_READ (1U << 1) +#define LCB_F_WRITE (1U << 2) +#define LCB_F_RT (1U << 3) +#define LCB_F_PERCPU (1U << 4) +#define LCB_F_MUTEX (1U << 5) + +struct evlist; +struct machine; +struct target; + +struct lock_contention_fails { + int task; + int stack; + int time; + int data; +}; + +struct lock_contention { + struct evlist *evlist; + struct target *target; + struct machine *machine; + struct hlist_head *result; + struct lock_filter *filters; + struct lock_contention_fails fails; + unsigned long map_nr_entries; + int max_stack; + int stack_skip; + int aggr_mode; + int owner; + int nr_filtered; + bool save_callstack; +}; + +#ifdef HAVE_BPF_SKEL + +int lock_contention_prepare(struct lock_contention *con); +int lock_contention_start(void); +int lock_contention_stop(void); +int lock_contention_read(struct lock_contention *con); +int lock_contention_finish(void); + +#else /* !HAVE_BPF_SKEL */ + +static inline int lock_contention_prepare(struct lock_contention *con __maybe_unused) +{ + return 0; +} + +static inline int lock_contention_start(void) { return 0; } +static inline int lock_contention_stop(void) { return 0; } +static inline int lock_contention_finish(void) { return 0; } + +static inline int lock_contention_read(struct lock_contention *con __maybe_unused) +{ + return 0; +} + +#endif /* HAVE_BPF_SKEL */ + +#endif /* PERF_LOCK_CONTENTION_H */ |