forked from Minki/linux
perf lock: Introduce new tool "perf lock", for analyzing lock statistics
Adding new subcommand "perf lock" to perf. I have a lot of remaining ToDos, but for now perf lock can already provide minimal functionality for analyzing lock statistics. Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1264851813-8413-12-git-send-email-mitake@dcl.info.waseda.ac.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hitoshi Mitake
Ingo Molnar
parent
c965be10ca
commit
9b5e350c7a
@ -456,6 +456,7 @@ BUILTIN_OBJS += builtin-top.o
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BUILTIN_OBJS += builtin-trace.o
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BUILTIN_OBJS += builtin-probe.o
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BUILTIN_OBJS += builtin-kmem.o
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BUILTIN_OBJS += builtin-lock.o
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PERFLIBS = $(LIB_FILE)
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724
tools/perf/builtin-lock.c
Normal file
724
tools/perf/builtin-lock.c
Normal file
@ -0,0 +1,724 @@
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#include "builtin.h"
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#include "perf.h"
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#include "util/util.h"
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#include "util/cache.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/header.h"
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#include "util/parse-options.h"
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#include "util/trace-event.h"
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#include "util/debug.h"
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#include "util/session.h"
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#include <sys/types.h>
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#include <sys/prctl.h>
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#include <semaphore.h>
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#include <pthread.h>
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#include <math.h>
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#include <limits.h>
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#include <linux/list.h>
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#include <linux/hash.h>
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/* based on kernel/lockdep.c */
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#define LOCKHASH_BITS 12
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#define LOCKHASH_SIZE (1UL << LOCKHASH_BITS)
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static struct list_head lockhash_table[LOCKHASH_SIZE];
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#define __lockhashfn(key) hash_long((unsigned long)key, LOCKHASH_BITS)
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#define lockhashentry(key) (lockhash_table + __lockhashfn((key)))
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#define LOCK_STATE_UNLOCKED 0 /* initial state */
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#define LOCK_STATE_LOCKED 1
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struct lock_stat {
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struct list_head hash_entry;
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struct rb_node rb; /* used for sorting */
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/* FIXME: raw_field_value() returns unsigned long long,
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* so address of lockdep_map should be dealed as 64bit.
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* Is there more better solution? */
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void *addr; /* address of lockdep_map, used as ID */
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char *name; /* for strcpy(), we cannot use const */
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char *file;
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unsigned int line;
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int state;
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u64 prev_event_time; /* timestamp of previous event */
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unsigned int nr_acquired;
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unsigned int nr_acquire;
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unsigned int nr_contended;
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unsigned int nr_release;
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/* these times are in nano sec. */
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u64 wait_time_total;
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u64 wait_time_min;
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u64 wait_time_max;
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};
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/* build simple key function one is bigger than two */
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#define SINGLE_KEY(member) \
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static int lock_stat_key_ ## member(struct lock_stat *one, \
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struct lock_stat *two) \
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{ \
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return one->member > two->member; \
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}
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SINGLE_KEY(nr_acquired)
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SINGLE_KEY(nr_contended)
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SINGLE_KEY(wait_time_total)
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SINGLE_KEY(wait_time_min)
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SINGLE_KEY(wait_time_max)
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struct lock_key {
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/*
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* name: the value for specify by user
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* this should be simpler than raw name of member
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* e.g. nr_acquired -> acquired, wait_time_total -> wait_total
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*/
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const char *name;
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int (*key)(struct lock_stat*, struct lock_stat*);
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};
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static const char *sort_key = "acquired";
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static int (*compare)(struct lock_stat *, struct lock_stat *);
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#define DEF_KEY_LOCK(name, fn_suffix) \
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{ #name, lock_stat_key_ ## fn_suffix }
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struct lock_key keys[] = {
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DEF_KEY_LOCK(acquired, nr_acquired),
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DEF_KEY_LOCK(contended, nr_contended),
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DEF_KEY_LOCK(wait_total, wait_time_total),
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DEF_KEY_LOCK(wait_min, wait_time_min),
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DEF_KEY_LOCK(wait_max, wait_time_max),
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/* extra comparisons much complicated should be here */
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{ NULL, NULL }
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};
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static void select_key(void)
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{
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int i;
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for (i = 0; keys[i].name; i++) {
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if (!strcmp(keys[i].name, sort_key)) {
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compare = keys[i].key;
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return;
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}
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}
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die("Unknown compare key:%s\n", sort_key);
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}
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static struct rb_root result; /* place to store sorted data */
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static void insert_to_result(struct lock_stat *st,
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int (*bigger)(struct lock_stat *,
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struct lock_stat *))
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{
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struct rb_node **rb = &result.rb_node;
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struct rb_node *parent = NULL;
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struct lock_stat *p;
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while (*rb) {
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p = container_of(*rb, struct lock_stat, rb);
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parent = *rb;
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if (bigger(st, p))
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rb = &(*rb)->rb_left;
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else
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rb = &(*rb)->rb_right;
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}
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rb_link_node(&st->rb, parent, rb);
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rb_insert_color(&st->rb, &result);
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}
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/* returns left most element of result, and erase it */
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static struct lock_stat *pop_from_result(void)
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{
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struct rb_node *node = result.rb_node;
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if (!node)
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return NULL;
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while (node->rb_left)
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node = node->rb_left;
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rb_erase(node, &result);
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return container_of(node, struct lock_stat, rb);
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}
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static struct lock_stat *lock_stat_findnew(void *addr, const char *name,
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const char *file, unsigned int line)
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{
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struct list_head *entry = lockhashentry(addr);
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struct lock_stat *ret, *new;
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list_for_each_entry(ret, entry, hash_entry) {
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if (ret->addr == addr)
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return ret;
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}
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new = zalloc(sizeof(struct lock_stat));
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if (!new)
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goto alloc_failed;
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new->addr = addr;
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new->name = zalloc(sizeof(char) * strlen(name) + 1);
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if (!new->name)
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goto alloc_failed;
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strcpy(new->name, name);
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new->file = zalloc(sizeof(char) * strlen(file) + 1);
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if (!new->file)
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goto alloc_failed;
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strcpy(new->file, file);
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new->line = line;
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/* LOCK_STATE_UNLOCKED == 0 isn't guaranteed forever */
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new->state = LOCK_STATE_UNLOCKED;
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new->wait_time_min = ULLONG_MAX;
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list_add(&new->hash_entry, entry);
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return new;
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alloc_failed:
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die("memory allocation failed\n");
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}
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static char const *input_name = "perf.data";
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static int profile_cpu = -1;
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struct raw_event_sample {
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u32 size;
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char data[0];
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};
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struct trace_acquire_event {
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void *addr;
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const char *name;
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const char *file;
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unsigned int line;
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};
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struct trace_acquired_event {
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void *addr;
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const char *name;
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const char *file;
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unsigned int line;
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};
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struct trace_contended_event {
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void *addr;
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const char *name;
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const char *file;
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unsigned int line;
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};
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struct trace_release_event {
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void *addr;
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const char *name;
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const char *file;
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unsigned int line;
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};
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struct trace_lock_handler {
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void (*acquire_event)(struct trace_acquire_event *,
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struct event *,
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int cpu,
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u64 timestamp,
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struct thread *thread);
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void (*acquired_event)(struct trace_acquired_event *,
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struct event *,
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int cpu,
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u64 timestamp,
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struct thread *thread);
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void (*contended_event)(struct trace_contended_event *,
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struct event *,
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int cpu,
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u64 timestamp,
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struct thread *thread);
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void (*release_event)(struct trace_release_event *,
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struct event *,
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int cpu,
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u64 timestamp,
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struct thread *thread);
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};
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static void prof_lock_acquire_event(struct trace_acquire_event *acquire_event,
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struct event *__event __used,
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int cpu __used,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct lock_stat *st;
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st = lock_stat_findnew(acquire_event->addr, acquire_event->name,
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acquire_event->file, acquire_event->line);
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switch (st->state) {
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case LOCK_STATE_UNLOCKED:
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break;
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case LOCK_STATE_LOCKED:
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break;
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default:
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BUG_ON(1);
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break;
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}
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st->prev_event_time = timestamp;
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}
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static void prof_lock_acquired_event(struct trace_acquired_event *acquired_event,
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struct event *__event __used,
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int cpu __used,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct lock_stat *st;
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st = lock_stat_findnew(acquired_event->addr, acquired_event->name,
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acquired_event->file, acquired_event->line);
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switch (st->state) {
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case LOCK_STATE_UNLOCKED:
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st->state = LOCK_STATE_LOCKED;
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st->nr_acquired++;
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break;
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case LOCK_STATE_LOCKED:
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break;
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default:
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BUG_ON(1);
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break;
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}
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st->prev_event_time = timestamp;
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}
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static void prof_lock_contended_event(struct trace_contended_event *contended_event,
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struct event *__event __used,
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int cpu __used,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct lock_stat *st;
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st = lock_stat_findnew(contended_event->addr, contended_event->name,
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contended_event->file, contended_event->line);
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switch (st->state) {
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case LOCK_STATE_UNLOCKED:
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break;
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case LOCK_STATE_LOCKED:
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st->nr_contended++;
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break;
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default:
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BUG_ON(1);
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break;
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}
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st->prev_event_time = timestamp;
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}
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static void prof_lock_release_event(struct trace_release_event *release_event,
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struct event *__event __used,
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int cpu __used,
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u64 timestamp,
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struct thread *thread __used)
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{
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struct lock_stat *st;
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u64 hold_time;
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st = lock_stat_findnew(release_event->addr, release_event->name,
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release_event->file, release_event->line);
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switch (st->state) {
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case LOCK_STATE_UNLOCKED:
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break;
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case LOCK_STATE_LOCKED:
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st->state = LOCK_STATE_UNLOCKED;
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hold_time = timestamp - st->prev_event_time;
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if (timestamp < st->prev_event_time) {
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/* terribly, this can happen... */
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goto end;
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}
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if (st->wait_time_min > hold_time)
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st->wait_time_min = hold_time;
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if (st->wait_time_max < hold_time)
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st->wait_time_max = hold_time;
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st->wait_time_total += hold_time;
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st->nr_release++;
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break;
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default:
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BUG_ON(1);
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break;
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}
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end:
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st->prev_event_time = timestamp;
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}
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/* lock oriented handlers */
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/* TODO: handlers for CPU oriented, thread oriented */
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static struct trace_lock_handler prof_lock_ops = {
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.acquire_event = prof_lock_acquire_event,
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.acquired_event = prof_lock_acquired_event,
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.contended_event = prof_lock_contended_event,
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.release_event = prof_lock_release_event,
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};
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static struct trace_lock_handler *trace_handler;
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static void
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process_lock_acquire_event(void *data,
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struct event *event __used,
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int cpu __used,
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u64 timestamp __used,
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struct thread *thread __used)
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{
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struct trace_acquire_event acquire_event;
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u64 tmp; /* this is required for casting... */
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tmp = raw_field_value(event, "lockdep_addr", data);
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memcpy(&acquire_event.addr, &tmp, sizeof(void *));
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acquire_event.name = (char *)raw_field_ptr(event, "name", data);
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acquire_event.file = (char *)raw_field_ptr(event, "file", data);
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acquire_event.line =
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(unsigned int)raw_field_value(event, "line", data);
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if (trace_handler->acquire_event) {
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trace_handler->acquire_event(&acquire_event,
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event, cpu, timestamp, thread);
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}
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}
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static void
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process_lock_acquired_event(void *data,
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struct event *event __used,
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int cpu __used,
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u64 timestamp __used,
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struct thread *thread __used)
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{
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struct trace_acquired_event acquired_event;
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u64 tmp; /* this is required for casting... */
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tmp = raw_field_value(event, "lockdep_addr", data);
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memcpy(&acquired_event.addr, &tmp, sizeof(void *));
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acquired_event.name = (char *)raw_field_ptr(event, "name", data);
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acquired_event.file = (char *)raw_field_ptr(event, "file", data);
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acquired_event.line =
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(unsigned int)raw_field_value(event, "line", data);
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if (trace_handler->acquire_event) {
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trace_handler->acquired_event(&acquired_event,
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event, cpu, timestamp, thread);
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}
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}
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static void
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process_lock_contended_event(void *data,
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struct event *event __used,
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int cpu __used,
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u64 timestamp __used,
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struct thread *thread __used)
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{
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struct trace_contended_event contended_event;
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u64 tmp; /* this is required for casting... */
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tmp = raw_field_value(event, "lockdep_addr", data);
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memcpy(&contended_event.addr, &tmp, sizeof(void *));
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contended_event.name = (char *)raw_field_ptr(event, "name", data);
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contended_event.file = (char *)raw_field_ptr(event, "file", data);
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contended_event.line =
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(unsigned int)raw_field_value(event, "line", data);
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if (trace_handler->acquire_event) {
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trace_handler->contended_event(&contended_event,
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event, cpu, timestamp, thread);
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}
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}
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static void
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process_lock_release_event(void *data,
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struct event *event __used,
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int cpu __used,
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u64 timestamp __used,
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struct thread *thread __used)
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{
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struct trace_release_event release_event;
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u64 tmp; /* this is required for casting... */
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tmp = raw_field_value(event, "lockdep_addr", data);
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memcpy(&release_event.addr, &tmp, sizeof(void *));
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release_event.name = (char *)raw_field_ptr(event, "name", data);
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release_event.file = (char *)raw_field_ptr(event, "file", data);
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release_event.line =
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(unsigned int)raw_field_value(event, "line", data);
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if (trace_handler->acquire_event) {
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trace_handler->release_event(&release_event,
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event, cpu, timestamp, thread);
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}
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}
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static void
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process_raw_event(void *data, int cpu,
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u64 timestamp, struct thread *thread)
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{
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struct event *event;
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int type;
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type = trace_parse_common_type(data);
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event = trace_find_event(type);
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if (!strcmp(event->name, "lock_acquire"))
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process_lock_acquire_event(data, event, cpu, timestamp, thread);
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if (!strcmp(event->name, "lock_acquired"))
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process_lock_acquired_event(data, event, cpu, timestamp, thread);
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if (!strcmp(event->name, "lock_contended"))
|
||||
process_lock_contended_event(data, event, cpu, timestamp, thread);
|
||||
if (!strcmp(event->name, "lock_release"))
|
||||
process_lock_release_event(data, event, cpu, timestamp, thread);
|
||||
}
|
||||
|
||||
static int process_sample_event(event_t *event, struct perf_session *session)
|
||||
{
|
||||
struct thread *thread;
|
||||
struct sample_data data;
|
||||
|
||||
bzero(&data, sizeof(struct sample_data));
|
||||
event__parse_sample(event, session->sample_type, &data);
|
||||
thread = perf_session__findnew(session, data.pid);
|
||||
|
||||
/*
|
||||
* FIXME: this causes warn on 32bit environment
|
||||
* because of (void *)data.ip (type of data.ip is u64)
|
||||
*/
|
||||
/* dump_printf("(IP, %d): %d/%d: %p period: %llu\n", */
|
||||
/* event->header.misc, */
|
||||
/* data.pid, data.tid, (void *)data.ip, data.period); */
|
||||
|
||||
if (thread == NULL) {
|
||||
pr_debug("problem processing %d event, skipping it.\n",
|
||||
event->header.type);
|
||||
return -1;
|
||||
}
|
||||
|
||||
dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
|
||||
|
||||
if (profile_cpu != -1 && profile_cpu != (int) data.cpu)
|
||||
return 0;
|
||||
|
||||
process_raw_event(data.raw_data, data.cpu, data.time, thread);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* TODO: various way to print, coloring, nano or milli sec */
|
||||
static void print_result(void)
|
||||
{
|
||||
struct lock_stat *st;
|
||||
char cut_name[20];
|
||||
|
||||
printf("%18s ", "ID");
|
||||
printf("%20s ", "Name");
|
||||
printf("%10s ", "acquired");
|
||||
printf("%10s ", "contended");
|
||||
|
||||
printf("%15s ", "total wait (ns)");
|
||||
printf("%15s ", "max wait (ns)");
|
||||
printf("%15s ", "min wait (ns)");
|
||||
|
||||
printf("\n\n");
|
||||
|
||||
while ((st = pop_from_result())) {
|
||||
bzero(cut_name, 20);
|
||||
|
||||
printf("%p ", st->addr);
|
||||
|
||||
if (strlen(st->name) < 16) {
|
||||
/* output raw name */
|
||||
printf("%20s ", st->name);
|
||||
} else {
|
||||
strncpy(cut_name, st->name, 16);
|
||||
cut_name[16] = '.';
|
||||
cut_name[17] = '.';
|
||||
cut_name[18] = '.';
|
||||
cut_name[19] = '\0';
|
||||
/* cut off name for saving output style */
|
||||
printf("%20s ", cut_name);
|
||||
}
|
||||
|
||||
printf("%10u ", st->nr_acquired);
|
||||
printf("%10u ", st->nr_contended);
|
||||
|
||||
printf("%15llu ", st->wait_time_total);
|
||||
printf("%15llu ", st->wait_time_max);
|
||||
printf("%15llu ", st->wait_time_min == ULLONG_MAX ?
|
||||
0 : st->wait_time_min);
|
||||
printf("\n");
|
||||
}
|
||||
}
|
||||
|
||||
static void dump_map(void)
|
||||
{
|
||||
unsigned int i;
|
||||
struct lock_stat *st;
|
||||
|
||||
for (i = 0; i < LOCKHASH_SIZE; i++) {
|
||||
list_for_each_entry(st, &lockhash_table[i], hash_entry) {
|
||||
printf("%p: %s (src: %s, line: %u)\n",
|
||||
st->addr, st->name, st->file, st->line);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static struct perf_event_ops eops = {
|
||||
.sample = process_sample_event,
|
||||
.comm = event__process_comm,
|
||||
};
|
||||
|
||||
static struct perf_session *session;
|
||||
|
||||
static int read_events(void)
|
||||
{
|
||||
session = perf_session__new(input_name, O_RDONLY, 0);
|
||||
if (!session)
|
||||
die("Initializing perf session failed\n");
|
||||
|
||||
return perf_session__process_events(session, &eops);
|
||||
}
|
||||
|
||||
static void sort_result(void)
|
||||
{
|
||||
unsigned int i;
|
||||
struct lock_stat *st;
|
||||
|
||||
for (i = 0; i < LOCKHASH_SIZE; i++) {
|
||||
list_for_each_entry(st, &lockhash_table[i], hash_entry) {
|
||||
insert_to_result(st, compare);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void __cmd_prof(void)
|
||||
{
|
||||
setup_pager();
|
||||
select_key();
|
||||
read_events();
|
||||
sort_result();
|
||||
print_result();
|
||||
}
|
||||
|
||||
static const char * const prof_usage[] = {
|
||||
"perf sched prof [<options>]",
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct option prof_options[] = {
|
||||
OPT_STRING('k', "key", &sort_key, "acquired",
|
||||
"key for sorting"),
|
||||
/* TODO: type */
|
||||
OPT_END()
|
||||
};
|
||||
|
||||
static const char * const lock_usage[] = {
|
||||
"perf lock [<options>] {record|trace|prof}",
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct option lock_options[] = {
|
||||
OPT_STRING('i', "input", &input_name, "file",
|
||||
"input file name"),
|
||||
OPT_BOOLEAN('v', "verbose", &verbose,
|
||||
"be more verbose (show symbol address, etc)"),
|
||||
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
|
||||
"dump raw trace in ASCII"),
|
||||
OPT_END()
|
||||
};
|
||||
|
||||
static const char *record_args[] = {
|
||||
"record",
|
||||
"-a",
|
||||
"-R",
|
||||
"-M",
|
||||
"-f",
|
||||
"-m", "1024",
|
||||
"-c", "1",
|
||||
"-e", "lock:lock_acquire:r",
|
||||
"-e", "lock:lock_acquired:r",
|
||||
"-e", "lock:lock_contended:r",
|
||||
"-e", "lock:lock_release:r",
|
||||
};
|
||||
|
||||
static int __cmd_record(int argc, const char **argv)
|
||||
{
|
||||
unsigned int rec_argc, i, j;
|
||||
const char **rec_argv;
|
||||
|
||||
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
|
||||
rec_argv = calloc(rec_argc + 1, sizeof(char *));
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(record_args); i++)
|
||||
rec_argv[i] = strdup(record_args[i]);
|
||||
|
||||
for (j = 1; j < (unsigned int)argc; j++, i++)
|
||||
rec_argv[i] = argv[j];
|
||||
|
||||
BUG_ON(i != rec_argc);
|
||||
|
||||
return cmd_record(i, rec_argv, NULL);
|
||||
}
|
||||
|
||||
int cmd_lock(int argc, const char **argv, const char *prefix __used)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
symbol__init();
|
||||
for (i = 0; i < LOCKHASH_SIZE; i++)
|
||||
INIT_LIST_HEAD(lockhash_table + i);
|
||||
|
||||
argc = parse_options(argc, argv, lock_options, lock_usage,
|
||||
PARSE_OPT_STOP_AT_NON_OPTION);
|
||||
if (!argc)
|
||||
usage_with_options(lock_usage, lock_options);
|
||||
|
||||
if (!strncmp(argv[0], "rec", 3)) {
|
||||
return __cmd_record(argc, argv);
|
||||
} else if (!strncmp(argv[0], "prof", 4)) {
|
||||
trace_handler = &prof_lock_ops;
|
||||
if (argc) {
|
||||
argc = parse_options(argc, argv,
|
||||
prof_options, prof_usage, 0);
|
||||
if (argc)
|
||||
usage_with_options(prof_usage, prof_options);
|
||||
}
|
||||
__cmd_prof();
|
||||
} else if (!strcmp(argv[0], "trace")) {
|
||||
/* Aliased to 'perf trace' */
|
||||
return cmd_trace(argc, argv, prefix);
|
||||
} else if (!strcmp(argv[0], "map")) {
|
||||
/* recycling prof_lock_ops */
|
||||
trace_handler = &prof_lock_ops;
|
||||
setup_pager();
|
||||
read_events();
|
||||
dump_map();
|
||||
} else {
|
||||
usage_with_options(lock_usage, lock_options);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -31,5 +31,6 @@ extern int cmd_trace(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_version(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_probe(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_kmem(int argc, const char **argv, const char *prefix);
|
||||
extern int cmd_lock(int argc, const char **argv, const char *prefix);
|
||||
|
||||
#endif
|
||||
|
||||
@ -303,6 +303,7 @@ static void handle_internal_command(int argc, const char **argv)
|
||||
{ "sched", cmd_sched, 0 },
|
||||
{ "probe", cmd_probe, 0 },
|
||||
{ "kmem", cmd_kmem, 0 },
|
||||
{ "lock", cmd_lock, 0 },
|
||||
};
|
||||
unsigned int i;
|
||||
static const char ext[] = STRIP_EXTENSION;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user