diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 486 |
1 files changed, 270 insertions, 216 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index c8a852a..a08c127 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -195,27 +195,15 @@ cycle_t ftrace_now(int cpu) u64 ts; /* Early boot up does not have a buffer yet */ - if (!global_trace.buffer) + if (!global_trace.trace_buffer.buffer) return trace_clock_local(); - ts = ring_buffer_time_stamp(global_trace.buffer, cpu); - ring_buffer_normalize_time_stamp(global_trace.buffer, cpu, &ts); + ts = ring_buffer_time_stamp(global_trace.trace_buffer.buffer, cpu); + ring_buffer_normalize_time_stamp(global_trace.trace_buffer.buffer, cpu, &ts); return ts; } -/* - * The max_tr is used to snapshot the global_trace when a maximum - * latency is reached. Some tracers will use this to store a maximum - * trace while it continues examining live traces. - * - * The buffers for the max_tr are set up the same as the global_trace. - * When a snapshot is taken, the link list of the max_tr is swapped - * with the link list of the global_trace and the buffers are reset for - * the global_trace so the tracing can continue. - */ -static struct trace_array max_tr; - int tracing_is_enabled(void) { return tracing_is_on(); @@ -339,8 +327,8 @@ unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | */ void tracing_on(void) { - if (global_trace.buffer) - ring_buffer_record_on(global_trace.buffer); + if (global_trace.trace_buffer.buffer) + ring_buffer_record_on(global_trace.trace_buffer.buffer); /* * This flag is only looked at when buffers haven't been * allocated yet. We don't really care about the race @@ -361,8 +349,8 @@ EXPORT_SYMBOL_GPL(tracing_on); */ void tracing_off(void) { - if (global_trace.buffer) - ring_buffer_record_off(global_trace.buffer); + if (global_trace.trace_buffer.buffer) + ring_buffer_record_off(global_trace.trace_buffer.buffer); /* * This flag is only looked at when buffers haven't been * allocated yet. We don't really care about the race @@ -378,8 +366,8 @@ EXPORT_SYMBOL_GPL(tracing_off); */ int tracing_is_on(void) { - if (global_trace.buffer) - return ring_buffer_record_is_on(global_trace.buffer); + if (global_trace.trace_buffer.buffer) + return ring_buffer_record_is_on(global_trace.trace_buffer.buffer); return !global_trace.buffer_disabled; } EXPORT_SYMBOL_GPL(tracing_is_on); @@ -637,13 +625,14 @@ unsigned long __read_mostly tracing_max_latency; static void __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) { - struct trace_array_cpu *data = per_cpu_ptr(tr->data, cpu); - struct trace_array_cpu *max_data; + struct trace_buffer *trace_buf = &tr->trace_buffer; + struct trace_buffer *max_buf = &tr->max_buffer; + struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); + struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); - max_tr.cpu = cpu; - max_tr.time_start = data->preempt_timestamp; + max_buf->cpu = cpu; + max_buf->time_start = data->preempt_timestamp; - max_data = per_cpu_ptr(max_tr.data, cpu); max_data->saved_latency = tracing_max_latency; max_data->critical_start = data->critical_start; max_data->critical_end = data->critical_end; @@ -686,9 +675,9 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) arch_spin_lock(&ftrace_max_lock); - buf = tr->buffer; - tr->buffer = max_tr.buffer; - max_tr.buffer = buf; + buf = tr->trace_buffer.buffer; + tr->trace_buffer.buffer = tr->max_buffer.buffer; + tr->max_buffer.buffer = buf; __update_max_tr(tr, tsk, cpu); arch_spin_unlock(&ftrace_max_lock); @@ -716,7 +705,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) arch_spin_lock(&ftrace_max_lock); - ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); + ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu); if (ret == -EBUSY) { /* @@ -725,7 +714,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) * the max trace buffer (no one writes directly to it) * and flag that it failed. */ - trace_array_printk(&max_tr, _THIS_IP_, + trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, "Failed to swap buffers due to commit in progress\n"); } @@ -742,7 +731,7 @@ static void default_wait_pipe(struct trace_iterator *iter) if (trace_buffer_iter(iter, iter->cpu_file)) return; - ring_buffer_wait(iter->tr->buffer, iter->cpu_file); + ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file); } /** @@ -803,17 +792,19 @@ int register_tracer(struct tracer *type) * internal tracing to verify that everything is in order. * If we fail, we do not register this tracer. */ - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); tr->current_trace = type; +#ifdef CONFIG_TRACER_MAX_TRACE if (type->use_max_tr) { /* If we expanded the buffers, make sure the max is expanded too */ if (ring_buffer_expanded) - ring_buffer_resize(max_tr.buffer, trace_buf_size, + ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, RING_BUFFER_ALL_CPUS); type->allocated_snapshot = true; } +#endif /* the test is responsible for initializing and enabling */ pr_info("Testing tracer %s: ", type->name); @@ -827,16 +818,18 @@ int register_tracer(struct tracer *type) goto out; } /* Only reset on passing, to avoid touching corrupted buffers */ - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); +#ifdef CONFIG_TRACER_MAX_TRACE if (type->use_max_tr) { type->allocated_snapshot = false; /* Shrink the max buffer again */ if (ring_buffer_expanded) - ring_buffer_resize(max_tr.buffer, 1, + ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); } +#endif printk(KERN_CONT "PASSED\n"); } @@ -870,9 +863,9 @@ int register_tracer(struct tracer *type) return ret; } -void tracing_reset(struct trace_array *tr, int cpu) +void tracing_reset(struct trace_buffer *buf, int cpu) { - struct ring_buffer *buffer = tr->buffer; + struct ring_buffer *buffer = buf->buffer; if (!buffer) return; @@ -886,9 +879,9 @@ void tracing_reset(struct trace_array *tr, int cpu) ring_buffer_record_enable(buffer); } -void tracing_reset_online_cpus(struct trace_array *tr) +void tracing_reset_online_cpus(struct trace_buffer *buf) { - struct ring_buffer *buffer = tr->buffer; + struct ring_buffer *buffer = buf->buffer; int cpu; if (!buffer) @@ -899,7 +892,7 @@ void tracing_reset_online_cpus(struct trace_array *tr) /* Make sure all commits have finished */ synchronize_sched(); - tr->time_start = ftrace_now(tr->cpu); + buf->time_start = ftrace_now(buf->cpu); for_each_online_cpu(cpu) ring_buffer_reset_cpu(buffer, cpu); @@ -909,7 +902,7 @@ void tracing_reset_online_cpus(struct trace_array *tr) void tracing_reset_current(int cpu) { - tracing_reset(&global_trace, cpu); + tracing_reset(&global_trace.trace_buffer, cpu); } void tracing_reset_all_online_cpus(void) @@ -918,7 +911,10 @@ void tracing_reset_all_online_cpus(void) mutex_lock(&trace_types_lock); list_for_each_entry(tr, &ftrace_trace_arrays, list) { - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); +#ifdef CONFIG_TRACER_MAX_TRACE + tracing_reset_online_cpus(&tr->max_buffer); +#endif } mutex_unlock(&trace_types_lock); } @@ -988,13 +984,15 @@ void tracing_start(void) /* Prevent the buffers from switching */ arch_spin_lock(&ftrace_max_lock); - buffer = global_trace.buffer; + buffer = global_trace.trace_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); - buffer = max_tr.buffer; +#ifdef CONFIG_TRACER_MAX_TRACE + buffer = global_trace.max_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); +#endif arch_spin_unlock(&ftrace_max_lock); @@ -1026,7 +1024,7 @@ static void tracing_start_tr(struct trace_array *tr) goto out; } - buffer = tr->buffer; + buffer = tr->trace_buffer.buffer; if (buffer) ring_buffer_record_enable(buffer); @@ -1053,13 +1051,15 @@ void tracing_stop(void) /* Prevent the buffers from switching */ arch_spin_lock(&ftrace_max_lock); - buffer = global_trace.buffer; + buffer = global_trace.trace_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); - buffer = max_tr.buffer; +#ifdef CONFIG_TRACER_MAX_TRACE + buffer = global_trace.max_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); +#endif arch_spin_unlock(&ftrace_max_lock); @@ -1080,7 +1080,7 @@ static void tracing_stop_tr(struct trace_array *tr) if (tr->stop_count++) goto out; - buffer = tr->buffer; + buffer = tr->trace_buffer.buffer; if (buffer) ring_buffer_record_disable(buffer); @@ -1246,7 +1246,7 @@ trace_event_buffer_lock_reserve(struct ring_buffer **current_rb, int type, unsigned long len, unsigned long flags, int pc) { - *current_rb = ftrace_file->tr->buffer; + *current_rb = ftrace_file->tr->trace_buffer.buffer; return trace_buffer_lock_reserve(*current_rb, type, len, flags, pc); } @@ -1257,7 +1257,7 @@ trace_current_buffer_lock_reserve(struct ring_buffer **current_rb, int type, unsigned long len, unsigned long flags, int pc) { - *current_rb = global_trace.buffer; + *current_rb = global_trace.trace_buffer.buffer; return trace_buffer_lock_reserve(*current_rb, type, len, flags, pc); } @@ -1296,7 +1296,7 @@ trace_function(struct trace_array *tr, int pc) { struct ftrace_event_call *call = &event_function; - struct ring_buffer *buffer = tr->buffer; + struct ring_buffer *buffer = tr->trace_buffer.buffer; struct ring_buffer_event *event; struct ftrace_entry *entry; @@ -1437,7 +1437,7 @@ void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, int pc) { - __ftrace_trace_stack(tr->buffer, flags, skip, pc, NULL); + __ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL); } /** @@ -1453,7 +1453,8 @@ void trace_dump_stack(void) local_save_flags(flags); /* skipping 3 traces, seems to get us at the caller of this function */ - __ftrace_trace_stack(global_trace.buffer, flags, 3, preempt_count(), NULL); + __ftrace_trace_stack(global_trace.trace_buffer.buffer, flags, 3, + preempt_count(), NULL); } static DEFINE_PER_CPU(int, user_stack_count); @@ -1623,7 +1624,7 @@ void trace_printk_init_buffers(void) * directly here. If the global_trace.buffer is already * allocated here, then this was called by module code. */ - if (global_trace.buffer) + if (global_trace.trace_buffer.buffer) tracing_start_cmdline_record(); } @@ -1683,7 +1684,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) local_save_flags(flags); size = sizeof(*entry) + sizeof(u32) * len; - buffer = tr->buffer; + buffer = tr->trace_buffer.buffer; event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, flags, pc); if (!event) @@ -1706,27 +1707,12 @@ out: } EXPORT_SYMBOL_GPL(trace_vbprintk); -int trace_array_printk(struct trace_array *tr, - unsigned long ip, const char *fmt, ...) -{ - int ret; - va_list ap; - - if (!(trace_flags & TRACE_ITER_PRINTK)) - return 0; - - va_start(ap, fmt); - ret = trace_array_vprintk(tr, ip, fmt, ap); - va_end(ap); - return ret; -} - -int trace_array_vprintk(struct trace_array *tr, - unsigned long ip, const char *fmt, va_list args) +static int +__trace_array_vprintk(struct ring_buffer *buffer, + unsigned long ip, const char *fmt, va_list args) { struct ftrace_event_call *call = &event_print; struct ring_buffer_event *event; - struct ring_buffer *buffer; int len = 0, size, pc; struct print_entry *entry; unsigned long flags; @@ -1754,7 +1740,6 @@ int trace_array_vprintk(struct trace_array *tr, local_save_flags(flags); size = sizeof(*entry) + len + 1; - buffer = tr->buffer; event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, flags, pc); if (!event) @@ -1775,6 +1760,42 @@ int trace_array_vprintk(struct trace_array *tr, return len; } +int trace_array_vprintk(struct trace_array *tr, + unsigned long ip, const char *fmt, va_list args) +{ + return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args); +} + +int trace_array_printk(struct trace_array *tr, + unsigned long ip, const char *fmt, ...) +{ + int ret; + va_list ap; + + if (!(trace_flags & TRACE_ITER_PRINTK)) + return 0; + + va_start(ap, fmt); + ret = trace_array_vprintk(tr, ip, fmt, ap); + va_end(ap); + return ret; +} + +int trace_array_printk_buf(struct ring_buffer *buffer, + unsigned long ip, const char *fmt, ...) +{ + int ret; + va_list ap; + + if (!(trace_flags & TRACE_ITER_PRINTK)) + return 0; + + va_start(ap, fmt); + ret = __trace_array_vprintk(buffer, ip, fmt, ap); + va_end(ap); + return ret; +} + int trace_vprintk(unsigned long ip, const char *fmt, va_list args) { return trace_array_vprintk(&global_trace, ip, fmt, args); @@ -1800,7 +1821,7 @@ peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, if (buf_iter) event = ring_buffer_iter_peek(buf_iter, ts); else - event = ring_buffer_peek(iter->tr->buffer, cpu, ts, + event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts, lost_events); if (event) { @@ -1815,7 +1836,7 @@ static struct trace_entry * __find_next_entry(struct trace_iterator *iter, int *ent_cpu, unsigned long *missing_events, u64 *ent_ts) { - struct ring_buffer *buffer = iter->tr->buffer; + struct ring_buffer *buffer = iter->trace_buffer->buffer; struct trace_entry *ent, *next = NULL; unsigned long lost_events = 0, next_lost = 0; int cpu_file = iter->cpu_file; @@ -1892,7 +1913,7 @@ void *trace_find_next_entry_inc(struct trace_iterator *iter) static void trace_consume(struct trace_iterator *iter) { - ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts, + ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts, &iter->lost_events); } @@ -1925,13 +1946,12 @@ static void *s_next(struct seq_file *m, void *v, loff_t *pos) void tracing_iter_reset(struct trace_iterator *iter, int cpu) { - struct trace_array *tr = iter->tr; struct ring_buffer_event *event; struct ring_buffer_iter *buf_iter; unsigned long entries = 0; u64 ts; - per_cpu_ptr(tr->data, cpu)->skipped_entries = 0; + per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0; buf_iter = trace_buffer_iter(iter, cpu); if (!buf_iter) @@ -1945,13 +1965,13 @@ void tracing_iter_reset(struct trace_iterator *iter, int cpu) * by the timestamp being before the start of the buffer. */ while ((event = ring_buffer_iter_peek(buf_iter, &ts))) { - if (ts >= iter->tr->time_start) + if (ts >= iter->trace_buffer->time_start) break; entries++; ring_buffer_read(buf_iter, NULL); } - per_cpu_ptr(tr->data, cpu)->skipped_entries = entries; + per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries; } /* @@ -1978,8 +1998,10 @@ static void *s_start(struct seq_file *m, loff_t *pos) *iter->trace = *tr->current_trace; mutex_unlock(&trace_types_lock); +#ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->trace->use_max_tr) return ERR_PTR(-EBUSY); +#endif if (!iter->snapshot) atomic_inc(&trace_record_cmdline_disabled); @@ -2021,17 +2043,21 @@ static void s_stop(struct seq_file *m, void *p) { struct trace_iterator *iter = m->private; +#ifdef CONFIG_TRACER_MAX_TRACE if (iter->snapshot && iter->trace->use_max_tr) return; +#endif if (!iter->snapshot) atomic_dec(&trace_record_cmdline_disabled); + trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); } static void -get_total_entries(struct trace_array *tr, unsigned long *total, unsigned long *entries) +get_total_entries(struct trace_buffer *buf, + unsigned long *total, unsigned long *entries) { unsigned long count; int cpu; @@ -2040,19 +2066,19 @@ get_total_entries(struct trace_array *tr, unsigned long *total, unsigned long *e *entries = 0; for_each_tracing_cpu(cpu) { - count = ring_buffer_entries_cpu(tr->buffer, cpu); + count = ring_buffer_entries_cpu(buf->buffer, cpu); /* * If this buffer has skipped entries, then we hold all * entries for the trace and we need to ignore the * ones before the time stamp. */ - if (per_cpu_ptr(tr->data, cpu)->skipped_entries) { - count -= per_cpu_ptr(tr->data, cpu)->skipped_entries; + if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { + count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; /* total is the same as the entries */ *total += count; } else *total += count + - ring_buffer_overrun_cpu(tr->buffer, cpu); + ring_buffer_overrun_cpu(buf->buffer, cpu); *entries += count; } } @@ -2069,27 +2095,27 @@ static void print_lat_help_header(struct seq_file *m) seq_puts(m, "# \\ / ||||| \\ | / \n"); } -static void print_event_info(struct trace_array *tr, struct seq_file *m) +static void print_event_info(struct trace_buffer *buf, struct seq_file *m) { unsigned long total; unsigned long entries; - get_total_entries(tr, &total, &entries); + get_total_entries(buf, &total, &entries); seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", entries, total, num_online_cpus()); seq_puts(m, "#\n"); } -static void print_func_help_header(struct trace_array *tr, struct seq_file *m) +static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m) { - print_event_info(tr, m); + print_event_info(buf, m); seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); seq_puts(m, "# | | | | |\n"); } -static void print_func_help_header_irq(struct trace_array *tr, struct seq_file *m) +static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m) { - print_event_info(tr, m); + print_event_info(buf, m); seq_puts(m, "# _-----=> irqs-off\n"); seq_puts(m, "# / _----=> need-resched\n"); seq_puts(m, "# | / _---=> hardirq/softirq\n"); @@ -2103,8 +2129,8 @@ void print_trace_header(struct seq_file *m, struct trace_iterator *iter) { unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); - struct trace_array *tr = iter->tr; - struct trace_array_cpu *data = per_cpu_ptr(tr->data, tr->cpu); + struct trace_buffer *buf = iter->trace_buffer; + struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); struct tracer *type = iter->trace; unsigned long entries; unsigned long total; @@ -2112,7 +2138,7 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter) name = type->name; - get_total_entries(tr, &total, &entries); + get_total_entries(buf, &total, &entries); seq_printf(m, "# %s latency trace v1.1.5 on %s\n", name, UTS_RELEASE); @@ -2123,7 +2149,7 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter) nsecs_to_usecs(data->saved_latency), entries, total, - tr->cpu, + buf->cpu, #if defined(CONFIG_PREEMPT_NONE) "server", #elif defined(CONFIG_PREEMPT_VOLUNTARY) @@ -2174,7 +2200,7 @@ static void test_cpu_buff_start(struct trace_iterator *iter) if (cpumask_test_cpu(iter->cpu, iter->started)) return; - if (per_cpu_ptr(iter->tr->data, iter->cpu)->skipped_entries) + if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries) return; cpumask_set_cpu(iter->cpu, iter->started); @@ -2304,7 +2330,7 @@ int trace_empty(struct trace_iterator *iter) if (!ring_buffer_iter_empty(buf_iter)) return 0; } else { - if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) + if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) return 0; } return 1; @@ -2316,7 +2342,7 @@ int trace_empty(struct trace_iterator *iter) if (!ring_buffer_iter_empty(buf_iter)) return 0; } else { - if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) + if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) return 0; } } @@ -2394,9 +2420,9 @@ void trace_default_header(struct seq_file *m) } else { if (!(trace_flags & TRACE_ITER_VERBOSE)) { if (trace_flags & TRACE_ITER_IRQ_INFO) - print_func_help_header_irq(iter->tr, m); + print_func_help_header_irq(iter->trace_buffer, m); else - print_func_help_header(iter->tr, m); + print_func_help_header(iter->trace_buffer, m); } } } @@ -2515,11 +2541,15 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot) if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) goto fail; + iter->tr = tr; + +#ifdef CONFIG_TRACER_MAX_TRACE /* Currently only the top directory has a snapshot */ if (tr->current_trace->print_max || snapshot) - iter->tr = &max_tr; + iter->trace_buffer = &tr->max_buffer; else - iter->tr = tr; +#endif + iter->trace_buffer = &tr->trace_buffer; iter->snapshot = snapshot; iter->pos = -1; mutex_init(&iter->mutex); @@ -2530,7 +2560,7 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot) iter->trace->open(iter); /* Annotate start of buffers if we had overruns */ - if (ring_buffer_overruns(iter->tr->buffer)) + if (ring_buffer_overruns(iter->trace_buffer->buffer)) iter->iter_flags |= TRACE_FILE_ANNOTATE; /* Output in nanoseconds only if we are using a clock in nanoseconds. */ @@ -2544,7 +2574,7 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot) if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) { iter->buffer_iter[cpu] = - ring_buffer_read_prepare(iter->tr->buffer, cpu); + ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); } ring_buffer_read_prepare_sync(); for_each_tracing_cpu(cpu) { @@ -2554,7 +2584,7 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot) } else { cpu = iter->cpu_file; iter->buffer_iter[cpu] = - ring_buffer_read_prepare(iter->tr->buffer, cpu); + ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); ring_buffer_read_prepare_sync(); ring_buffer_read_start(iter->buffer_iter[cpu]); tracing_iter_reset(iter, cpu); @@ -2593,12 +2623,7 @@ static int tracing_release(struct inode *inode, struct file *file) return 0; iter = m->private; - - /* Only the global tracer has a matching max_tr */ - if (iter->tr == &max_tr) - tr = &global_trace; - else - tr = iter->tr; + tr = iter->tr; mutex_lock(&trace_types_lock); for_each_tracing_cpu(cpu) { @@ -2634,9 +2659,9 @@ static int tracing_open(struct inode *inode, struct file *file) struct trace_array *tr = tc->tr; if (tc->cpu == RING_BUFFER_ALL_CPUS) - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); else - tracing_reset(tr, tc->cpu); + tracing_reset(&tr->trace_buffer, tc->cpu); } if (file->f_mode & FMODE_READ) { @@ -2805,13 +2830,13 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf, */ if (cpumask_test_cpu(cpu, tracing_cpumask) && !cpumask_test_cpu(cpu, tracing_cpumask_new)) { - atomic_inc(&per_cpu_ptr(tr->data, cpu)->disabled); - ring_buffer_record_disable_cpu(tr->buffer, cpu); + atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); + ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu); } if (!cpumask_test_cpu(cpu, tracing_cpumask) && cpumask_test_cpu(cpu, tracing_cpumask_new)) { - atomic_dec(&per_cpu_ptr(tr->data, cpu)->disabled); - ring_buffer_record_enable_cpu(tr->buffer, cpu); + atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); + ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu); } } arch_spin_unlock(&ftrace_max_lock); @@ -2930,9 +2955,9 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) trace_event_enable_cmd_record(enabled); if (mask == TRACE_ITER_OVERWRITE) { - ring_buffer_change_overwrite(global_trace.buffer, enabled); + ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled); #ifdef CONFIG_TRACER_MAX_TRACE - ring_buffer_change_overwrite(max_tr.buffer, enabled); + ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); #endif } @@ -3116,42 +3141,44 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf, int tracer_init(struct tracer *t, struct trace_array *tr) { - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); return t->init(tr); } -static void set_buffer_entries(struct trace_array *tr, unsigned long val) +static void set_buffer_entries(struct trace_buffer *buf, unsigned long val) { int cpu; for_each_tracing_cpu(cpu) - per_cpu_ptr(tr->data, cpu)->entries = val; + per_cpu_ptr(buf->data, cpu)->entries = val; } +#ifdef CONFIG_TRACER_MAX_TRACE /* resize @tr's buffer to the size of @size_tr's entries */ -static int resize_buffer_duplicate_size(struct trace_array *tr, - struct trace_array *size_tr, int cpu_id) +static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, + struct trace_buffer *size_buf, int cpu_id) { int cpu, ret = 0; if (cpu_id == RING_BUFFER_ALL_CPUS) { for_each_tracing_cpu(cpu) { - ret = ring_buffer_resize(tr->buffer, - per_cpu_ptr(size_tr->data, cpu)->entries, cpu); + ret = ring_buffer_resize(trace_buf->buffer, + per_cpu_ptr(size_buf->data, cpu)->entries, cpu); if (ret < 0) break; - per_cpu_ptr(tr->data, cpu)->entries = - per_cpu_ptr(size_tr->data, cpu)->entries; + per_cpu_ptr(trace_buf->data, cpu)->entries = + per_cpu_ptr(size_buf->data, cpu)->entries; } } else { - ret = ring_buffer_resize(tr->buffer, - per_cpu_ptr(size_tr->data, cpu_id)->entries, cpu_id); + ret = ring_buffer_resize(trace_buf->buffer, + per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); if (ret == 0) - per_cpu_ptr(tr->data, cpu_id)->entries = - per_cpu_ptr(size_tr->data, cpu_id)->entries; + per_cpu_ptr(trace_buf->data, cpu_id)->entries = + per_cpu_ptr(size_buf->data, cpu_id)->entries; } return ret; } +#endif /* CONFIG_TRACER_MAX_TRACE */ static int __tracing_resize_ring_buffer(struct trace_array *tr, unsigned long size, int cpu) @@ -3166,20 +3193,22 @@ static int __tracing_resize_ring_buffer(struct trace_array *tr, ring_buffer_expanded = 1; /* May be called before buffers are initialized */ - if (!tr->buffer) + if (!tr->trace_buffer.buffer) return 0; - ret = ring_buffer_resize(tr->buffer, size, cpu); + ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu); if (ret < 0) return ret; +#ifdef CONFIG_TRACER_MAX_TRACE if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || !tr->current_trace->use_max_tr) goto out; - ret = ring_buffer_resize(max_tr.buffer, size, cpu); + ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); if (ret < 0) { - int r = resize_buffer_duplicate_size(tr, tr, cpu); + int r = resize_buffer_duplicate_size(&tr->trace_buffer, + &tr->trace_buffer, cpu); if (r < 0) { /* * AARGH! We are left with different @@ -3202,15 +3231,17 @@ static int __tracing_resize_ring_buffer(struct trace_array *tr, } if (cpu == RING_BUFFER_ALL_CPUS) - set_buffer_entries(&max_tr, size); + set_buffer_entries(&tr->max_buffer, size); else - per_cpu_ptr(max_tr.data, cpu)->entries = size; + per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; out: +#endif /* CONFIG_TRACER_MAX_TRACE */ + if (cpu == RING_BUFFER_ALL_CPUS) - set_buffer_entries(tr, size); + set_buffer_entries(&tr->trace_buffer, size); else - per_cpu_ptr(tr->data, cpu)->entries = size; + per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size; return ret; } @@ -3277,7 +3308,9 @@ static int tracing_set_tracer(const char *buf) static struct trace_option_dentry *topts; struct trace_array *tr = &global_trace; struct tracer *t; +#ifdef CONFIG_TRACER_MAX_TRACE bool had_max_tr; +#endif int ret = 0; mutex_lock(&trace_types_lock); @@ -3308,7 +3341,10 @@ static int tracing_set_tracer(const char *buf) if (tr->current_trace->reset) tr->current_trace->reset(tr); +#ifdef CONFIG_TRACER_MAX_TRACE had_max_tr = tr->current_trace->allocated_snapshot; + + /* Current trace needs to be nop_trace before synchronize_sched */ tr->current_trace = &nop_trace; if (had_max_tr && !t->use_max_tr) { @@ -3325,22 +3361,28 @@ static int tracing_set_tracer(const char *buf) * The max_tr ring buffer has some state (e.g. ring->clock) and * we want preserve it. */ - ring_buffer_resize(max_tr.buffer, 1, RING_BUFFER_ALL_CPUS); - set_buffer_entries(&max_tr, 1); - tracing_reset_online_cpus(&max_tr); + ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); + set_buffer_entries(&tr->max_buffer, 1); + tracing_reset_online_cpus(&tr->max_buffer); tr->current_trace->allocated_snapshot = false; } +#else + tr->current_trace = &nop_trace; +#endif destroy_trace_option_files(topts); topts = create_trace_option_files(tr, t); + +#ifdef CONFIG_TRACER_MAX_TRACE if (t->use_max_tr && !had_max_tr) { /* we need to make per cpu buffer sizes equivalent */ - ret = resize_buffer_duplicate_size(&max_tr, &global_trace, + ret = resize_buffer_duplicate_size(&tr->max_buffer, &tr->trace_buffer, RING_BUFFER_ALL_CPUS); if (ret < 0) goto out; t->allocated_snapshot = true; } +#endif if (t->init) { ret = tracer_init(t, tr); @@ -3468,6 +3510,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp) iter->cpu_file = tc->cpu; iter->tr = tc->tr; + iter->trace_buffer = &tc->tr->trace_buffer; mutex_init(&iter->mutex); filp->private_data = iter; @@ -3518,7 +3561,7 @@ trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_tabl */ return POLLIN | POLLRDNORM; else - return ring_buffer_poll_wait(iter->tr->buffer, iter->cpu_file, + return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file, filp, poll_table); } @@ -3857,8 +3900,8 @@ tracing_entries_read(struct file *filp, char __user *ubuf, for_each_tracing_cpu(cpu) { /* fill in the size from first enabled cpu */ if (size == 0) - size = per_cpu_ptr(tr->data, cpu)->entries; - if (size != per_cpu_ptr(tr->data, cpu)->entries) { + size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries; + if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) { buf_size_same = 0; break; } @@ -3874,7 +3917,7 @@ tracing_entries_read(struct file *filp, char __user *ubuf, } else r = sprintf(buf, "X\n"); } else - r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->data, tc->cpu)->entries >> 10); + r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, tc->cpu)->entries >> 10); mutex_unlock(&trace_types_lock); @@ -3921,7 +3964,7 @@ tracing_total_entries_read(struct file *filp, char __user *ubuf, mutex_lock(&trace_types_lock); for_each_tracing_cpu(cpu) { - size += per_cpu_ptr(tr->data, cpu)->entries >> 10; + size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10; if (!ring_buffer_expanded) expanded_size += trace_buf_size >> 10; } @@ -4026,7 +4069,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf, local_save_flags(irq_flags); size = sizeof(*entry) + cnt + 2; /* possible \n added */ - buffer = global_trace.buffer; + buffer = global_trace.trace_buffer.buffer; event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, irq_flags, preempt_count()); if (!event) { @@ -4111,16 +4154,19 @@ static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, tr->clock_id = i; - ring_buffer_set_clock(tr->buffer, trace_clocks[i].func); - if (tr->flags & TRACE_ARRAY_FL_GLOBAL && max_tr.buffer) - ring_buffer_set_clock(max_tr.buffer, trace_clocks[i].func); + ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func); /* * New clock may not be consistent with the previous clock. * Reset the buffer so that it doesn't have incomparable timestamps. */ - tracing_reset_online_cpus(&global_trace); - tracing_reset_online_cpus(&max_tr); + tracing_reset_online_cpus(&global_trace.trace_buffer); + +#ifdef CONFIG_TRACER_MAX_TRACE + if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer) + ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); + tracing_reset_online_cpus(&global_trace.max_buffer); +#endif mutex_unlock(&trace_types_lock); @@ -4160,6 +4206,7 @@ static int tracing_snapshot_open(struct inode *inode, struct file *file) return -ENOMEM; } iter->tr = tc->tr; + iter->trace_buffer = &tc->tr->max_buffer; m->private = iter; file->private_data = m; } @@ -4196,18 +4243,18 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, case 0: if (tr->current_trace->allocated_snapshot) { /* free spare buffer */ - ring_buffer_resize(max_tr.buffer, 1, + ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); - set_buffer_entries(&max_tr, 1); - tracing_reset_online_cpus(&max_tr); + set_buffer_entries(&tr->max_buffer, 1); + tracing_reset_online_cpus(&tr->max_buffer); tr->current_trace->allocated_snapshot = false; } break; case 1: if (!tr->current_trace->allocated_snapshot) { /* allocate spare buffer */ - ret = resize_buffer_duplicate_size(&max_tr, - &global_trace, RING_BUFFER_ALL_CPUS); + ret = resize_buffer_duplicate_size(&tr->max_buffer, + &tr->trace_buffer, RING_BUFFER_ALL_CPUS); if (ret < 0) break; tr->current_trace->allocated_snapshot = true; @@ -4220,7 +4267,7 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, break; default: if (tr->current_trace->allocated_snapshot) - tracing_reset_online_cpus(&max_tr); + tracing_reset_online_cpus(&tr->max_buffer); break; } @@ -4338,6 +4385,7 @@ static int tracing_buffers_open(struct inode *inode, struct file *filp) info->iter.tr = tr; info->iter.cpu_file = tc->cpu; info->iter.trace = tr->current_trace; + info->iter.trace_buffer = &tr->trace_buffer; info->spare = NULL; /* Force reading ring buffer for first read */ info->read = (unsigned int)-1; @@ -4369,7 +4417,8 @@ tracing_buffers_read(struct file *filp, char __user *ubuf, return 0; if (!info->spare) - info->spare = ring_buffer_alloc_read_page(iter->tr->buffer, iter->cpu_file); + info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer, + iter->cpu_file); if (!info->spare) return -ENOMEM; @@ -4379,7 +4428,7 @@ tracing_buffers_read(struct file *filp, char __user *ubuf, again: trace_access_lock(iter->cpu_file); - ret = ring_buffer_read_page(iter->tr->buffer, + ret = ring_buffer_read_page(iter->trace_buffer->buffer, &info->spare, count, iter->cpu_file, 0); @@ -4421,7 +4470,7 @@ static int tracing_buffers_release(struct inode *inode, struct file *file) struct trace_iterator *iter = &info->iter; if (info->spare) - ring_buffer_free_read_page(iter->tr->buffer, info->spare); + ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare); kfree(info); return 0; @@ -4521,7 +4570,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, again: trace_access_lock(iter->cpu_file); - entries = ring_buffer_entries_cpu(iter->tr->buffer, iter->cpu_file); + entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) { struct page *page; @@ -4532,7 +4581,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, break; ref->ref = 1; - ref->buffer = iter->tr->buffer; + ref->buffer = iter->trace_buffer->buffer; ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); if (!ref->page) { kfree(ref); @@ -4564,7 +4613,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, spd.nr_pages++; *ppos += PAGE_SIZE; - entries = ring_buffer_entries_cpu(iter->tr->buffer, iter->cpu_file); + entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); } trace_access_unlock(iter->cpu_file); @@ -4605,6 +4654,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf, { struct trace_cpu *tc = filp->private_data; struct trace_array *tr = tc->tr; + struct trace_buffer *trace_buf = &tr->trace_buffer; struct trace_seq *s; unsigned long cnt; unsigned long long t; @@ -4617,41 +4667,41 @@ tracing_stats_read(struct file *filp, char __user *ubuf, trace_seq_init(s); - cnt = ring_buffer_entries_cpu(tr->buffer, cpu); + cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "entries: %ld\n", cnt); - cnt = ring_buffer_overrun_cpu(tr->buffer, cpu); + cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "overrun: %ld\n", cnt); - cnt = ring_buffer_commit_overrun_cpu(tr->buffer, cpu); + cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "commit overrun: %ld\n", cnt); - cnt = ring_buffer_bytes_cpu(tr->buffer, cpu); + cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "bytes: %ld\n", cnt); if (trace_clocks[trace_clock_id].in_ns) { /* local or global for trace_clock */ - t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu)); + t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); usec_rem = do_div(t, USEC_PER_SEC); trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", t, usec_rem); - t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu)); + t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); usec_rem = do_div(t, USEC_PER_SEC); trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); } else { /* counter or tsc mode for trace_clock */ trace_seq_printf(s, "oldest event ts: %llu\n", - ring_buffer_oldest_event_ts(tr->buffer, cpu)); + ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); trace_seq_printf(s, "now ts: %llu\n", - ring_buffer_time_stamp(tr->buffer, cpu)); + ring_buffer_time_stamp(trace_buf->buffer, cpu)); } - cnt = ring_buffer_dropped_events_cpu(tr->buffer, cpu); + cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "dropped events: %ld\n", cnt); - cnt = ring_buffer_read_events_cpu(tr->buffer, cpu); + cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); trace_seq_printf(s, "read events: %ld\n", cnt); count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len); @@ -4754,7 +4804,7 @@ static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) static void tracing_init_debugfs_percpu(struct trace_array *tr, long cpu) { - struct trace_array_cpu *data = per_cpu_ptr(tr->data, cpu); + struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.data, cpu); struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); struct dentry *d_cpu; char cpu_dir[30]; /* 30 characters should be more than enough */ @@ -5038,7 +5088,7 @@ rb_simple_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; - struct ring_buffer *buffer = tr->buffer; + struct ring_buffer *buffer = tr->trace_buffer.buffer; char buf[64]; int r; @@ -5057,7 +5107,7 @@ rb_simple_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) { struct trace_array *tr = filp->private_data; - struct ring_buffer *buffer = tr->buffer; + struct ring_buffer *buffer = tr->trace_buffer.buffer; unsigned long val; int ret; @@ -5129,18 +5179,18 @@ static int new_instance_create(const char *name) rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; - tr->buffer = ring_buffer_alloc(trace_buf_size, rb_flags); - if (!tr->buffer) + tr->trace_buffer.buffer = ring_buffer_alloc(trace_buf_size, rb_flags); + if (!tr->trace_buffer.buffer) goto out_free_tr; - tr->data = alloc_percpu(struct trace_array_cpu); - if (!tr->data) + tr->trace_buffer.data = alloc_percpu(struct trace_array_cpu); + if (!tr->trace_buffer.data) goto out_free_tr; for_each_tracing_cpu(i) { - memset(per_cpu_ptr(tr->data, i), 0, sizeof(struct trace_array_cpu)); - per_cpu_ptr(tr->data, i)->trace_cpu.cpu = i; - per_cpu_ptr(tr->data, i)->trace_cpu.tr = tr; + memset(per_cpu_ptr(tr->trace_buffer.data, i), 0, sizeof(struct trace_array_cpu)); + per_cpu_ptr(tr->trace_buffer.data, i)->trace_cpu.cpu = i; + per_cpu_ptr(tr->trace_buffer.data, i)->trace_cpu.tr = tr; } /* Holder for file callbacks */ @@ -5164,8 +5214,8 @@ static int new_instance_create(const char *name) return 0; out_free_tr: - if (tr->buffer) - ring_buffer_free(tr->buffer); + if (tr->trace_buffer.buffer) + ring_buffer_free(tr->trace_buffer.buffer); kfree(tr->name); kfree(tr); @@ -5198,8 +5248,8 @@ static int instance_delete(const char *name) event_trace_del_tracer(tr); debugfs_remove_recursive(tr->dir); - free_percpu(tr->data); - ring_buffer_free(tr->buffer); + free_percpu(tr->trace_buffer.data); + ring_buffer_free(tr->trace_buffer.buffer); kfree(tr->name); kfree(tr); @@ -5439,6 +5489,7 @@ void trace_init_global_iter(struct trace_iterator *iter) iter->tr = &global_trace; iter->trace = iter->tr->current_trace; iter->cpu_file = RING_BUFFER_ALL_CPUS; + iter->trace_buffer = &global_trace.trace_buffer; } static void @@ -5476,7 +5527,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode) trace_init_global_iter(&iter); for_each_tracing_cpu(cpu) { - atomic_inc(&per_cpu_ptr(iter.tr->data, cpu)->disabled); + atomic_inc(&per_cpu_ptr(iter.tr->trace_buffer.data, cpu)->disabled); } old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ; @@ -5544,7 +5595,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode) trace_flags |= old_userobj; for_each_tracing_cpu(cpu) { - atomic_dec(&per_cpu_ptr(iter.tr->data, cpu)->disabled); + atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); } tracing_on(); } @@ -5594,58 +5645,59 @@ __init static int tracer_alloc_buffers(void) raw_spin_lock_init(&global_trace.start_lock); /* TODO: make the number of buffers hot pluggable with CPUS */ - global_trace.buffer = ring_buffer_alloc(ring_buf_size, rb_flags); - if (!global_trace.buffer) { + global_trace.trace_buffer.buffer = ring_buffer_alloc(ring_buf_size, rb_flags); + if (!global_trace.trace_buffer.buffer) { printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); WARN_ON(1); goto out_free_cpumask; } - global_trace.data = alloc_percpu(struct trace_array_cpu); + global_trace.trace_buffer.data = alloc_percpu(struct trace_array_cpu); - if (!global_trace.data) { + if (!global_trace.trace_buffer.data) { printk(KERN_ERR "tracer: failed to allocate percpu memory!\n"); WARN_ON(1); goto out_free_cpumask; } for_each_tracing_cpu(i) { - memset(per_cpu_ptr(global_trace.data, i), 0, sizeof(struct trace_array_cpu)); - per_cpu_ptr(global_trace.data, i)->trace_cpu.cpu = i; - per_cpu_ptr(global_trace.data, i)->trace_cpu.tr = &global_trace; + memset(per_cpu_ptr(global_trace.trace_buffer.data, i), 0, + sizeof(struct trace_array_cpu)); + per_cpu_ptr(global_trace.trace_buffer.data, i)->trace_cpu.cpu = i; + per_cpu_ptr(global_trace.trace_buffer.data, i)->trace_cpu.tr = &global_trace; } if (global_trace.buffer_disabled) tracing_off(); #ifdef CONFIG_TRACER_MAX_TRACE - max_tr.data = alloc_percpu(struct trace_array_cpu); - if (!max_tr.data) { + global_trace.max_buffer.data = alloc_percpu(struct trace_array_cpu); + if (!global_trace.max_buffer.data) { printk(KERN_ERR "tracer: failed to allocate percpu memory!\n"); WARN_ON(1); goto out_free_cpumask; } - max_tr.buffer = ring_buffer_alloc(1, rb_flags); - raw_spin_lock_init(&max_tr.start_lock); - if (!max_tr.buffer) { + global_trace.max_buffer.buffer = ring_buffer_alloc(1, rb_flags); + if (!global_trace.max_buffer.buffer) { printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); WARN_ON(1); - ring_buffer_free(global_trace.buffer); + ring_buffer_free(global_trace.trace_buffer.buffer); goto out_free_cpumask; } for_each_tracing_cpu(i) { - memset(per_cpu_ptr(max_tr.data, i), 0, sizeof(struct trace_array_cpu)); - per_cpu_ptr(max_tr.data, i)->trace_cpu.cpu = i; - per_cpu_ptr(max_tr.data, i)->trace_cpu.tr = &max_tr; + memset(per_cpu_ptr(global_trace.max_buffer.data, i), 0, + sizeof(struct trace_array_cpu)); + per_cpu_ptr(global_trace.max_buffer.data, i)->trace_cpu.cpu = i; + per_cpu_ptr(global_trace.max_buffer.data, i)->trace_cpu.tr = &global_trace; } #endif /* Allocate the first page for all buffers */ - set_buffer_entries(&global_trace, - ring_buffer_size(global_trace.buffer, 0)); + set_buffer_entries(&global_trace.trace_buffer, + ring_buffer_size(global_trace.trace_buffer.buffer, 0)); #ifdef CONFIG_TRACER_MAX_TRACE - set_buffer_entries(&max_tr, 1); + set_buffer_entries(&global_trace.max_buffer, 1); #endif trace_init_cmdlines(); @@ -5682,8 +5734,10 @@ __init static int tracer_alloc_buffers(void) return 0; out_free_cpumask: - free_percpu(global_trace.data); - free_percpu(max_tr.data); + free_percpu(global_trace.trace_buffer.data); +#ifdef CONFIG_TRACER_MAX_TRACE + free_percpu(global_trace.max_buffer.data); +#endif free_cpumask_var(tracing_cpumask); out_free_buffer_mask: free_cpumask_var(tracing_buffer_mask); |