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tracing: Use RING_BUFFER_ALL_CPUS for TRACE_PIPE_ALL_CPU

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Both RING_BUFFER_ALL_CPUS and TRACE_PIPE_ALL_CPU are defined as
-1 and used to say that all the ring buffers are to be modified
or read (instead of just a single cpu, which would be >= 0).

There's no reason to keep TRACE_PIPE_ALL_CPU as it is also started
to be used for more than what it was created for, and now that
the ring buffer code added a generic RING_BUFFER_ALL_CPUS define,
we can clean up the trace code to use that instead and remove
the TRACE_PIPE_ALL_CPU macro.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2013-01-23 15:22:59 -05:00 committed by Steven Rostedt
parent ae63b31e4d
commit ae3b5093ad
3 changed files with 16 additions and 18 deletions
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28
kernel/trace/trace.c
View File

@ -287,13 +287,13 @@ static DEFINE_PER_CPU(struct mutex, cpu_access_lock);
static inline void trace_access_lock(int cpu)
{
if (cpu == TRACE_PIPE_ALL_CPU) {
if (cpu == RING_BUFFER_ALL_CPUS) {
/* gain it for accessing the whole ring buffer. */
down_write(&all_cpu_access_lock);
} else {
/* gain it for accessing a cpu ring buffer. */
/* Firstly block other trace_access_lock(TRACE_PIPE_ALL_CPU). */
/* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */
down_read(&all_cpu_access_lock);
/* Secondly block other access to this @cpu ring buffer. */
@ -303,7 +303,7 @@ static inline void trace_access_lock(int cpu)
static inline void trace_access_unlock(int cpu)
{
if (cpu == TRACE_PIPE_ALL_CPU) {
if (cpu == RING_BUFFER_ALL_CPUS) {
up_write(&all_cpu_access_lock);
} else {
mutex_unlock(&per_cpu(cpu_access_lock, cpu));
@ -1823,7 +1823,7 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu,
* If we are in a per_cpu trace file, don't bother by iterating over
* all cpu and peek directly.
*/
if (cpu_file > TRACE_PIPE_ALL_CPU) {
if (cpu_file > RING_BUFFER_ALL_CPUS) {
if (ring_buffer_empty_cpu(buffer, cpu_file))
return NULL;
ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events);
@ -1983,7 +1983,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
iter->cpu = 0;
iter->idx = -1;
if (cpu_file == TRACE_PIPE_ALL_CPU) {
if (cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu)
tracing_iter_reset(iter, cpu);
} else
@ -2291,7 +2291,7 @@ int trace_empty(struct trace_iterator *iter)
int cpu;
/* If we are looking at one CPU buffer, only check that one */
if (iter->cpu_file != TRACE_PIPE_ALL_CPU) {
if (iter->cpu_file != RING_BUFFER_ALL_CPUS) {
cpu = iter->cpu_file;
buf_iter = trace_buffer_iter(iter, cpu);
if (buf_iter) {
@ -2533,7 +2533,7 @@ __tracing_open(struct inode *inode, struct file *file, bool snapshot)
if (!iter->snapshot)
tracing_stop();
if (iter->cpu_file == TRACE_PIPE_ALL_CPU) {
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);
@ -2617,7 +2617,7 @@ static int tracing_open(struct inode *inode, struct file *file)
(file->f_flags & O_TRUNC)) {
long cpu = (long) inode->i_private;
if (cpu == TRACE_PIPE_ALL_CPU)
if (cpu == RING_BUFFER_ALL_CPUS)
tracing_reset_online_cpus(&global_trace);
else
tracing_reset(&global_trace, cpu);
@ -5035,7 +5035,7 @@ static __init int tracer_init_debugfs(void)
NULL, &tracing_cpumask_fops);
trace_create_file("trace", 0644, d_tracer,
(void *) TRACE_PIPE_ALL_CPU, &tracing_fops);
(void *) RING_BUFFER_ALL_CPUS, &tracing_fops);
trace_create_file("available_tracers", 0444, d_tracer,
&global_trace, &show_traces_fops);
@ -5055,7 +5055,7 @@ static __init int tracer_init_debugfs(void)
NULL, &tracing_readme_fops);
trace_create_file("trace_pipe", 0444, d_tracer,
(void *) TRACE_PIPE_ALL_CPU, &tracing_pipe_fops);
(void *) RING_BUFFER_ALL_CPUS, &tracing_pipe_fops);
trace_create_file("buffer_size_kb", 0644, d_tracer,
(void *) RING_BUFFER_ALL_CPUS, &tracing_entries_fops);
@ -5085,7 +5085,7 @@ static __init int tracer_init_debugfs(void)
#ifdef CONFIG_TRACER_SNAPSHOT
trace_create_file("snapshot", 0644, d_tracer,
(void *) TRACE_PIPE_ALL_CPU, &snapshot_fops);
(void *) RING_BUFFER_ALL_CPUS, &snapshot_fops);
#endif
create_trace_options_dir();
@ -5162,7 +5162,7 @@ void trace_init_global_iter(struct trace_iterator *iter)
{
iter->tr = &global_trace;
iter->trace = current_trace;
iter->cpu_file = TRACE_PIPE_ALL_CPU;
iter->cpu_file = RING_BUFFER_ALL_CPUS;
}
static void
@ -5210,7 +5210,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
switch (oops_dump_mode) {
case DUMP_ALL:
iter.cpu_file = TRACE_PIPE_ALL_CPU;
iter.cpu_file = RING_BUFFER_ALL_CPUS;
break;
case DUMP_ORIG:
iter.cpu_file = raw_smp_processor_id();
@ -5219,7 +5219,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
goto out_enable;
default:
printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n");
iter.cpu_file = TRACE_PIPE_ALL_CPU;
iter.cpu_file = RING_BUFFER_ALL_CPUS;
}
printk(KERN_TRACE "Dumping ftrace buffer:\n");

2
kernel/trace/trace.h
View File

@ -453,8 +453,6 @@ static __always_inline void trace_clear_recursion(int bit)
current->trace_recursion = val;
}
#define TRACE_PIPE_ALL_CPU -1
static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator *iter, int cpu)
{

4
kernel/trace/trace_kdb.c
View File

@ -43,7 +43,7 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
iter.iter_flags |= TRACE_FILE_LAT_FMT;
iter.pos = -1;
if (cpu_file == TRACE_PIPE_ALL_CPU) {
if (cpu_file == RING_BUFFER_ALL_CPUS) {
for_each_tracing_cpu(cpu) {
iter.buffer_iter[cpu] =
ring_buffer_read_prepare(iter.tr->buffer, cpu);
@ -115,7 +115,7 @@ static int kdb_ftdump(int argc, const char **argv)
!cpu_online(cpu_file))
return KDB_BADINT;
} else {
cpu_file = TRACE_PIPE_ALL_CPU;
cpu_file = RING_BUFFER_ALL_CPUS;
}
kdb_trap_printk++;