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tracing: Move trace_flags from global to a trace_array field

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In preparation to make trace options per instance, the global trace_flags
needs to be moved from being a global variable to a field within the trace
instance trace_array structure.

There's still more work to do, as there's some functions that use
trace_flags without passing in a way to get to the current_trace array. For
those, the global_trace is used directly (from trace.c). This includes
setting and clearing the trace_flags. This means that when a new instance is
created, it just gets the trace_flags of the global_trace and will not be
able to modify them. Depending on the functions that have access to the
trace_array, the flags of an instance may not affect parts of its trace,
where the global_trace is used. These will be fixed in future changes.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2015-09-30 09:42:05 -04:00
committed by Steven Rostedt
parent 5557720415
commit 983f938ae6
10 changed files with 135 additions and 101 deletions
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14
kernel/trace/trace_output.c
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@@ -476,7 +476,8 @@ char trace_find_mark(unsigned long long d)
static int
lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
{
unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
struct trace_array *tr = iter->tr;
unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
unsigned long long rel_ts = next_ts - iter->ts;
@@ -519,6 +520,7 @@ lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
int trace_print_context(struct trace_iterator *iter)
{
struct trace_array *tr = iter->tr;
struct trace_seq *s = &iter->seq;
struct trace_entry *entry = iter->ent;
unsigned long long t;
@@ -530,7 +532,7 @@ int trace_print_context(struct trace_iterator *iter)
trace_seq_printf(s, "%16s-%-5d [%03d] ",
comm, entry->pid, iter->cpu);
if (trace_flags & TRACE_ITER_IRQ_INFO)
if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
trace_print_lat_fmt(s, entry);
if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
@@ -546,14 +548,15 @@ int trace_print_context(struct trace_iterator *iter)
int trace_print_lat_context(struct trace_iterator *iter)
{
u64 next_ts;
struct trace_array *tr = iter->tr;
/* trace_find_next_entry will reset ent_size */
int ent_size = iter->ent_size;
struct trace_seq *s = &iter->seq;
u64 next_ts;
struct trace_entry *entry = iter->ent,
*next_entry = trace_find_next_entry(iter, NULL,
&next_ts);
unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
/* Restore the original ent_size */
iter->ent_size = ent_size;
@@ -1035,6 +1038,7 @@ static struct trace_event trace_stack_event = {
static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
int flags, struct trace_event *event)
{
struct trace_array *tr = iter->tr;
struct userstack_entry *field;
struct trace_seq *s = &iter->seq;
struct mm_struct *mm = NULL;
@@ -1044,7 +1048,7 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
trace_seq_puts(s, "<user stack trace>\n");
if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
struct task_struct *task;
/*
* we do the lookup on the thread group leader,