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ftrace: remove obsolete print continue functionality 

Impact: cleanup, remove obsolete code

Now that the ring buffer used by ftrace allows for variable length
entries, we do not need the 'cont' feature of the buffer.  This code
makes other parts of ftrace more complex and by removing this it
simplifies the ftrace code.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-12-23 23:24:11 -05:00 committed by Ingo Molnar
parent 0f01f07fad
commit c47956d9ae
4 changed files with 0 additions and 74 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
kernel/trace/trace.c
View File

@ -1765,43 +1765,6 @@ static int task_state_char(unsigned long state)
return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
}
/*
* The message is supposed to contain an ending newline.
* If the printing stops prematurely, try to add a newline of our own.
*/
void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
{
struct trace_entry *ent;
struct trace_field_cont *cont;
bool ok = true;
ent = peek_next_entry(iter, iter->cpu, NULL);
if (!ent || ent->type != TRACE_CONT) {
trace_seq_putc(s, '\n');
return;
}
do {
cont = (struct trace_field_cont *)ent;
if (ok)
ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
ftrace_disable_cpu();
if (iter->buffer_iter[iter->cpu])
ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
else
ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
ftrace_enable_cpu();
ent = peek_next_entry(iter, iter->cpu, NULL);
} while (ent && ent->type == TRACE_CONT);
if (!ok)
trace_seq_putc(s, '\n');
}
static void test_cpu_buff_start(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
@ -1834,9 +1797,6 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
int S, T;
int i;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
test_cpu_buff_start(iter);
next_entry = find_next_entry(iter, NULL, &next_ts);
@ -1922,8 +1882,6 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
seq_print_ip_sym(s, field->ip, sym_flags);
trace_seq_printf(s, ": %s", field->buf);
if (entry->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
break;
}
case TRACE_BRANCH: {
@ -1968,9 +1926,6 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
test_cpu_buff_start(iter);
comm = trace_find_cmdline(iter->ent->pid);
@ -2076,8 +2031,6 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
seq_print_ip_sym(s, field->ip, sym_flags);
trace_seq_printf(s, ": %s", field->buf);
if (entry->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
break;
}
case TRACE_GRAPH_RET: {
@ -2124,9 +2077,6 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
ret = trace_seq_printf(s, "%d %d %llu ",
entry->pid, iter->cpu, iter->ts);
if (!ret)
@ -2187,8 +2137,6 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
trace_assign_type(field, entry);
trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
if (entry->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
break;
}
}
@ -2217,9 +2165,6 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
@ -2283,9 +2228,6 @@ static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
if (entry->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
return TRACE_TYPE_HANDLED;
}
@ -2296,9 +2238,6 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
entry = iter->ent;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
SEQ_PUT_FIELD_RET(s, entry->pid);
SEQ_PUT_FIELD_RET(s, entry->cpu);
SEQ_PUT_FIELD_RET(s, iter->ts);

7
kernel/trace/trace.h
View File

@ -16,7 +16,6 @@ enum trace_type {
TRACE_FN,
TRACE_CTX,
TRACE_WAKE,
TRACE_CONT,
TRACE_STACK,
TRACE_PRINT,
TRACE_SPECIAL,
@ -178,7 +177,6 @@ struct trace_power {
* NEED_RESCED - reschedule is requested
* HARDIRQ - inside an interrupt handler
* SOFTIRQ - inside a softirq handler
* CONT - multiple entries hold the trace item
*/
enum trace_flag_type {
TRACE_FLAG_IRQS_OFF = 0x01,
@ -186,7 +184,6 @@ enum trace_flag_type {
TRACE_FLAG_NEED_RESCHED = 0x04,
TRACE_FLAG_HARDIRQ = 0x08,
TRACE_FLAG_SOFTIRQ = 0x10,
TRACE_FLAG_CONT = 0x20,
};
#define TRACE_BUF_SIZE 1024
@ -262,7 +259,6 @@ extern void __ftrace_bad_type(void);
do { \
IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
@ -489,9 +485,6 @@ extern int trace_selftest_startup_branch(struct tracer *trace,
extern void *head_page(struct trace_array_cpu *data);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
extern void trace_seq_print_cont(struct trace_seq *s,
struct trace_iterator *iter);
extern int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
unsigned long sym_flags);

3
kernel/trace/trace_functions_graph.c
View File

@ -589,9 +589,6 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
if (ent->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
/* Strip ending newline */
if (s->buffer[s->len - 1] == '\n') {
s->buffer[s->len - 1] = '\0';

3
kernel/trace/trace_mmiotrace.c
View File

@ -262,9 +262,6 @@ static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
if (entry->flags & TRACE_FLAG_CONT)
trace_seq_print_cont(s, iter);
return TRACE_TYPE_HANDLED;
}