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blktrace: extract duplidate code 

Impact: cleanup

blk_trace_event_print() and blk_tracer_print_line() share most of the code.

   text    data     bss     dec     hex filename
   8605     393      12    9010    2332 kernel/trace/blktrace.o.orig
   text    data     bss     dec     hex filename
   8555     393      12    8960    2300 kernel/trace/blktrace.o

This patch also prepares for the next patch, that prints out BLK_TN_MESSAGE.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-03-27 10:21:23 +08:00 committed by Ingo Molnar
parent ad5dd5493a
commit b6a4b0c3ad
1 changed files with 30 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
kernel/trace/blktrace.c
View File

@ -986,29 +986,31 @@ static void get_pdu_remap(const struct trace_entry *ent,
r->sector = be64_to_cpu(sector);
}
static int blk_log_action_iter(struct trace_iterator *iter, const char *act)
typedef int (blk_log_action_t) (struct trace_iterator *iter, const char *act);
static int blk_log_action_classic(struct trace_iterator *iter, const char *act)
{
char rwbs[6];
unsigned long long ts = iter->ts;
unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC);
unsigned secs = (unsigned long)ts;
const struct trace_entry *ent = iter->ent;
const struct blk_io_trace *t = (const struct blk_io_trace *)ent;
const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
fill_rwbs(rwbs, t);
return trace_seq_printf(&iter->seq,
"%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
MAJOR(t->device), MINOR(t->device), iter->cpu,
secs, nsec_rem, ent->pid, act, rwbs);
secs, nsec_rem, iter->ent->pid, act, rwbs);
}
static int blk_log_action_seq(struct trace_seq *s, const struct blk_io_trace *t,
const char *act)
static int blk_log_action(struct trace_iterator *iter, const char *act)
{
char rwbs[6];
const struct blk_io_trace *t = te_blk_io_trace(iter->ent);
fill_rwbs(rwbs, t);
return trace_seq_printf(s, "%3d,%-3d %2s %3s ",
return trace_seq_printf(&iter->seq, "%3d,%-3d %2s %3s ",
MAJOR(t->device), MINOR(t->device), act, rwbs);
}
@ -1129,22 +1131,25 @@ static const struct {
[__BLK_TA_REMAP] = {{ "A", "remap" }, blk_log_remap },
};
static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
int flags)
static enum print_line_t print_one_line(struct trace_iterator *iter,
bool classic)
{
struct trace_seq *s = &iter->seq;
const struct blk_io_trace *t = (struct blk_io_trace *)iter->ent;
const u16 what = t->action & ((1 << BLK_TC_SHIFT) - 1);
const struct blk_io_trace *t;
u16 what;
int ret;
bool long_act;
blk_log_action_t *log_action;
if (!trace_print_context(iter))
return TRACE_TYPE_PARTIAL_LINE;
t = te_blk_io_trace(iter->ent);
what = t->action & ((1 << BLK_TC_SHIFT) - 1);
long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
log_action = classic ? &blk_log_action_classic : &blk_log_action;
if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
ret = trace_seq_printf(s, "Bad pc action %x\n", what);
else {
const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
ret = blk_log_action_seq(s, t, what2act[what].act[long_act]);
ret = log_action(iter, what2act[what].act[long_act]);
if (ret)
ret = what2act[what].print(s, iter->ent);
}
@ -1152,6 +1157,15 @@ static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
}
static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
int flags)
{
if (!trace_print_context(iter))
return TRACE_TYPE_PARTIAL_LINE;
return print_one_line(iter, false);
}
static int blk_trace_synthesize_old_trace(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
@ -1177,26 +1191,10 @@ blk_trace_event_print_binary(struct trace_iterator *iter, int flags)
static enum print_line_t blk_tracer_print_line(struct trace_iterator *iter)
{
const struct blk_io_trace *t;
u16 what;
int ret;
if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CLASSIC))
return TRACE_TYPE_UNHANDLED;
t = (const struct blk_io_trace *)iter->ent;
what = t->action & ((1 << BLK_TC_SHIFT) - 1);
if (unlikely(what == 0 || what >= ARRAY_SIZE(what2act)))
ret = trace_seq_printf(&iter->seq, "Bad pc action %x\n", what);
else {
const bool long_act = !!(trace_flags & TRACE_ITER_VERBOSE);
ret = blk_log_action_iter(iter, what2act[what].act[long_act]);
if (ret)
ret = what2act[what].print(&iter->seq, iter->ent);
}
return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
return print_one_line(iter, true);
}
static struct tracer blk_tracer __read_mostly = {