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authorLi Zefan <lizf@cn.fujitsu.com>2009-03-27 10:21:23 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-31 17:28:59 +0200
commitb6a4b0c3ad4c09c1d37b1040ac8e3ebd1016e10b (patch)
tree95025e5a1b49056bdadf9bbb3e96417430d1830a /kernel/trace/blktrace.c
parentad5dd5493a55e462796e42e50a49e76df76fdb05 (diff)
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>
Diffstat (limited to 'kernel/trace/blktrace.c')
-rw-r--r--kernel/trace/blktrace.c62
1 files changed, 30 insertions, 32 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 2f21d776160..c103b0c2002 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -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 = {