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MINOR: trace: don't call strlen() on the function's name

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Currently there's a small mistake in the way the trace function and
macros. The calling function name is known as a constant until the
macro and passed as-is to the __trace() function. That one needs to
know its length and will call ist() on it, resulting in a real call
to strlen() while that length was known before the call. Let's use
an ist instead of a const char* for __trace() and __trace_enabled()
so that we can now completely avoid calling strlen() during this
operation. This has significantly reduced the importance of
__trace_enabled() in perf top.
This commit is contained in:
Willy Tarreau 2025-09-18 08:26:50 +02:00
parent 06fa9f717f
commit 361c227465
2 changed files with 18 additions and 19 deletions
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28
include/haproxy/trace.h
View File

@ -79,37 +79,37 @@
* TRACE_ENABLED() reports whether or not trace is enabled for the current
* source, level, mask and arguments.
*/
#define TRACE_ENABLED(level, mask, args...) (_trace_enabled((level), (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, ##args))
#define TRACE_ENABLED(level, mask, args...) (_trace_enabled((level), (mask), TRACE_SOURCE, ist(TRC_LOC), ist(__FUNCTION__), ##args))
#define TRACE(msg, mask, args...) \
_trace(TRACE_LEVEL, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_ERROR(msg, mask, args...) \
_trace(TRACE_LEVEL_ERROR, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_ERROR, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_USER(msg, mask, args...) \
_trace(TRACE_LEVEL_USER, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_USER, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_DATA(msg, mask, args...) \
_trace(TRACE_LEVEL_DATA, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_DATA, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_PROTO(msg, mask, args...) \
_trace(TRACE_LEVEL_PROTO, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_PROTO, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_STATE(msg, mask, args...) \
_trace(TRACE_LEVEL_STATE, (mask), TRACE_SOURCE, ist(TRC_LOC), NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_STATE, (mask), TRACE_SOURCE, ist(TRC_LOC), IST_NULL, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_DEVEL(msg, mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), ist(__FUNCTION__), TRC_5ARGS(0,##args,0,0,0,0,0), ist(msg))
#define TRACE_ENTER(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("entering"))
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), ist(__FUNCTION__), TRC_5ARGS(0,##args,0,0,0,0,0), ist("entering"))
#define TRACE_LEAVE(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("leaving"))
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), ist(__FUNCTION__), TRC_5ARGS(0,##args,0,0,0,0,0), ist("leaving"))
#define TRACE_POINT(mask, args...) \
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), __FUNCTION__, TRC_5ARGS(0,##args,0,0,0,0,0), ist("in"))
_trace(TRACE_LEVEL_DEVELOPER, (mask), TRACE_SOURCE, ist(TRC_LOC), ist(__FUNCTION__), TRC_5ARGS(0,##args,0,0,0,0,0), ist("in"))
/* This produces a printf-like trace at level <level> for event mask <mask> and
* trace arguments <a1..a4>. All args mandatory, but may be zero. No output
@ -135,7 +135,7 @@
if (_msg_len >= sizeof(_msg)) \
_msg_len = sizeof(_msg) - 1; \
_trace((level), (mask), TRACE_SOURCE, \
trc_loc, func, a1, a2, a3, a4, \
trc_loc, ist(func), a1, a2, a3, a4, \
&trace_no_cb, ist2(_msg, _msg_len)); \
} \
} while (0)
@ -172,12 +172,12 @@ extern struct list trace_sources;
extern THREAD_LOCAL struct buffer trace_buf;
int __trace_enabled(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const struct ist where, const struct ist ist_func,
const void *a1, const void *a2, const void *a3, const void *a4,
const void **plockptr);
void __trace(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const struct ist where, const struct ist ist_func,
const void *a1, const void *a2, const void *a3, const void *a4,
void (*cb)(enum trace_level level, uint64_t mask, const struct trace_source *src,
const struct ist where, const struct ist func,

7
src/trace.c
View File

@ -87,7 +87,7 @@ static inline const void *trace_pick_arg(uint32_t arg_def, const void *a1, const
* and check if the result is >0.
*/
int __trace_enabled(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const struct ist where, const struct ist ist_func,
const void *a1, const void *a2, const void *a3, const void *a4,
const void **plockptr)
{
@ -252,7 +252,7 @@ int __trace_enabled(enum trace_level level, uint64_t mask, struct trace_source *
/* write a message for the given trace source */
void __trace(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist where, const char *func,
const struct ist where, const struct ist ist_func,
const void *a1, const void *a2, const void *a3, const void *a4,
void (*cb)(enum trace_level level, uint64_t mask, const struct trace_source *src,
const struct ist where, const struct ist func,
@ -260,14 +260,13 @@ void __trace(enum trace_level level, uint64_t mask, struct trace_source *src,
const struct ist msg)
{
const void *lockon_ptr;
struct ist ist_func = ist(func);
char tnum[4];
struct ist line[12];
int words = 0;
int ret;
lockon_ptr = NULL;
ret = __trace_enabled(level, mask, src, where, func, a1, a2, a3, a4, &lockon_ptr);
ret = __trace_enabled(level, mask, src, where, ist_func, a1, a2, a3, a4, &lockon_ptr);
if (lockon_ptr)
HA_ATOMIC_STORE(&src->lockon_ptr, lockon_ptr);