[질문] 아파치 모듈 프로파일링 어떤 게 좋을까요?

HTTPD_2_2_6_HOME=/work/panda005/httpd-2.2.6
 
CC = gcc
 
TARGETS = mod_hello.so
SOURCES = mod_hello.c profile.c
CFLAGS = -g -finstrument-functions -fPIC
INCLUDES = -I$(HTTPD_2_2_6_HOME)/include
 
OBJECTS = $(SOURCES:.c=.o)
LDFLAGS = -g -finstrument-functions -shared -fPIC
LIBS =
LDADD = -lrt
 
all: $(TARGETS)
 
mod_hello.so: $(OBJECTS)
    $(CC) $(LDFLAGS) $(LIBS) $(LDADD) -o $@ $(OBJECTS)
 
install: all
    cp -pf $(TARGETS) $(HTTPD_2_2_6_HOME)/modules/
 
clean:
    -rm -f core* $(OBJECTS) $(TARGETS)
 
.SUFFIXES: .c
.c.o:
    $(CC) $(CFLAGS) $(INCLUDES) -c $<

#include <string.h>
#include <time.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
 
 
void __cyg_profile_func_enter(void *this_fn, void *call_site) __attribute__((no_instrument_function));
void __cyg_profile_func_exit(void *this_fn, void *call_site) __attribute__((no_instrument_function));
 
 
int call_level = 0;
void *last_fn;
 
struct timespec t_start;
clockid_t clock_id;
 
int
f_init ()
{
    int ret;
 
    ret = clock_getcpuclockid (getpid (), &clock_id);
    if (ret < 0)
        return -1;
 
    {
        FILE *fp = fopen ("/tmp/1.log", "a");
        fprintf (fp, "f_init: %d\n", clock_id);
        fclose (fp);
    }
 
    return 0;
}
 
void
__cyg_profile_func_enter (void *this_fn, void *call_site)
{
    if (this_fn != last_fn)
        ++ call_level;
 
    clock_gettime (clock_id, &t_start);
    {
        FILE *fp = fopen ("/tmp/1.log", "a");
        fprintf (fp, "%p[%d]: %lu.%lu start\n", this_fn, call_level, t_start.tv_sec, t_start.tv_nsec);
        fclose (fp);
    }
 
    (void) call_site;
    last_fn = this_fn;
 
    return;
}
 
 
void
__cyg_profile_func_exit (void *this_fn, void *call_site)
{
    struct timespec t_end;
 
    clock_gettime (clock_id, &t_end);
 
    {
        FILE *fp = fopen ("/tmp/1.log", "a");
        fprintf (fp, "%p[%d]: %lu.%lu exit\n", this_fn, call_level, t_end.tv_sec, t_end.tv_nsec);
        fclose (fp);
    }
 
    -- call_level;
 
    (void) call_site;
 
    return;
}

#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
 
int
inc (int i)
{
    return ++ i;
}
 
int
dec (int i)
{
    return -- i;
}
 
/* The sample content handler */
int hello_handler(request_rec *r)
{
    f_init ();
 
    if (strcmp(r->handler, "hello")) {
        return DECLINED;
    }
    r->content_type = "text/html";
 
    inc (0);
    dec (0);
    if (!r->header_only)
        ap_rputs("The sample page from mod_hello.c\n", r);
    return OK;
}
 
 
void hello_register_hooks(apr_pool_t *p)
{
    ap_hook_handler (hello_handler, NULL, NULL, APR_HOOK_MIDDLE);
}
 
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA hello_module = {
    STANDARD20_MODULE_STUFF,
    NULL,                  /* create per-dir    config structures */
    NULL,                  /* merge  per-dir    config structures */
    NULL,                  /* create per-server config structures */
    NULL,                  /* merge  per-server config structures */
    NULL,                  /* table of config file commands       */
    hello_register_hooks  /* register hooks                      */
};

LoadModule hello_module modules/mod_hello.so
<Location /hello>
    SetHandler  hello
</Location>