Profiler rewview fixes

lib/profiler/README.md

@@ -1,71 +1,52 @@
-# Benchmark
+# Profiler
 
 A simple library to benchmark your code.
 
-## Compiling
-
-- `mkdir build`
-- `cd build`
-- `cmake ..`
-- `make`
-
 ## Usage example
 
 ```c
 #include <stdio.h>
-#include "benchmark.h"
+#define PROFILER
+#include "profiler.h"
 
-int main(int argc, char **argv)
+static void random_func(void)
 {
-    (void) argc;
-    (void) argv;
-
-    /* Create an initate the stopclock */
-    StopClock sclock;
-    sclock_init(&sclock);
-
-    sclock_start(&sclock);
-
-    /* Execute some code */
-
-    sclock_checkpoint(&sclock, "First part");
+	TIME_FUNC_BEGIN();
 
-    /* Execute some more code */
+	/* Your code goes here... */
 
-    sclock_checkpoint(&sclock, "Second part");
-
-    /* Execute even more code */
+	TIME_FUNC_END();
+}
 
-    sclock_checkpoint(&sclock, "Third part");
+int main(int argc, char **argv)
+{
+	PROFILER_SETUP();
+    (void) argc;
+    (void) argv;
 
-    /* Stop the clock */
-    sclock_stop(&sclock);
+	random_func();
 
-    /* Output the results */
-    sclock_print(&sclock, stdout);
+	TIME_BLOCK_BEGIN(block_name);
+	/* Your code goes here */
+	TIME_BLOCK_END(block_name);
 
-    /* Clean up */
-    sclock_destroy(&sclock);
+	PROFILER_STOP(stdout);
 }
 ```
 
 ### Example output
 
-```
-         =====   Benchmarks :   =====
-                 First part : 5916119358   95.54%
-                Second part : 6940092       0.17%
-                 Third part : 265775256     4.29%
-             Remaining time : 3478810       0.00%
+```text
+                      =====   Benchmarks :   =====
+                              Total time : 106691427524 (34.7301 s)
+                   run_game_update[1933] : 20781332     0.02% (2.53% w/children)
+     update_before_particle_engine[1933] : 195193852    0.18%
+      update_after_particle_engine[1933] : 1123800376   1.05%
+            particle_engine_update[1933] : 1354889225   1.27%
 ```
 
 ## How it works
 
 Under the hood `benchmark` is using the `RDTSC` assembly instruction to time
-things. During the `sclock_init` the number of pseudo clocks used in `RDTSC`
-occur in one second (over 300ms). This is a rough estimate but usually aligns
-well with the Ghz number specified on the running computers cpu.
-
-## API
-
-> TODO: Generate API and link to it here
+things. Then there's a bunch of other logic that I don't remember because it's
+been a while since I wrote it.

lib/profiler/include/macros.h

@@ -36,7 +36,7 @@
 #define PROFILER_STOP(fp)
 #define TIME_BLOCK_BEGIN(label)
 #define TIME_BLOCK_END(label)
-#define TIME_BANDWIDTH_BEGIN(label)
+#define TIME_BANDWIDTH_BEGIN(label, bytes)
 #define TIME_BANDWIDTH_END(label)
 #define TIME_FUNC_BEGIN()
 #define TIME_FUNC_END()

lib/profiler/include/repetition_tester.h

@@ -9,7 +9,7 @@
     do { \
         fprintf(stderr, "%s()[%d] %s\n", __func__, __LINE__, msg); \
         tester->mode = TestMode_Error; \
-    } while (0);
+    } while (0)
 
 typedef enum TestMode {
     TestMode_Uninitialized,

lib/profiler/src/calc_cpu_freq.c

@@ -21,7 +21,7 @@ int main(void)
     u64 cpu_elapsed = cpu_end - cpu_start;
     u64 cpu_freq = 0;
     if (os_elapsed) {
-        cpu_freq = os_freq * cpu_elapsed / os_elapsed;
+        cpu_freq = (u64)((double) os_freq * cpu_elapsed / os_elapsed);
     }
 
     printf("    OS Freq: %lu (reported)\n", os_freq);

lib/profiler/src/perf.c

@@ -8,7 +8,7 @@
 
 #include "perf.h"
 
-static int _FD;
+static int _FD = 0;
 
 static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid,
                             int cpu, int group_fd, unsigned long flags)
@@ -24,6 +24,11 @@ void perf_setup(void)
 {
     static struct perf_event_attr pe;
 
+    if (_FD) {
+	    close(_FD);
+	    _FD = 0;
+    }
+
     pe.type = PERF_TYPE_SOFTWARE;
     pe.size = sizeof(pe);
     pe.config = PERF_COUNT_SW_PAGE_FAULTS;
@@ -55,7 +60,10 @@ uint64_t perf_read_page_fault_count(void)
 {
     size_t count = 0;
     if (_FD) {
-        read(_FD, &count, sizeof(count));
+        ssize_t bytes = read(_FD, &count, sizeof(count));
+	if (bytes != sizeof(count)) {
+		count = 0;
+	}
     }
     return count;
 }

lib/profiler/src/rdtsc.c

@@ -1,6 +1,5 @@
-#define PROFILER 1
-
 #include <sys/time.h>
+#include <stdint.h>
 #include "rdtsc.h"
 
 #ifdef __arm__

lib/profiler/src/rep_return_data.c

@@ -46,6 +46,9 @@ static ReturnData variable_create_data(void)
 static ReturnData* malloc_create_data(void)
 {
     ReturnData *data = malloc(sizeof(ReturnData));
+    if (!data) {
+	    return NULL;
+    }
     data->fnum = 1.2;
     data->count = 100;
     data->dnum = 3.4;

src/main.c

@@ -1410,16 +1410,6 @@ void close(void)
 	gWindow = NULL;
 	TTF_Quit();
 	SDL_Quit();
-
-#ifdef PROFILER
-	FILE *fp = fopen("profile.txt", "w");
-	if (fp == NULL) {
-		PROFILER_STOP(stdout);
-	} else {
-		PROFILER_STOP(fp);
-	}
-	fclose(fp);
-#endif
 }
 
 #ifdef CHECKSUM_VALIDATION
@@ -1489,5 +1479,15 @@ int main(int argc, char *argv[])
 	close();
 	PHYSFS_deinit();
 
+#ifdef PROFILER
+	FILE *fp = fopen("profile.txt", "w");
+	if (fp == NULL) {
+		PROFILER_STOP(stdout);
+	} else {
+		PROFILER_STOP(fp);
+		fclose(fp);
+	}
+#endif
+
 	return 0;
 }