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target: enhance target profiling 

1. gprof uses 2-bytes as minimum bucket size.
2. As user wants to use gprof --sum to summarize multiple
   profiling data files, the range MUST be the same.
   Add new arguments to specify profiling range.

Change-Id: Ie7e6afa6a4d82250e2d194a0eed2b428c1479ea1
Signed-off-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-on: http://openocd.zylin.com/1572
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Hsiangkai Wang 2013-08-14 14:46:58 +08:00 committed by Spencer Oliver
parent 2803fa3822
commit 6d86ded4db
1 changed files with 40 additions and 16 deletions
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56
src/target/target.c
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@ -3426,8 +3426,11 @@ static void writeString(FILE *f, char *s)
writeData(f, s, strlen(s));
}
typedef unsigned char UNIT[2]; /* unit of profiling */
/* Dump a gmon.out histogram file. */
static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filename)
static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filename,
bool with_range, uint32_t start_address, uint32_t end_address)
{
uint32_t i;
FILE *f = fopen(filename, "w");
@ -3443,18 +3446,25 @@ static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filena
writeData(f, &zero, 1);
/* figure out bucket size */
uint32_t min = samples[0];
uint32_t max = samples[0];
for (i = 0; i < sampleNum; i++) {
if (min > samples[i])
min = samples[i];
if (max < samples[i])
max = samples[i];
}
uint32_t min;
uint32_t max;
if (with_range) {
min = start_address;
max = end_address;
} else {
min = samples[0];
max = samples[0];
for (i = 0; i < sampleNum; i++) {
if (min > samples[i])
min = samples[i];
if (max < samples[i])
max = samples[i];
}
/* max should be (largest sample + 1)
* Refer to binutils/gprof/hist.c (find_histogram_for_pc) */
max++;
/* max should be (largest sample + 1)
* Refer to binutils/gprof/hist.c (find_histogram_for_pc) */
max++;
}
int addressSpace = max - min;
assert(addressSpace >= 2);
@ -3462,7 +3472,7 @@ static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filena
/* FIXME: What is the reasonable number of buckets?
* The profiling result will be more accurate if there are enough buckets. */
static const uint32_t maxBuckets = 128 * 1024; /* maximum buckets. */
uint32_t numBuckets = addressSpace;
uint32_t numBuckets = addressSpace / sizeof(UNIT);
if (numBuckets > maxBuckets)
numBuckets = maxBuckets;
int *buckets = malloc(sizeof(int) * numBuckets);
@ -3473,6 +3483,10 @@ static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filena
memset(buckets, 0, sizeof(int) * numBuckets);
for (i = 0; i < sampleNum; i++) {
uint32_t address = samples[i];
if ((address < min) || (max <= address))
continue;
long long a = address - min;
long long b = numBuckets;
long long c = addressSpace;
@ -3517,7 +3531,7 @@ COMMAND_HANDLER(handle_profile_command)
{
struct target *target = get_current_target(CMD_CTX);
if (CMD_ARGC != 2)
if ((CMD_ARGC != 2) && (CMD_ARGC != 4))
return ERROR_COMMAND_SYNTAX_ERROR;
const uint32_t MAX_PROFILE_SAMPLE_NUM = 10000;
@ -3565,7 +3579,17 @@ COMMAND_HANDLER(handle_profile_command)
return retval;
}
write_gmon(samples, num_of_sampels, CMD_ARGV[1]);
uint32_t start_address = 0;
uint32_t end_address = 0;
bool with_range = false;
if (CMD_ARGC == 4) {
with_range = true;
COMMAND_PARSE_NUMBER(uint, CMD_ARGV[2], start_address);
COMMAND_PARSE_NUMBER(uint, CMD_ARGV[3], end_address);
}
write_gmon(samples, num_of_sampels, CMD_ARGV[1],
with_range, start_address, end_address);
command_print(CMD_CTX, "Wrote %s", CMD_ARGV[1]);
free(samples);
@ -5563,7 +5587,7 @@ static const struct command_registration target_exec_command_handlers[] = {
.name = "profile",
.handler = handle_profile_command,
.mode = COMMAND_EXEC,
.usage = "seconds filename",
.usage = "seconds filename [start end]",
.help = "profiling samples the CPU PC",
},
/** @todo don't register virt2phys() unless target supports it */