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tools/vm/page_owner_sort: free memory before exit

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Although when a process terminates, the kernel will removes memory
associated with that process, It's neither good style nor proper design to
leave it to kernel.  This patch free allocated memory before process exit.

Link: https://lkml.kernel.org/r/20221219164917.14132-1-iecedge@gmail.com
Signed-off-by: Jianlin Lv <iecedge@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jianlin Lv 2022-12-19 16:49:17 +00:00 committed by Andrew Morton
parent 44383cef54
commit ef1faf0e37
1 changed files with 45 additions and 20 deletions
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65
tools/vm/page_owner_sort.c
View file

@ -246,15 +246,16 @@ static int search_pattern(regex_t *pattern, char *pattern_str, char *buf)
return 0;
}
static void check_regcomp(regex_t *pattern, const char *regex)
static bool check_regcomp(regex_t *pattern, const char *regex)
{
int err;
err = regcomp(pattern, regex, REG_EXTENDED | REG_NEWLINE);
if (err != 0 || pattern->re_nsub != 1) {
fprintf(stderr, "Invalid pattern %s code %d\n", regex, err);
exit(1);
return false;
}
return true;
}
static char **explode(char sep, const char *str, int *size)
@ -494,28 +495,28 @@ static bool is_need(char *buf)
return true;
}
static void add_list(char *buf, int len, char *ext_buf)
static bool add_list(char *buf, int len, char *ext_buf)
{
if (list_size != 0 &&
len == list[list_size-1].len &&
memcmp(buf, list[list_size-1].txt, len) == 0) {
list[list_size-1].num++;
list[list_size-1].page_num += get_page_num(buf);
return;
return true;
}
if (list_size == max_size) {
fprintf(stderr, "max_size too small??\n");
exit(1);
return false;
}
if (!is_need(buf))
return;
return true;
list[list_size].pid = get_pid(buf);
list[list_size].tgid = get_tgid(buf);
list[list_size].comm = get_comm(buf);
list[list_size].txt = malloc(len+1);
if (!list[list_size].txt) {
fprintf(stderr, "Out of memory\n");
exit(1);
return false;
}
memcpy(list[list_size].txt, buf, len);
list[list_size].txt[len] = 0;
@ -534,6 +535,7 @@ static void add_list(char *buf, int len, char *ext_buf)
printf("loaded %d\r", list_size);
fflush(stdout);
}
return true;
}
static bool parse_cull_args(const char *arg_str)
@ -790,12 +792,19 @@ int main(int argc, char **argv)
exit(1);
}
check_regcomp(&order_pattern, "order\\s*([0-9]*),");
check_regcomp(&pid_pattern, "pid\\s*([0-9]*),");
check_regcomp(&tgid_pattern, "tgid\\s*([0-9]*) ");
check_regcomp(&comm_pattern, "tgid\\s*[0-9]*\\s*\\((.*)\\),\\s*ts");
check_regcomp(&ts_nsec_pattern, "ts\\s*([0-9]*)\\s*ns,");
check_regcomp(&free_ts_nsec_pattern, "free_ts\\s*([0-9]*)\\s*ns");
if (!check_regcomp(&order_pattern, "order\\s*([0-9]*),"))
goto out_order;
if (!check_regcomp(&pid_pattern, "pid\\s*([0-9]*),"))
goto out_pid;
if (!check_regcomp(&tgid_pattern, "tgid\\s*([0-9]*) "))
goto out_tgid;
if (!check_regcomp(&comm_pattern, "tgid\\s*[0-9]*\\s*\\((.*)\\),\\s*ts"))
goto out_comm;
if (!check_regcomp(&ts_nsec_pattern, "ts\\s*([0-9]*)\\s*ns,"))
goto out_ts;
if (!check_regcomp(&free_ts_nsec_pattern, "free_ts\\s*([0-9]*)\\s*ns"))
goto out_free_ts;
fstat(fileno(fin), &st);
max_size = st.st_size / 100; /* hack ... */
@ -804,7 +813,7 @@ int main(int argc, char **argv)
ext_buf = malloc(BUF_SIZE);
if (!list || !buf || !ext_buf) {
fprintf(stderr, "Out of memory\n");
exit(1);
goto out_free;
}
for ( ; ; ) {
@ -812,7 +821,8 @@ int main(int argc, char **argv)
if (buf_len < 0)
break;
add_list(buf, buf_len, ext_buf);
if (!add_list(buf, buf_len, ext_buf))
goto out_free;
}
printf("loaded %d\n", list_size);
@ -862,11 +872,26 @@ int main(int argc, char **argv)
fprintf(fout, "\n");
}
}
regfree(&order_pattern);
regfree(&pid_pattern);
regfree(&tgid_pattern);
regfree(&comm_pattern);
regfree(&ts_nsec_pattern);
out_free:
if (ext_buf)
free(ext_buf);
if (buf)
free(buf);
if (list)
free(list);
out_free_ts:
regfree(&free_ts_nsec_pattern);
out_ts:
regfree(&ts_nsec_pattern);
out_comm:
regfree(&comm_pattern);
out_tgid:
regfree(&tgid_pattern);
out_pid:
regfree(&pid_pattern);
out_order:
regfree(&order_pattern);
return 0;
}