From: Dongwoo Lee <dwoo08.lee@samsung.com>
Date: Thu, 12 May 2022 05:44:33 +0000 (+0900)
Subject: util: kernel: Add functions for getting process smaps file
X-Git-Tag: submit/tizen/20220623.085905~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b9f08a7f088b274b8018d7ac34b2f74a45dcad9e;p=platform%2Fcore%2Fsystem%2Fpass.git

util: kernel: Add functions for getting process smaps file

Change-Id: Id8b9d677585ccc4381c33eb53373037c64540f59
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>
---

diff --git a/include/util/kernel.h b/include/util/kernel.h
index 5938d9f..c640bd5 100644
--- a/include/util/kernel.h
+++ b/include/util/kernel.h
@@ -35,6 +35,13 @@ struct cpu_stat {
 	int64_t soft_irq;
 };
 
+struct proc_map_info {
+	uint32_t rss;
+	uint32_t pss;
+	uint32_t swap;
+	uint32_t swap_pss;
+};
+
 enum {
 	PROCESS_STAT_FIELD_PID,
 	PROCESS_STAT_FIELD_COMM,
@@ -58,4 +65,5 @@ int kernel_get_process_stat_fields(pid_t pid, char *buffer, int buf_len,
 				   char *stat_fields[PROCESS_STAT_FIELD_MAX]);
 int kernel_get_process_taskstats(struct taskstats *stats, int cmd_type, pid_t pid);
 int kernel_get_thread_group_taskstats(struct taskstats *stats, pid_t tgid, bool get_proc_info);
+int kernel_get_thread_group_map_info(struct proc_map_info *map_info, pid_t tgid);
 #endif
diff --git a/src/util/kernel.c b/src/util/kernel.c
index 653b297..2101535 100644
--- a/src/util/kernel.c
+++ b/src/util/kernel.c
@@ -27,6 +27,8 @@
 #include <util/log.h>
 #include <util/kernel.h>
 
+static int have_smaps_rollup;
+
 static int __get_cpu_num(char *path)
 {
 	FILE *fp;
@@ -407,3 +409,44 @@ int kernel_get_thread_group_taskstats(struct taskstats *stats, pid_t tgid, bool
 
 	return 0;
 }
+
+int kernel_get_thread_group_map_info(struct proc_map_info *map_info, pid_t tgid)
+{
+	char smap_file_path[BUFF_MAX];
+	char buffer[BUFF_MAX];
+	FILE *smaps_file;
+
+	sprintf(smap_file_path,	"/proc/%d/%s", tgid, have_smaps_rollup ? "smaps_rollup" : "smaps");
+
+	smaps_file = fopen(smap_file_path, "r");
+	if (!smaps_file)
+		return -EIO;
+
+	map_info->rss = 0;
+	map_info->pss = 0;
+	map_info->swap = 0;
+	map_info->swap_pss = 0;
+
+	while (fgets(buffer, sizeof(buffer), smaps_file)) {
+		if (strchr(buffer, '\n') == 0)
+			continue;
+
+		if (strstr(buffer, "Rss:"))
+			map_info->rss += strtol(buffer + 4, NULL, 10);
+		else if (strstr(buffer, "Pss:"))
+			map_info->pss += strtol(buffer + 4, NULL, 10);
+		else if (strstr(buffer, "Swap:"))
+			map_info->swap += strtol(buffer + 5, NULL, 10);
+		else if (strstr(buffer, "SwapPss:"))
+			map_info->swap_pss += strtol(buffer + 8, NULL, 10);
+	}
+
+	fclose(smaps_file);
+
+	return 0;
+}
+
+static void __CONSTRUCTOR__ kernel_init(void)
+{
+	have_smaps_rollup = !access("/proc/self/smaps_rollup", R_OK);
+}