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-rw-r--r--src/bootchart/bootchart.c11
-rw-r--r--src/bootchart/store.c29
2 files changed, 19 insertions, 21 deletions
diff --git a/src/bootchart/bootchart.c b/src/bootchart/bootchart.c
index 0ae72c29bb..fc00b4e3f2 100644
--- a/src/bootchart/bootchart.c
+++ b/src/bootchart/bootchart.c
@@ -310,6 +310,7 @@ int main(int argc, char *argv[]) {
time_t t = 0;
int r;
struct rlimit rlim;
+ bool has_procfs = false;
parse_conf();
@@ -349,6 +350,8 @@ int main(int argc, char *argv[]) {
log_uptime();
+ has_procfs = access("/proc/vmstat", F_OK) == 0;
+
LIST_HEAD_INIT(head);
/* main program loop */
@@ -385,11 +388,11 @@ int main(int argc, char *argv[]) {
parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &build, NULL);
}
- /* wait for /proc to become available, discarding samples */
- if (graph_start <= 0.0)
- log_uptime();
- else
+ if (has_procfs)
log_sample(samples, &sampledata);
+ else
+ /* wait for /proc to become available, discarding samples */
+ has_procfs = access("/proc/vmstat", F_OK) == 0;
sample_stop = gettime_ns();
diff --git a/src/bootchart/store.c b/src/bootchart/store.c
index e0719838d5..cedcba88ed 100644
--- a/src/bootchart/store.c
+++ b/src/bootchart/store.c
@@ -57,27 +57,22 @@ double gettime_ns(void) {
return (n.tv_sec + (n.tv_nsec / 1000000000.0));
}
-void log_uptime(void) {
- _cleanup_fclose_ FILE *f = NULL;
- char str[32];
- double uptime;
-
- f = fopen("/proc/uptime", "re");
-
- if (!f)
- return;
- if (!fscanf(f, "%s %*s", str))
- return;
-
- uptime = strtod(str, NULL);
+static double gettime_up(void) {
+ struct timespec n;
- log_start = gettime_ns();
+ clock_gettime(CLOCK_BOOTTIME, &n);
+ return (n.tv_sec + (n.tv_nsec / 1000000000.0));
+}
- /* start graph at kernel boot time */
+void log_uptime(void) {
if (arg_relative)
- graph_start = log_start;
- else
+ graph_start = log_start = gettime_ns();
+ else {
+ double uptime = gettime_up();
+
+ log_start = gettime_ns();
graph_start = log_start - uptime;
+ }
}
static char *bufgetline(char *buf) {