commit 0b17309ebe501729960b52c1b69d07f49b79e7c7
author Da Zheng <zhengda@google.com> Wed Jul 27 02:14:28 2011
committer Da Zheng <zhengda@chromium.org> Thu Aug 25 18:00:01 2011
tree c3e767917fb1dc02d5993996047b1b11d1ed2d8e
parent fdc99c49ad91a1db1d023ff28626ae28e700a9e5

bootstat write timing to the kernel.

BUG=chromium-os:19176
TEST=Test it on ChromeOS, and /sys/kernel/debug/bootstat/report contains
all timings written by bootstat.

Change-Id: I25a2e0aec1b24f52047c7bc97f0ad40f78009a8b
Reviewed-on: http://gerrit.chromium.org/gerrit/6598
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Da Zheng <zhengda@chromium.org>

bootstat_log.c

diff --git a/bootstat_log.c b/bootstat_log.c
index a0ba760..2d72c77 100644
--- a/bootstat_log.c
+++ b/bootstat_log.c
@@ -11,6 +11,7 @@
 #include <assert.h>
 #include <stddef.h>
 #include <stdio.h>
+#include <string.h>
 
 #include <sys/fcntl.h>
 #include <sys/param.h>
@@ -18,6 +19,8 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+static const char kBootstageMarkFile[] = "/sys/kernel/debug/bootstage/mark";
+
 //
 // Default path to directory where output statistics will be stored.
 //
@@ -90,9 +93,26 @@
   (void)close(ifd);
 }
 
+static void write_mark(const char *event_name)
+{
+  ssize_t ret __attribute__((unused));
+  int fd = open(kBootstageMarkFile, O_WRONLY);
+
+  if (fd < 0) {
+    return;
+  }
+
+  /*
+   * It's not necessary to check the return value,
+   * but the compiler will generate a warning if we don't.
+   */
+  ret = write(fd, event_name, strlen(event_name));
+  close(fd);
+}
 
 void bootstat_log(const char* event_name)
 {
+  write_mark(event_name);
   append_logdata(uptime_statistics_file_name, "uptime", event_name);
   append_logdata(disk_statistics_file_name, "disk", event_name);
 }