4 files changed, 193 insertions, 10 deletions

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 07d92c11b5d8..2281b5098e95 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -30,6 +30,20 @@ config BLK_DEV_MD
 
           If unsure, say N.
 
+config MD_AUTODETECT
+        bool "Autodetect RAID arrays during kernel boot"
+        depends on BLK_DEV_MD=y
+        default y
+        ---help---
+          If you say Y here, then the kernel will try to autodetect raid
+          arrays as part of its boot process. 
+
+          If you don't use raid and say Y, this autodetection can cause 
+          a several-second delay in the boot time due to various
+          synchronisation steps that are part of this step.
+
+          If unsure, say Y.
+
 config MD_LINEAR
         tristate "Linear (append) mode"
         depends on BLK_DEV_MD
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index 693d24694a6c..48b3fadd83ed 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -12,7 +12,12 @@
  * The code for that is here.
  */
 
-static int __initdata raid_noautodetect, raid_autopart;
+#ifdef CONFIG_MD_AUTODETECT
+static int __initdata raid_noautodetect;
+#else
+static int __initdata raid_noautodetect=1;
+#endif
+static int __initdata raid_autopart;
 
 static struct {
         int minor;
@@ -252,6 +257,8 @@ static int __init raid_setup(char *str)
 
                 if (!strncmp(str, "noautodetect", wlen))
                         raid_noautodetect = 1;
+                if (!strncmp(str, "autodetect", wlen))
+                        raid_noautodetect = 0;
                 if (strncmp(str, "partitionable", wlen)==0)
                         raid_autopart = 1;
                 if (strncmp(str, "part", wlen)==0)
@@ -264,17 +271,32 @@ static int __init raid_setup(char *str)
 __setup("raid=", raid_setup);
 __setup("md=", md_setup);
 
+static void autodetect_raid(void)
+{
+        int fd;
+
+        /*
+         * Since we don't want to detect and use half a raid array, we need to
+         * wait for the known devices to complete their probing
+         */
+        printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
+        printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
+        while (driver_probe_done() < 0)
+                msleep(100);
+        fd = sys_open("/dev/md0", 0, 0);
+        if (fd >= 0) {
+                sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
+                sys_close(fd);
+        }
+}
+
 void __init md_run_setup(void)
 {
         create_dev("/dev/md0", MKDEV(MD_MAJOR, 0));
+
         if (raid_noautodetect)
-                printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=noautodetect)\n");
-        else {
-                int fd = sys_open("/dev/md0", 0, 0);
-                if (fd >= 0) {
-                        sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
-                        sys_close(fd);
-                }
-        }
+                printk(KERN_INFO "md: Skipping autodetection of RAID arrays. (raid=autodetect will force)\n");
+        else
+                autodetect_raid();
         md_setup_drive();
 }
diff --git a/init/main.c b/init/main.c
index 3820323c4c84..27f6bf6108e9 100644
--- a/init/main.c
+++ b/init/main.c
@@ -708,7 +708,7 @@ int do_one_initcall(initcall_t fn)
         int result;
 
         if (initcall_debug) {
-                printk("calling  %pF\n", fn);
+                printk("calling  %pF @ %i\n", fn, task_pid_nr(current));
                 t0 = ktime_get();
         }
 
diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
new file mode 100644
index 000000000000..2243353fe55d
--- /dev/null
+++ b/scripts/bootgraph.pl
@@ -0,0 +1,147 @@
+#!/usr/bin/perl
+
+# Copyright 2008, Intel Corporation
+#
+# This file is part of the Linux kernel
+#
+# This program file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program in a file named COPYING; if not, write to the
+# Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301 USA
+#
+# Authors:
+#       Arjan van de Ven <arjan@linux.intel.com>
+
+
+#
+# This script turns a dmesg output into a SVG graphic that shows which
+# functions take how much time. You can view SVG graphics with various
+# programs, including Inkscape, The Gimp and Firefox.
+#
+#
+# For this script to work, the kernel needs to be compiled with the
+# CONFIG_PRINTK_TIME configuration option enabled, and with
+# "initcall_debug" passed on the kernel command line.
+#
+# usage:
+#       dmesg | perl scripts/bootgraph.pl > output.svg
+#
+
+my @rows;
+my %start, %end, %row;
+my $done = 0;
+my $rowcount = 0;
+my $maxtime = 0;
+my $firsttime = 100;
+my $count = 0;
+while (<>) {
+        my $line = $_;
+        if ($line =~ /([0-9\.]+)\] calling  ([a-zA-Z0-9\_]+)\+/) {
+                my $func = $2;
+                if ($done == 0) {
+                        $start{$func} = $1;
+                        if ($1 < $firsttime) {
+                                $firsttime = $1;
+                        }
+                }
+                $row{$func} = 1;
+                if ($line =~ /\@ ([0-9]+)/) {
+                        my $pid = $1;
+                        if (!defined($rows[$pid])) {
+                                $rowcount = $rowcount + 1;
+                                $rows[$pid] = $rowcount;
+                        }
+                        $row{$func} = $rows[$pid];
+                }
+                $count = $count + 1;
+        }
+
+        if ($line =~ /([0-9\.]+)\] initcall ([a-zA-Z0-9\_]+)\+.*returned/) {
+                if ($done == 0) {
+                        $end{$2} = $1;
+                        $maxtime = $1;
+                }
+        }
+        if ($line =~ /Write protecting the/) {
+                $done = 1;
+        }
+        if ($line =~ /Freeing unused kernel memory/) {
+                $done = 1;
+        }
+}
+
+if ($count == 0) {
+        print "No data found in the dmesg. Make sure that 'printk.time=1' and\n";
+        print "'initcall_debug' are passed on the kernel command line.\n\n";
+        print "Usage: \n";
+        print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
+        exit;
+}
+
+print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
+print "<svg width=\"1000\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n";
+
+my @styles;
+
+$styles[0] = "fill:rgb(0,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[1] = "fill:rgb(0,255,0);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[2] = "fill:rgb(255,0,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[3] = "fill:rgb(255,255,20);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[4] = "fill:rgb(255,0,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[5] = "fill:rgb(0,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[6] = "fill:rgb(0,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[7] = "fill:rgb(0,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[8] = "fill:rgb(255,0,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[9] = "fill:rgb(255,255,128);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[10] = "fill:rgb(255,128,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+$styles[11] = "fill:rgb(128,255,255);fill-opacity:0.5;stroke-width:1;stroke:rgb(0,0,0)";
+
+my $mult = 950.0 / ($maxtime - $firsttime);
+my $threshold = ($maxtime - $firsttime) / 60.0;
+my $stylecounter = 0;
+while (($key,$value) = each %start) {
+        my $duration = $end{$key} - $start{$key};
+
+        if ($duration >= $threshold) {
+                my $s, $s2, $e, $y;
+                $s = ($value - $firsttime) * $mult;
+                $s2 = $s + 6;
+                $e = ($end{$key} - $firsttime) * $mult;
+                $w = $e - $s;
+
+                $y = $row{$key} * 150;
+                $y2 = $y + 4;
+
+                $style = $styles[$stylecounter];
+                $stylecounter = $stylecounter + 1;
+                if ($stylecounter > 11) {
+                        $stylecounter = 0;
+                };
+
+                print "<rect x=\"$s\" width=\"$w\" y=\"$y\" height=\"145\" style=\"$style\"/>\n";
+                print "<text transform=\"translate($s2,$y2) rotate(90)\">$key</text>\n";
+        }
+}
+
+
+# print the time line on top
+my $time = $firsttime;
+my $step = ($maxtime - $firsttime) / 15;
+while ($time < $maxtime) {
+        my $s2 = ($time - $firsttime) * $mult;
+        my $tm = int($time * 100) / 100.0;
+        print "<text transform=\"translate($s2,89) rotate(90)\">$tm</text>\n";
+        $time = $time + $step;
+}
+
+print "</svg>\n";