Add rc-analyze

Adds a commandline utility to view various runtime statistics using the event log

Closes: #997

Author: axtloss

man/meson.build

@@ -12,6 +12,7 @@ man3 = [
 man8 = [
   'openrc.8',
   'openrc-run.8',
+  'rc-analyze.8',
   'rc-service.8',
   'rc-status.8',
   'rc-update.8',

man/rc-analyze.8

@@ -0,0 +1,46 @@
+.\" Copyright (c) 2026 The OpenRC Authors.
+.\" See the Authors file at the top-level directory of this distribution and
+.\" https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
+.\"
+.\" This file is part of OpenRC. It is subject to the license terms in
+.\" the LICENSE file found in the top-level directory of this
+.\" distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
+.\" This file may not be copied, modified, propagated, or distributed
+.\"    except according to the terms contained in the LICENSE file.
+.\"
+.Dd April 2, 2026
+.Dt RC-ANALYZE 8 SMM
+.Os OpenRC
+.Sh NAME
+.Nm rc-analyze
+.Nd analyze OpenRC startup performance
+.Sh SYNOPSIS
+.Nm
+.Ar blame | critical-chain | time
+.Sh DESCRIPTION
+The
+.Nm
+utility provides commands to analyze the boot performance of an OpenRC-based
+system.
+.Sh COMMANDS
+The following commands are available:
+.Bl -tag -width ".Fl critical-chain"
+.It Nm blame
+Prints a list of all services that were started, sorted by the time they took
+to start up (longest first). This helps identify the slowest services during
+boot.
+.It Nm critical-chain
+.Op Ar service
+Shows the chain of dependencies that led to the specified
+.Ar service
+starting. If no service is specified, it shows the chain for the last service
+to start in the default runlevel. The output is a tree where each dependency
+is a parent of the service that depends on it. The time at which each service
+became active and the time it took to start are printed.
+.It Nm time
+Prints a summary of the time spent getting to the default runlevel.
+.El
+.Sh SEE ALSO
+.Xr openrc 8 ,
+.Sh AUTHORS
+.An The OpenRC Authors <openrc@lists.gentoo.org>

src/librc/rc-eventlog.c

@@ -52,7 +52,7 @@ static const char *rc_service_state_name(RC_SERVICE state)
  */
 static char *format_timestamp(void)
 {
-	time_t now;
+	struct timespec ts;
 	struct tm *tm;
 	char timebuf[32];
 	char *result;

src/meson.build

@@ -22,6 +22,7 @@ subdir('openrc-user')
 subdir('pam_openrc')
 subdir('poweroff')
 subdir('rc-abort')
+subdir('rc-analyze')
 subdir('rc-depend')
 subdir('rc-service')
 subdir('rc-sstat')

src/rc-analyze/meson.build

@@ -0,0 +1,7 @@
+libm = cc.find_library('m', required: true)
+
+executable('rc-analyze', 'rc-analyze.c',
+  dependencies: [rc, einfo, shared, libm],
+  include_directories: incdir,
+  install: true,
+  install_dir: bindir)