diff --git a/pidof.1 b/pidof.1

index 8ef4abf..5f95b85 100644

--- a/pidof.1

+++ b/pidof.1

@@ -45,6 +45,9 @@ the current root directory of processes they do not own.

 .IP \-x

 Scripts too - this causes the program to also return process id's of

 shells running the named scripts.

+.IP \-w

+Show also processes that do not have visible command line (e.g. kernel

+worker threads).

 .IP "-o \fIomitpid\fP"

 Tells \fIpidof\fP to omit processes with that process id. The special

 pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP

diff --git a/pidof.c b/pidof.c

index 90ecb13..0754754 100644

--- a/pidof.c

+++ b/pidof.c

@@ -55,6 +55,8 @@ static char *program = NULL;

 static int opt_single_shot    = 0;  /* -s */

 static int opt_scripts_too    = 0;  /* -x */

 static int opt_rootdir_check  = 0;  /* -c */

+static int opt_with_workers   = 0;  /* -w */

+

 static char *pidof_root = NULL;

@@ -69,6 +71,7 @@ static int __attribute__ ((__noreturn__)) usage(int opt)

 	fputs(_(" -s, --single-shot         return one PID only\n"), fp);

 	fputs(_(" -c, --check-root          omit processes with different root\n"), fp);

 	fputs(_(" -x                        also find shells running the named scripts\n"), fp);

+	fputs(_(" -w, --with-workers        show kernel workers too\n"), fp);

 	fputs(_(" -o, --omit-pid <PID,...>  omit processes with PID\n"), fp);

 	fputs(_(" -S, --separator SEP       use SEP as separator put between PIDs"), fp);

 	fputs(USAGE_SEPARATOR, fp);

@@ -142,7 +145,6 @@ static void select_procs (void)

 	static int size = 0;

 	char *cmd_arg0, *cmd_arg0base;

 	char *cmd_arg1, *cmd_arg1base;

-	char *stat_cmd;

 	char *program_base;

 	char *root_link;

 	char *exe_link;

@@ -168,10 +170,9 @@ static void select_procs (void)

 			}

 		}

-		if (!is_omitted(task.XXXID)) {

+		if (!is_omitted(task.XXXID) && ((task.cmdline && *task.cmdline) || opt_with_workers)) {

 			cmd_arg0 = (task.cmdline && *task.cmdline) ? *task.cmdline : "\0";

-			stat_cmd = task.cmd ? task.cmd : "\0";

 			/* processes starting with '-' are login shells */

 			if (*cmd_arg0 == '-') {

@@ -193,7 +194,7 @@ static void select_procs (void)

 			    !strcmp(program_base, cmd_arg0) ||

 			    !strcmp(program, cmd_arg0) ||

-			    !strcmp(program, stat_cmd) ||

+			    (opt_with_workers && !strcmp(program, task.cmd)) ||

 			    !strcmp(program, exe_link_base) ||

 			    !strcmp(program, exe_link))

@@ -293,13 +294,14 @@ int main (int argc, char **argv)

 	int first_pid = 1;

 	const char *separator = " ";

-	const char *opts = "scdnxmo:S:?Vh";

+	const char *opts = "scdnxwmo:S:?Vh";

 	static const struct option longopts[] = {

 		{"check-root", no_argument, NULL, 'c'},

 		{"single-shot", no_argument, NULL, 's'},

 		{"omit-pid", required_argument, NULL, 'o'},

 		{"separator", required_argument, NULL, 'S'},

+		{"with-workers", no_argument, NULL, 'w'},

 		{"help", no_argument, NULL, 'h'},

 		{"version", no_argument, NULL, 'V'},

 		{NULL, 0, NULL, 0}

@@ -325,6 +327,9 @@ int main (int argc, char **argv)

 		case 'x':

 			opt_scripts_too = 1;

 			break;

+		case 'w':

+			opt_with_workers = 1;

+			break;

 		case 'c':

 			if (geteuid() == 0) {

 				opt_rootdir_check = 1;

@@ -359,6 +364,8 @@ int main (int argc, char **argv)

 		program = argv[optind++];

+		if (*program == '\0') continue;

+

 		select_procs();	/* get the list of matching processes */

 		if (proc_count) {