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start-stop-daemon can now set process IO scheduling.

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This commit is contained in:
Roy Marples 2009-12-14 08:47:48 +00:00
parent 9476a2e721
commit dc3ccd8101
2 changed files with 39 additions and 3 deletions
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6
man/start-stop-daemon.8
View File

@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd October 14, 2009
.Dd December 14, 2009
.Dt START-STOP-DAEMON 8 SMM
.Os OpenRC
.Sh NAME
@ -136,6 +136,10 @@ option. Only useful when used with daemons that run in the foreground and
forced into the background with the
.Fl -b , -background
option.
.It Fl I , -ionice Ar class Ns Op : Ns Ar data
Modifies the IO scheduling priority of the daemon.
Class can be 0 for none, 1 for real time, 2 for best effort and 3 for idle.
Data can be from 0 to 7 inclusive.
.It Fl N , -nice Ar level
Modifies the scheduling priority of the daemon.
.It Fl 1 , -stdout Ar logfile

36
src/rc/start-stop-daemon.c
View File

@ -47,6 +47,10 @@
#include <sys/time.h>
#include <sys/wait.h>
#ifdef __linux__
#include <sys/syscall.h> /* For io priority */
#endif
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
@ -104,6 +108,13 @@ static char *changeuser, *ch_root, *ch_dir;
extern char **environ;
#ifdef __linux__
static inline int ioprio_set(int which, int who, int ioprio)
{
return syscall(SYS_ioprio_set, which, who, ioprio);
}
#endif
static void
free_schedulelist(void)
{
@ -589,8 +600,9 @@ expand_home(const char *home, const char *path)
}
#include "_usage.h"
#define getoptstring "KN:PR:Sbc:d:e:g:ik:mn:op:s:tu:r:w:x:1:2:" getoptstring_COMMON
#define getoptstring "I:KN:PR:Sbc:d:e:g:ik:mn:op:s:tu:r:w:x:1:2:" getoptstring_COMMON
static const struct option longopts[] = {
{ "ionice", 1, NULL, 'I'},
{ "stop", 0, NULL, 'K'},
{ "nicelevel", 1, NULL, 'N'},
{ "retry", 1, NULL, 'R'},
@ -619,6 +631,7 @@ static const struct option longopts[] = {
longopts_COMMON
};
static const char * const longopts_help[] = {
"Set an ionice class:data when starting",
"Stop daemon",
"Set a nicelevel when starting",
"Retry schedule to use when stopping",
@ -675,7 +688,7 @@ start_stop_daemon(int argc, char **argv)
char *pidfile = NULL;
char *retry = NULL;
int sig = -1;
int nicelevel = 0;
int nicelevel = 0, ionicec = -1, ioniced = 0;
bool background = false;
bool makepidfile = false;
bool interpreted = false;
@ -738,6 +751,17 @@ start_stop_daemon(int argc, char **argv)
while ((opt = getopt_long(argc, argv, getoptstring, longopts,
(int *) 0)) != -1)
switch (opt) {
case 'I': /* --ionice */
if (sscanf(optarg, "%d:%d", &ionicec, &ioniced) == 0)
eerrorx("%s: invalid ionice `%s'",
applet, optarg);
if (ionicec == 0)
ioniced = 0;
else if (ionicec == 3)
ioniced = 7;
ionicec <<= 13; /* class shift */
break;
case 'K': /* --stop */
stop = true;
break;
@ -1121,6 +1145,14 @@ start_stop_daemon(int argc, char **argv)
strerror(errno));
}
/* Only linux suports setting an IO priority */
#ifdef __linux__
if (ionicec != -1 &&
ioprio_set(1, mypid, ionicec | ioniced) == -1)
eerrorx("%s: ioprio_set %d %d: %s", applet,
ionicec, ioniced, strerror(errno));
#endif
if (ch_root && chroot(ch_root) < 0)
eerrorx("%s: chroot `%s': %s",
applet, ch_root, strerror(errno));