sched_rr_get_interval − get the SCHED_RR interval for the named process
int sched_rr_get_interval(pid_t pid, struct timespec * tp);
sched_rr_get_interval() writes into the timespec structure pointed to by tp the round-robin time quantum for the process identified by pid. The specified process should be running under the SCHED_RR scheduling policy.
The timespec structure has the following form:
time_t tv_sec; /* seconds */
long tv_nsec; /* nanoseconds */
If pid is zero, the time quantum for the calling process is written into *tp.
On success, sched_rr_get_interval() returns 0. On error, −1 is returned, and errno is set appropriately.
Problem with copying information to user space.
The system call is not yet implemented (only on rather old kernels).
Could not find a process with the ID pid.
POSIX systems on which sched_rr_get_interval() is available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
POSIX does not specify any mechanism for controlling the size of the round-robin time quantum. Older Linux kernels provide a (nonportable) method of doing this. The quantum can be controlled by adjusting the process’s nice value (see setpriority(2)). Assigning a negative (i.e., high) nice value results in a longer quantum; assigning a positive (i.e., low) nice value results in a shorter quantum. The default quantum is 0.1 seconds; the degree to which changing the nice value affects the quantum has varied somewhat across kernel versions. This method of adjusting the quantum was removed starting with Linux 2.6.24.
Linux 3.9 added a new mechanism for adjusting (and viewing) the SCHED_RR quantum: the /proc/sys/kernel/sched_rr_timeslice_ms file exposes the quantum as a millisecond value, whose default is 100. Writing 0 to this file resets the quantum to the default value.
This page is part of release 3.69 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man−pages/.
More Linux Commands
idn.conf.5 - idn.conf(5) - configuration files for idnkit library........
idn.conf and .idnrc are configuration files for idnkit library which is a toolkit for handling internationalized domain names. idnkit library tries to load the
eview(1) - easy Vim, edit a file with Vim and setup for mode
eVim starts Vim and sets options to make it behave like a modeless editor. This is still Vim but used as a point-and-click editor. This feels a lot like using N
tcpdump(1) - dump traffic on a network - Linux manual page
Tcpdump prints out a description of the contents of packets on a network interface that match the boolean expression. It can also be run with the -w flag, which
nss-myhostname(8) Provide hostname resolution for the locall
nss-myhostname is a plugin for the GNU Name Service Switch (NSS) functionality of the GNU C Library (glibc) providing hostname resolution for the locally config
lvmdiskscan(8) - scan for all devices visible to LVM2.......
lvmdiskscan scans all SCSI, (E)IDE disks, multiple devices and a bunch of other block devices in the system looking for LVM physical volumes. The size reported
XQueryPointer(3) - get pointer coordinates - Linux man page
The XQueryPointer function returns the root window the pointer is logically on and the pointer coordinates relative to the root windows origin. If XQueryPointer
menu_value(3menu) - set and get menu item values (Man Page)
If you turn off the menu option O_ONEVALUE (e.g., with set_menu_opts or menu_opts_off; see opts(3MENU)), the menu becomes multi-valued; that is, more than one i
log2(3) - base-2 logarithmic function - Linux manual page...
The log2() function returns the base 2 logarithm of x. RETURN VALUE On success, these functions return the base 2 logarithm of x. For special cases, including w
agetty(8) - alternative Linux getty - Linux manual page.....
agetty opens a tty port, prompts for a login name and invokes the /bin/login command. It is normally invoked by init(8). agetty has several non-standard feature
xinetd.conf(5) - Extended Internet Services Daemon configura
xinetd.conf is the configuration file that determines the services provided by xinetd. Any line whose first non-white-space character is a # is considered a com
if_indextoname(3) mappings between network interface names a
The if_nametoindex() function returns the index of the network interface corresponding to the name ifname. The if_indextoname() function returns the name of the
rmid(1) - The Java RMI Activation System Daemon (Man Page)
The rmid tool starts the activation system daemon. The activation system daemon must be started before activatable objects can be either registered with the act