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__PPC_SET_PPR_MED(3) LinuxProgrammer's Manual __PPC_SET_PPR_MED(3)
__ppc_set_ppr_med, __ppc_set_ppr_very_low, __ppc_set_ppr_low,
__ppc_set_ppr_med_low, __ppc_set_ppr_med_high - Set the Program
Priority Register
#include <sys/platform/ppc.h>
void __ppc_set_ppr_med(void);
void __ppc_set_ppr_very_low(void);
void __ppc_set_ppr_low(void);
void __ppc_set_ppr_med_low(void);
void __ppc_set_ppr_med_high(void);
These functions provide access to the Program Priority Register
(PPR) on the Power architecture.
The PPR is a 64-bit register that controls the program's
priority. By adjusting the PPR value the programmer may improve
system throughput by causing system resources to be used more
efficiently, especially in contention situations. The available
unprivileged states are covered by the following functions:
* __ppc_set_ppr_med() sets the Program Priority Register value
to medium (default).
* __ppc_set_ppr_very_low() sets the Program Priority Register
value to very low.
* __ppc_set_ppr_low() sets the Program Priority Register value
to low.
* __ppc_set_ppr_med_low() sets the Program Priority Register
value to medium low.
The privileged state medium high may also be set during certain
time intervals by problem-state (unprivileged) programs, with the
following function:
* __ppc_set_ppr_med_high() sets the Program Priority to medium
high.
If the program priority is medium high when the time interval
expires or if an attempt is made to set the priority to medium
high when it is not allowed, the priority is set to medium.
The functions __ppc_set_ppr_med(), __ppc_set_ppr_low(), and
__ppc_set_ppr_med_low() are provided by glibc since version 2.18.
The functions __ppc_set_ppr_very_low() and
__ppc_set_ppr_med_high() first appeared in glibc in version 2.23.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│__ppc_set_ppr_med(), │ Thread safety │ MT-Safe │
│__ppc_set_ppr_very_low(), │ │ │
│__ppc_set_ppr_low(), │ │ │
│__ppc_set_ppr_med_low(), │ │ │
│__ppc_set_ppr_med_high() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
These functions are nonstandard GNU extensions.
The functions __ppc_set_ppr_very_low() and
__ppc_set_ppr_med_high() will be defined by <sys/platform/ppc.h>
if _ARCH_PWR8 is defined. Availability of these functions can be
tested using #ifdef _ARCH_PWR8.
__ppc_yield(3)
Power ISA, Book II - Section 3.1 (Program Priority Registers)
This page is part of release 5.13 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
https://www.kernel.org/doc/man-pages/.
GNU C Library 2021-03-22 __PPC_SET_PPR_MED(3)
Pages that refer to this page: __ppc_yield(3)
Copyright and license for this manual page
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