Messages in this thread Patch in this message | | | Subject | [RFC][PATCH] Make MAX_RT_PRIO and MAX_USER_RT_PRIO configurable | From | Steven Rostedt <> | Date | Wed, 27 Jul 2005 10:13:15 -0400 |
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The following patch makes the MAX_RT_PRIO and MAX_USER_RT_PRIO configurable from the make *config. This is more of a proposal since I'm not really sure where in Kconfig this would best fit. I don't see why these options shouldn't be user configurable without going into the kernel headers to change them.
Also, is there a way in the Kconfig to force the checking of MAX_USER_RT_PRIO <= MAX_RT_PRIO?
-- Steve
(Patched against 2.6.12.2)
Index: vanilla_kernel/include/linux/sched.h =================================================================== --- vanilla_kernel/include/linux/sched.h (revision 263) +++ vanilla_kernel/include/linux/sched.h (working copy) @@ -389,9 +389,13 @@ * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. */ -#define MAX_USER_RT_PRIO 100 -#define MAX_RT_PRIO MAX_USER_RT_PRIO +#define MAX_USER_RT_PRIO CONFIG_MAX_USER_RT_PRIO +#define MAX_RT_PRIO CONFIG_MAX_RT_PRIO +#if MAX_USER_RT_PRIO > MAX_RT_PRIO +#error MAX_USER_RT_PRIO must not be greater than MAX_RT_PRIO +#endif + #define MAX_PRIO (MAX_RT_PRIO + 40) #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) Index: vanilla_kernel/init/Kconfig =================================================================== --- vanilla_kernel/init/Kconfig (revision 263) +++ vanilla_kernel/init/Kconfig (working copy) @@ -162,6 +162,32 @@ building a kernel for install/rescue disks or your system is very limited in memory. +config MAX_RT_PRIO + int "Maximum RT priority" + default 100 + help + The real-time priority of threads that have the policy of SCHED_FIFO + or SCHED_RR have a priority higher than normal threads. This range + can be set here, where the range starts from 0 to MAX_RT_PRIO-1. + If this range is higher than MAX_USER_RT_PRIO than kernel threads + may have a higher priority than any user thread. + + This may be the same as MAX_USER_RT_PRIO, but do not set this + to be less than MAX_USER_RT_PRIO. + +config MAX_USER_RT_PRIO + int "Maximum User RT priority" + default 100 + help + The real-time priority of threads that have the policy of SCHED_FIFO + or SCHED_RR have a priority higher than normal threads. This range + can be set here, where the range starts from 0 to MAX_USER_RT_PRIO-1. + If this range is lower than MAX_RT_PRIO, than kernel threads may have + a higher priority than any user thread. + + This may be the same as MAX_RT_PRIO, but do not set this to be + greater than MAX_RT_PRIO. + config AUDIT bool "Auditing support" default y if SECURITY_SELINUX
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