Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) # SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) # Timer Interrupt Frequency Configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) choice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 	prompt "Timer frequency"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	default HZ_250
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	 Allows the configuration of the timer frequency. It is customary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	 to have the timer interrupt run at 1000 Hz but 100 Hz may be more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	 beneficial for servers and NUMA systems that do not need to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	 a fast response for user interaction and that may experience bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	 contention and cacheline bounces as a result of timer interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	 Note that the timer interrupt occurs on each processor in an SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	 environment leading to NR_CPUS * HZ number of timer interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	 per second.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	config HZ_100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		bool "100 HZ"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	  100 Hz is a typical choice for servers, SMP and NUMA systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	  with lots of processors that may show reduced performance if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	  too many timer interrupts are occurring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	config HZ_250
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		bool "250 HZ"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	 250 Hz is a good compromise choice allowing server performance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	 while also showing good interactive responsiveness even
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	 on SMP and NUMA systems. If you are going to be using NTSC video
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	 or multimedia, selected 300Hz instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	config HZ_300
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		bool "300 HZ"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	 300 Hz is a good compromise choice allowing server performance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	 while also showing good interactive responsiveness even
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	 on SMP and NUMA systems and exactly dividing by both PAL and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	 NTSC frame rates for video and multimedia work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	config HZ_1000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		bool "1000 HZ"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	help
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	 1000 Hz is the preferred choice for desktop systems and other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	 systems requiring fast interactive responses to events.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) endchoice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) config HZ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	default 100 if HZ_100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	default 250 if HZ_250
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	default 300 if HZ_300
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	default 1000 if HZ_1000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) config SCHED_HRTICK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	def_bool HIGH_RES_TIMERS