cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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Kconfig.hz (1709B)


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