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Revision d9abdee5fd5abffd0e763e52fbfa3116de167822 authored by Linus Torvalds on 19 October 2021, 15:41:36 UTC, committed by Linus Torvalds on 19 October 2021, 15:41:36 UTC 
Merge branch 'akpm' (patches from Andrew)
 
Merge misc fixes from Andrew Morton:
 "19 patches.

  Subsystems affected by this patch series: mm (userfaultfd, migration,
  memblock, mempolicy, slub, secretmem, and thp), ocfs2, binfmt, vfs,
  and misc"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mailmap: add Andrej Shadura
  mm/thp: decrease nr_thps in file's mapping on THP split
  mm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()
  vfs: check fd has read access in kernel_read_file_from_fd()
  elfcore: correct reference to CONFIG_UML
  mm, slub: fix incorrect memcg slab count for bulk free
  mm, slub: fix potential use-after-free in slab_debugfs_fops
  mm, slub: fix potential memoryleak in kmem_cache_open()
  mm, slub: fix mismatch between reconstructed freelist depth and cnt
  mm, slub: fix two bugs in slab_debug_trace_open()
  mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()
  memblock: check memory total_size
  ocfs2: mount fails with buffer overflow in strlen
  ocfs2: fix data corruption after conversion from inline format
  mm/migrate: fix CPUHP state to update node demotion order
  mm/migrate: add CPU hotplug to demotion #ifdef
  mm/migrate: optimize hotplug-time demotion order updates
  userfaultfd: fix a race between writeprotect and exit_mmap()
  mm/userfaultfd: selftests: fix memory corruption with thp enabled
2 parent s 519d819 + 362d5df
Raw File
Kconfig.hz 
# SPDX-License-Identifier: GPL-2.0-only
#
# Timer Interrupt Frequency Configuration
#

choice
	prompt "Timer frequency"
	default HZ_250
	help
	 Allows the configuration of the timer frequency. It is customary
	 to have the timer interrupt run at 1000 Hz but 100 Hz may be more
	 beneficial for servers and NUMA systems that do not need to have
	 a fast response for user interaction and that may experience bus
	 contention and cacheline bounces as a result of timer interrupts.
	 Note that the timer interrupt occurs on each processor in an SMP
	 environment leading to NR_CPUS * HZ number of timer interrupts
	 per second.


	config HZ_100
		bool "100 HZ"
	help
	  100 Hz is a typical choice for servers, SMP and NUMA systems
	  with lots of processors that may show reduced performance if
	  too many timer interrupts are occurring.

	config HZ_250
		bool "250 HZ"
	help
	 250 Hz is a good compromise choice allowing server performance
	 while also showing good interactive responsiveness even
	 on SMP and NUMA systems. If you are going to be using NTSC video
	 or multimedia, selected 300Hz instead.

	config HZ_300
		bool "300 HZ"
	help
	 300 Hz is a good compromise choice allowing server performance
	 while also showing good interactive responsiveness even
	 on SMP and NUMA systems and exactly dividing by both PAL and
	 NTSC frame rates for video and multimedia work.

	config HZ_1000
		bool "1000 HZ"
	help
	 1000 Hz is the preferred choice for desktop systems and other
	 systems requiring fast interactive responses to events.

endchoice

config HZ
	int
	default 100 if HZ_100
	default 250 if HZ_250
	default 300 if HZ_300
	default 1000 if HZ_1000

config SCHED_HRTICK
	def_bool HIGH_RES_TIMERS
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