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qemu / qemu / 20c2345290f34aac434284cf9a242c7904d39a27
commit20c2345290f34aac434284cf9a242c7904d39a27[log] [tgz]
authorIgor Mammedov <imammedo@redhat.com>Thu Aug 14 18:05:57 2025 +0200
committerPaolo Bonzini <pbonzini@redhat.com>Fri Aug 29 12:48:14 2025 +0200
tree968e62f3fde1a60b9ce4b97eec733258ea32e527
parenta453bf0354412592362139bdf4df0d4900ec0686 [diff]
hpet: make main counter read lock-less

Make access to main HPET counter lock-less.

In unlikely event of an update in progress, readers will busy wait
untill update is finished.

As result micro benchmark of concurrent reading of HPET counter
with large number of vCPU shows over 80% better (less) latency.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20250814160600.2327672-6-imammedo@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 file changed
tree: 968e62f3fde1a60b9ce4b97eec733258ea32e527
  1. .github/
  2. .gitlab/
  3. .gitlab-ci.d/
  4. accel/
  5. audio/
  6. authz/
  7. backends/
  8. block/
  9. bsd-user/
  10. chardev/
  11. common-user/
  12. configs/
  13. contrib/
  14. crypto/
  15. disas/
  16. docs/
  17. dump/
  18. ebpf/
  19. fpu/
  20. fsdev/
  21. gdb-xml/
  22. gdbstub/
  23. host/
  24. hw/
  25. include/
  26. io/
  27. libdecnumber/
  28. linux-headers/
  29. linux-user/
  30. migration/
  31. monitor/
  32. nbd/
  33. net/
  34. pc-bios/
  35. plugins/
  36. po/
  37. python/
  38. qapi/
  39. qga/
  40. qobject/
  41. qom/
  42. replay/
  43. roms/
  44. rust/
  45. scripts/
  46. scsi/
  47. semihosting/
  48. stats/
  49. storage-daemon/
  50. stubs/
  51. subprojects/
  52. system/
  53. target/
  54. tcg/
  55. tests/
  56. tools/
  57. trace/
  58. ui/
  59. util/
  60. .b4-config
  61. .dir-locals.el
  62. .editorconfig
  63. .exrc
  64. .gdbinit
  65. .git-blame-ignore-revs
  66. .gitattributes
  67. .gitignore
  68. .gitlab-ci.yml
  69. .gitmodules
  70. .gitpublish
  71. .mailmap
  72. .patchew.yml
  73. .readthedocs.yml
  74. .travis.yml
  75. block.c
  76. blockdev-nbd.c
  77. blockdev.c
  78. blockjob.c
  79. clippy.toml
  80. configure
  81. COPYING
  82. COPYING.LIB
  83. cpu-common.c
  84. cpu-target.c
  85. event-loop-base.c
  86. gitdm.config
  87. hmp-commands-info.hx
  88. hmp-commands.hx
  89. iothread.c
  90. job-qmp.c
  91. job.c
  92. Kconfig
  93. Kconfig.host
  94. LICENSE
  95. MAINTAINERS
  96. Makefile
  97. meson.build
  98. meson_options.txt
  99. module-common.c
  100. os-posix.c
  101. os-wasm.c
  102. os-win32.c
  103. page-target.c
  104. page-vary-common.c
  105. page-vary-target.c
  106. pythondeps.toml
  107. qemu-bridge-helper.c
  108. qemu-edid.c
  109. qemu-img-cmds.hx
  110. qemu-img.c
  111. qemu-io-cmds.c
  112. qemu-io.c
  113. qemu-keymap.c
  114. qemu-nbd.c
  115. qemu-options.hx
  116. qemu.nsi
  117. qemu.sasl
  118. README.rst
  119. replication.c
  120. target-info-stub.c
  121. target-info.c
  122. trace-events
  123. VERSION
  124. version.rc