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Documentation: KVM: make corrections to halt-polling.rst

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Module parameters are in sysfs, not debugfs, so change that.

Remove superfluous "that" following "Note:".
Hyphenate "system-wide" values.
Hyphenate "trade-off".

Don't treat "denial of service" as a verb.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: kvm@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230612030810.23376-2-rdunlap@infradead.org
This commit is contained in:
Randy Dunlap 2023-06-11 20:08:07 -07:00 committed by Jonathan Corbet
parent 1954d51592
commit 4c60d49913
1 changed files with 5 additions and 5 deletions
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Documentation/virt/kvm/halt-polling.rst
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@ -112,11 +112,11 @@ powerpc kvm-hv case.
| | function. | |
+-----------------------+---------------------------+-------------------------+
These module parameters can be set from the debugfs files in:
These module parameters can be set from the sysfs files in:
/sys/module/kvm/parameters/
Note: that these module parameters are system wide values and are not able to
Note: these module parameters are system-wide values and are not able to
be tuned on a per vm basis.
Any changes to these parameters will be picked up by new and existing vCPUs the
@ -142,12 +142,12 @@ Further Notes
global max polling interval (halt_poll_ns) then the host will always poll for the
entire block time and thus cpu utilisation will go to 100%.
- Halt polling essentially presents a trade off between power usage and latency and
- Halt polling essentially presents a trade-off between power usage and latency and
the module parameters should be used to tune the affinity for this. Idle cpu time is
essentially converted to host kernel time with the aim of decreasing latency when
entering the guest.
- Halt polling will only be conducted by the host when no other tasks are runnable on
that cpu, otherwise the polling will cease immediately and schedule will be invoked to
allow that other task to run. Thus this doesn't allow a guest to denial of service the
cpu.
allow that other task to run. Thus this doesn't allow a guest to cause denial of service
of the cpu.