From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Suleiman Souhlal <suleiman@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCH] KVM: do not shrink halt_poll_ns below grow_start
Date: Wed, 15 Sep 2021 10:42:10 +0900 [thread overview]
Message-ID: <YUFPcphBWO8bz7Lk@google.com> (raw)
In-Reply-To: <20210902031100.252080-1-senozhatsky@chromium.org>
On (21/09/02 12:11), Sergey Senozhatsky wrote:
> grow_halt_poll_ns() ignores values between 0 and
> halt_poll_ns_grow_start (10000 by default). However,
> when we shrink halt_poll_ns we may fall way below
> halt_poll_ns_grow_start and endup with halt_poll_ns
> values that don't make a lot of sense: like 1 or 9,
> or 19.
>
> VCPU1 trace (halt_poll_ns_shrink equals 2):
>
> VCPU1 grow 10000
> VCPU1 shrink 5000
> VCPU1 shrink 2500
> VCPU1 shrink 1250
> VCPU1 shrink 625
> VCPU1 shrink 312
> VCPU1 shrink 156
> VCPU1 shrink 78
> VCPU1 shrink 39
> VCPU1 shrink 19
> VCPU1 shrink 9
> VCPU1 shrink 4
>
> Mirror what grow_halt_poll_ns() does and set halt_poll_ns
> to 0 as soon as new shrink-ed halt_poll_ns value falls
> below halt_poll_ns_grow_start.
Gentle ping.
-ss
next prev parent reply other threads:[~2021-09-15 1:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-02 3:11 [PATCH] KVM: do not shrink halt_poll_ns below grow_start Sergey Senozhatsky
2021-09-15 1:42 ` Sergey Senozhatsky [this message]
2021-09-21 17:50 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YUFPcphBWO8bz7Lk@google.com \
--to=senozhatsky@chromium.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=suleiman@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.