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
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