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Date:   Tue, 13 Oct 2020 13:55:46 +0200
From:   Olaf Hering <olaf@aepfle.de>
To:     Wei Liu <wei.liu@kernel.org>
Cc:     linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>
Subject: Re: [PATCH v1] hv_balloon: disable warning when floor reached
Message-ID: <20201013135546.3c5b7feb.olaf@aepfle.de>
In-Reply-To: <20201013111921.2fa4608c.olaf@aepfle.de>
References: <20201008071216.16554-1-olaf@aepfle.de>
        <20201008091539.060c79c3.olaf@aepfle.de>
        <20201013091717.q24ypswqgmednofr@liuwe-devbox-debian-v2>
        <20201013111921.2fa4608c.olaf@aepfle.de>
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Am Tue, 13 Oct 2020 11:19:21 +0200
schrieb Olaf Hering <olaf@aepfle.de>:

> A message is generated every 5 minutes. Unclear why this remained unnotic=
ed since at least v5.3. I have added debug to my distro kernel to see what =
the involved variable values are. More info later today.

The actual values for avail_pages, num_pages and floor are shown below.
The VM has min 512M, startup 1024M. If I interpret it correctly, the host r=
equests to balloon down 83MB, while the VM has ~596MB assigned according to=
 the GUI. free still reports 878MB.

Olaf

[   66.917948] hv_balloon: Max. dynamic memory size: 2222 MB
[  331.839393] hv_balloon: Balloon request will be partially fulfilled. (65=
875 32768 54728) Balloon floor reached.
[  331.847451] hv_balloon: Balloon request will be partially fulfilled. (54=
745 21621 54728) Balloon floor reached.
[  331.848480] hv_balloon: Balloon request will be partially fulfilled. (54=
745 21604 54728) Balloon floor reached.
[  331.849465] hv_balloon: Balloon request will be partially fulfilled. (54=
745 21587 54728) Balloon floor reached.
[  331.850463] hv_balloon: Balloon request will be partially fulfilled. (54=
745 21570 54728) Balloon floor reached.
[  331.851393] hv_balloon: Balloon request will be partially fulfilled. (54=
682 21553 54728) Balloon floor reached.
[  631.814538] hv_balloon: Balloon request will be partially fulfilled. (54=
801 21553 54728) Balloon floor reached.
[  631.819084] hv_balloon: Balloon request will be partially fulfilled. (54=
801 21480 54728) Balloon floor reached.
[  631.823487] hv_balloon: Balloon request will be partially fulfilled. (54=
738 21407 54728) Balloon floor reached.
[  631.825832] hv_balloon: Balloon request will be partially fulfilled. (54=
738 21397 54728) Balloon floor reached.
[  631.827988] hv_balloon: Balloon request will be partially fulfilled. (54=
738 21387 54728) Balloon floor reached.
[  631.830111] hv_balloon: Balloon request will be partially fulfilled. (54=
738 21377 54728) Balloon floor reached.
[  931.814649] hv_balloon: Balloon request will be partially fulfilled. (54=
406 21367 54728) Balloon floor reached.
[ 1231.829087] hv_balloon: Balloon request will be partially fulfilled. (54=
408 21367 54728) Balloon floor reached.
[ 1531.859374] hv_balloon: Balloon request will be partially fulfilled. (54=
416 21367 54728) Balloon floor reached.
[ 1831.874813] hv_balloon: Balloon request will be partially fulfilled. (54=
408 21367 54728) Balloon floor reached.
[ 2131.878262] hv_balloon: Balloon request will be partially fulfilled. (54=
672 21367 54728) Balloon floor reached.
[ 2431.895144] hv_balloon: Balloon request will be partially fulfilled. (54=
532 21367 54728) Balloon floor reached.
[ 2731.916792] hv_balloon: Balloon request will be partially fulfilled. (54=
609 21367 54728) Balloon floor reached.
[ 3031.922862] hv_balloon: Balloon request will be partially fulfilled. (54=
597 21367 54728) Balloon floor reached.
[ 3331.949145] hv_balloon: Balloon request will be partially fulfilled. (54=
615 21367 54728) Balloon floor reached.
[ 3631.957564] hv_balloon: Balloon request will be partially fulfilled. (54=
540 21367 54728) Balloon floor reached.
[ 3931.969477] hv_balloon: Balloon request will be partially fulfilled. (53=
057 21367 54728) Balloon floor reached.

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