From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Kevin Wolf" <kwolf@redhat.com>,
"Daniel P. Berrangé" <berrange@redhat.com>,
"Ben Warren" <ben@skyportsystems.com>,
"David Hildenbrand" <david@redhat.com>,
"Markus Armbruster" <armbru@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Peter Lieven" <pl@kamp.de>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"Max Reitz" <mreitz@redhat.com>,
"Ronnie Sahlberg" <ronniesahlberg@gmail.com>,
"Igor Mammedov" <imammedo@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
qemu-block@nongnu.org, "Richard Henderson" <rth@twiddle.net>
Subject: [PATCH v3 3/9] qapi/misc.json: Correct balloon documentation
Date: Mon, 25 May 2020 17:06:34 +0200 [thread overview]
Message-ID: <20200525150640.30879-4-philmd@redhat.com> (raw)
In-Reply-To: <20200525150640.30879-1-philmd@redhat.com>
The documentation incorrectly uses the "size of the balloon"
description when it should be "logical size of the VM". Fix it.
The relation between both values is:
logical_vm_size = vm_ram_size - balloon_size
Reported-by: David Hildenbrand <david@redhat.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
qapi/misc.json | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/qapi/misc.json b/qapi/misc.json
index 2c48ffaa62..446fc8ff83 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -191,7 +191,8 @@
#
# Information about the guest balloon device.
#
-# @actual: the number of bytes the balloon currently contains
+# @actual: the logical size of the VM in bytes
+# Formula used: logical_vm_size = vm_ram_size - balloon_size
#
# Since: 0.14.0
#
@@ -227,7 +228,8 @@
# Emitted when the guest changes the actual BALLOON level. This value is
# equivalent to the @actual field return by the 'query-balloon' command
#
-# @actual: actual level of the guest memory balloon in bytes
+# @actual: the logical size of the VM in bytes
+# Formula used: logical_vm_size = vm_ram_size - balloon_size
#
# Note: this event is rate-limited.
#
@@ -756,7 +758,10 @@
#
# Request the balloon driver to change its balloon size.
#
-# @value: the target size of the balloon in bytes
+# @value: the target logical size of the VM in bytes
+# We can deduce the size of the balloon using this formula:
+# logical_vm_size = vm_ram_size - balloon_size
+# From it we have: balloon_size = vm_ram_size - @value
#
# Returns: - Nothing on success
# - If the balloon driver is enabled but not functional because the KVM
@@ -774,6 +779,8 @@
# -> { "execute": "balloon", "arguments": { "value": 536870912 } }
# <- { "return": {} }
#
+# With a 2.5GiB guest this command inflated the ballon to 3GiB.
+#
##
{ 'command': 'balloon', 'data': {'value': 'int'} }
--
2.21.3
next prev parent reply other threads:[~2020-05-25 15:09 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 15:06 [PATCH v3 0/9] user-mode: Prune build dependencies (part 2) Philippe Mathieu-Daudé
2020-05-25 15:06 ` [PATCH v3 1/9] target/i386: Restrict X86CPUFeatureWord to X86 targets Philippe Mathieu-Daudé
2020-05-26 6:45 ` Markus Armbruster
2020-05-26 7:23 ` Philippe Mathieu-Daudé
2020-05-26 7:36 ` Philippe Mathieu-Daudé
2020-05-26 9:02 ` Markus Armbruster
2020-05-25 15:06 ` [PATCH v3 2/9] qapi/misc: Restrict LostTickPolicy enum to machine code Philippe Mathieu-Daudé
2020-05-26 7:34 ` Markus Armbruster
2020-05-25 15:06 ` Philippe Mathieu-Daudé [this message]
2020-05-26 7:43 ` [PATCH v3 3/9] qapi/misc.json: Correct balloon documentation David Hildenbrand
2020-05-25 15:06 ` [PATCH v3 4/9] qapi/misc: Restrict balloon-related commands to machine code Philippe Mathieu-Daudé
2020-05-26 7:35 ` David Hildenbrand
2020-05-26 7:36 ` David Hildenbrand
2020-05-26 7:38 ` Markus Armbruster
2020-05-26 8:04 ` Philippe Mathieu-Daudé
2020-05-26 9:04 ` Markus Armbruster
2020-05-26 9:31 ` Philippe Mathieu-Daudé
2020-05-26 15:36 ` Philippe Mathieu-Daudé
2020-05-27 4:49 ` Markus Armbruster
2020-05-27 7:31 ` Philippe Mathieu-Daudé
2020-05-25 15:06 ` [PATCH v3 5/9] qapi/misc: Restrict query-vm-generation-id command " Philippe Mathieu-Daudé
2020-05-26 7:41 ` Markus Armbruster
2020-05-25 15:06 ` [PATCH v3 6/9] qapi/misc: Move query-uuid " Philippe Mathieu-Daudé
2020-05-26 7:42 ` Markus Armbruster
2020-05-25 15:06 ` [PATCH v3 7/9] qapi/misc: Restrict ACPI commands " Philippe Mathieu-Daudé
2020-05-26 7:44 ` Markus Armbruster
2020-05-25 15:06 ` [PATCH v3 8/9] qapi/misc: Restrict PCI " Philippe Mathieu-Daudé
2020-05-26 7:44 ` Markus Armbruster
2020-05-25 15:06 ` [PATCH v3 9/9] qapi/misc: Restrict device memory " Philippe Mathieu-Daudé
2020-05-26 8:18 ` Markus Armbruster
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