+++ /dev/null
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-From: Luiz Capitulino <lcapitulino@redhat.com>
-To: <qemu-devel@nongnu.org>
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-Subject: [PATCH 3/3] docs: document virtio-balloon stats
-Date: Fri, 14 Dec 2012 13:49:42 -0200
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-Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
----
- docs/virtio-balloon-stats.txt | 91 +++++++++++++++++++++++++++++++++++++++++++
- 1 file changed, 91 insertions(+)
- create mode 100644 docs/virtio-balloon-stats.txt
-
-diff --git a/docs/virtio-balloon-stats.txt b/docs/virtio-balloon-stats.txt
-new file mode 100644
-index 0000000..990e746
---- /dev/null
-+++ b/docs/virtio-balloon-stats.txt
-@@ -0,0 +1,91 @@
-+virtio balloon memory statistics
-+================================
-+
-+The virtio balloon driver supports guest memory statistics reporting. These
-+statistics are available to QEMU users as QOM (QEMU Object Model) device
-+properties via a polling mechanism.
-+
-+Basically, clients first have to enable polling, then they can query the
-+available statistics.
-+
-+There are two control properties and six memory statistics properties.
-+
-+The control properties are:
-+
-+ o stats-polling-interval: polling time interval in seconds, it can be:
-+
-+ > 0 enables polling in the specified interval. If polling is already
-+ enabled, the polling time interval will be changed to the new value
-+
-+ 0 disables polling. Previous polled statistics are still valid and
-+ can be queried.
-+
-+ o stats-last-update: last stats update timestamp, in seconds
-+
-+The following statistics are available, all values are in bytes:
-+
-+ o stat-swap-in
-+ o stat-swap-out
-+ o stat-major-faults
-+ o stat-minor-faults
-+ o stat-free-memory
-+ o stat-total-memory
-+
-+Also, please note the following:
-+
-+ - If a statistic is queried before the timer is enabled or if the guest
-+ doesn't support a particular statistic, an error will be returned
-+
-+ - Previously polled statistics remain available even if the timer is
-+ later disabled
-+
-+ - Polling can be enabled even if the guest doesn't support memory
-+ statistics or its balloon driver hasn't been loaded. Applications
-+ can check this condition by checking that stats-last-update doesn't
-+ change
-+
-+ - The polling timer is only re-armed when the guest responds to the
-+ statistics request. This means that if a (buggy) guest doesn't
-+ ever respond to the request the timer will never be re-armed,
-+ which has the same effect as disabling polling
-+
-+Here are a few examples. The virtio-balloon device is assumed to be in the
-+'/machine/peripheral-anon/device[1]' QOM path.
-+
-+Enable polling with 2 seconds interval:
-+
-+{ "execute": "qom-set",
-+ "arguments": { "path": "/machine/peripheral-anon/device[1]",
-+ "property": "stats-polling-interval", "value": 2 } }
-+
-+{ "return": {} }
-+
-+Change polling to 10 seconds:
-+
-+{ "execute": "qom-set",
-+ "arguments": { "path": "/machine/peripheral-anon/device[1]",
-+ "property": "stats-polling-interval", "value": 10 } }
-+
-+{ "return": {} }
-+
-+Get last update timestamp and free memory stat:
-+
-+{ "execute": "qom-get",
-+ "arguments": { "path": "/machine/peripheral-anon/device[1]",
-+ "property": "stats-last-update" } }
-+
-+{ "return": 1354629634 }
-+
-+{ "execute": "qom-get",
-+ "arguments": { "path": "/machine/peripheral-anon/device[1]",
-+ "property": "stat-free-memory" } }
-+
-+{ "return": 845115392 }
-+
-+Disable polling:
-+
-+{ "execute": "qom-set",
-+ "arguments": { "path": "/machine/peripheral-anon/device[1]",
-+ "property": "stats-polling-interval", "value": 0 } }
-+
-+{ "return": {} }
---
-1.8.0
-
-
-
projects / pve-qemu-kvm.git / blobdiff