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Add syfs nodes for each xenbus device showing event statistics (number of events and spurious events, number of associated event channels) and for setting a spurious event threshold in case a frontend is sending too many events without being rogue on purpose. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20210219154030.10892-7-jgross@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
What: /sys/devices/*/xenbus/event_channels
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Date: February 2021
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Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
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Description:
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Number of Xen event channels associated with a kernel based
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paravirtualized device frontend or backend.
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What: /sys/devices/*/xenbus/events
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Date: February 2021
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Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
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Description:
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Total number of Xen events received for a Xen pv device
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frontend or backend.
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What: /sys/devices/*/xenbus/jiffies_eoi_delayed
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Date: February 2021
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Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
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Description:
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Summed up time in jiffies the EOI of an interrupt for a Xen
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pv device has been delayed in order to avoid stalls due to
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event storms. This value rising is a first sign for a rogue
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other end of the pv device.
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What: /sys/devices/*/xenbus/spurious_events
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Date: February 2021
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Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
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Description:
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Number of events received for a Xen pv device which did not
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require any action. Too many spurious events in a row will
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trigger delayed EOI processing.
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What: /sys/devices/*/xenbus/spurious_threshold
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Date: February 2021
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Contact: Xen Developers mailing list <xen-devel@lists.xenproject.org>
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Description:
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Controls the tolerated number of subsequent spurious events
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before delayed EOI processing is triggered for a Xen pv
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device. Default is 1. This can be modified in case the other
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end of the pv device is issuing spurious events on a regular
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basis and is known not to be malicious on purpose. Raising
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the value for such cases can improve pv device performance.
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