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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH 4/5] virtio-blk: release reference to RAM's memoryRegion |
Date: | Tue, 16 Apr 2013 10:12:40 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
Il 16/04/2013 09:57, Stefan Hajnoczi ha scritto: > So it sounds like unplug will not block and there is no guarantee the > memory is actually unplugged when the monitor command completes. The > memory region is only released when the last reference count holder lets > go. > > This means that pending I/O to a hung NFS mount can delay the actual > unplug for unbounded time (by default the kernel NFS client keeps > retrying and does not fail the I/O request). The user will be able to > issue additional monitor commands and see that memory is not yet > unplugged? I think "info mtree" would provide information. We can add an event too, similar to the recently added DEVICE_DELETED. Paolo
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