From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Anthony Liguori <aliguori@us.ibm.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
liu ping fan <qemulist@gmail.com>,
qemu-devel@nongnu.org,
Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Subject: Re: [Qemu-devel] [PATCH 4/5] virtio-blk: release reference to RAM's memoryRegion
Date: Tue, 16 Apr 2013 10:12:40 +0200 [thread overview]
Message-ID: <516D07F8.2070603@redhat.com> (raw)
In-Reply-To: <20130416075755.GB6308@stefanha-thinkpad.redhat.com>
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
next prev parent reply other threads:[~2013-04-16 8:13 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-01 8:20 [Qemu-devel] [PATCH 0/5] proposal to make hostmem listener RAM unplug safe Liu Ping Fan
2013-04-01 8:20 ` [Qemu-devel] [PATCH 1/5] memory: add ref/unref interface for MemroyRegionOps Liu Ping Fan
2013-04-11 9:49 ` Stefan Hajnoczi
2013-04-12 4:12 ` liu ping fan
2013-04-01 8:20 ` [Qemu-devel] [PATCH 2/5] hostmem: make hostmem global and RAM hotunplg safe Liu Ping Fan
2013-04-02 6:11 ` li guang
2013-04-11 10:09 ` Paolo Bonzini
2013-04-12 6:46 ` liu ping fan
2013-04-12 8:21 ` Stefan Hajnoczi
2013-04-11 10:11 ` Stefan Hajnoczi
2013-04-11 10:26 ` Paolo Bonzini
2013-04-12 3:55 ` liu ping fan
2013-04-12 8:38 ` Stefan Hajnoczi
2013-04-12 10:03 ` Paolo Bonzini
2013-04-15 1:42 ` liu ping fan
2013-04-15 6:38 ` Paolo Bonzini
2013-04-01 8:20 ` [Qemu-devel] [PATCH 3/5] vring: use hostmem's RAM safe api Liu Ping Fan
2013-04-11 10:15 ` Stefan Hajnoczi
2013-04-12 4:49 ` liu ping fan
2013-04-12 8:41 ` Stefan Hajnoczi
2013-04-01 8:20 ` [Qemu-devel] [PATCH 4/5] virtio-blk: release reference to RAM's memoryRegion Liu Ping Fan
2013-04-02 5:58 ` li guang
2013-04-12 4:44 ` liu ping fan
2013-04-11 10:20 ` Stefan Hajnoczi
2013-04-12 4:48 ` liu ping fan
2013-04-12 8:45 ` Stefan Hajnoczi
2013-04-12 9:05 ` liu ping fan
2013-04-16 7:57 ` Stefan Hajnoczi
2013-04-16 8:12 ` Paolo Bonzini [this message]
2013-04-01 8:20 ` [Qemu-devel] [PATCH 5/5] hostmem: init/finalize hostmem listener Liu Ping Fan
2013-04-11 10:02 ` Paolo Bonzini
2013-04-11 12:08 ` liu ping fan
2013-04-11 13:14 ` Paolo Bonzini
2013-06-13 4:38 ` [Qemu-devel] about atexit() (was: [PATCH 5/5] hostmem: init/finalize hostmem listener) Amos Kong
2013-06-13 8:51 ` liu ping fan
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