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Message-ID: <4AF9E0AA.8040100@us.ibm.com> Date: Tue, 10 Nov 2009 15:52:42 -0600 From: Anthony Liguori <aliguori@...ibm.com> To: Rusty Russell <rusty@...tcorp.com.au> CC: agl@...ux.vnet.ibm.com, qemu-devel@...gnu.org, Avi Kivity <avi@...hat.com>, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: virtio: Add memory statistics reporting to the balloon driver Rusty Russell wrote: > On Tue, 10 Nov 2009 03:02:06 am Adam Litke wrote: > >> A simpler approach is to collect memory statistics in the virtio >> balloon driver and communicate them to the host via the device config space. >> > > There are two issues I see with this. First, there's an atomicity problem > since you can't tell when the stats are consistent. Second, polling is > ugly. > > A stats vq might solve this more cleanly? > This turns out to not work so nicely. You really need bidirectional communication. You need to request that stats be collected and then you need to tell the hypervisor about the stats that were collected. You don't need any real correlation between requests and stat reports either. This really models how target/actual work and I think it suggests that we want to reuse that mechanism for the stats too. > Rusty. > -- Regards, Anthony Liguori -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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