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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [PATCH, RFC] trace: implement guest tracepoint passthrough |
Date: | Wed, 31 Aug 2011 11:38:50 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0 |
On 08/26/2011 10:06 PM, Blue Swirl wrote:
Let guests inject tracepoint data via fw_cfg device.
At least on x86, fw_cfg is pretty slow, involving multiple exits. IMO, for kvm, even one exit per tracepoint is too high. We need to use a shared memory transport with a way to order guest/host events later on (by using a clock).
-- error compiling committee.c: too many arguments to function
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