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Re: [Qemu-devel] [PATCH] kvm: add flightrecorder script
From: |
Marcelo Tosatti |
Subject: |
Re: [Qemu-devel] [PATCH] kvm: add flightrecorder script |
Date: |
Tue, 13 Mar 2012 20:46:52 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Mar 09, 2012 at 02:13:40PM +0000, Stefan Hajnoczi wrote:
> The kvm kernel module includes a number of trace events which can be
> useful when debugging system behavior. Even on production systems these
> trace events can be used to observe guest behavior and identify the
> source of problems.
>
> The kvm_flightrecorder script is a command-line wrapper for the
> /sys/kernel/debug/tracing interface. Kernel symbols do not need to be
> installed.
>
> This script captures a fixed-size buffer of KVM trace events. Recent
> events overwrite the oldest events when the buffer size is exceeded and
> it is possible to leave KVM tracing enabled for any period of time with
> just a fixed-size buffer. If the buffer is large enough this script is
> a useful tool for collecting detailed information after an issue occurs
> with a guest. Hence the name "flight recorder".
>
> The script can also be used in 'tail' mode to simply view KVM trace
> events as they occur. This is handy for development and to ensure that
> the guest is indeed running.
>
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
> scripts/kvm/kvm_flightrecorder | 126
> ++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 126 insertions(+), 0 deletions(-)
> create mode 100755 scripts/kvm/kvm_flightrecorder
Applied to uq/master, thanks.