[CRIU] [PATCH 06/14] checkpoint: Add dumping of FPU state

[Pavel Emelyanov]

On 12/19/2012 08:31 PM, Cyrill Gorcunov wrote:
> 
> The dumping of FPU state is done with help of ptrace
> facility. There are two cases which we need to handle
> depending on which features are available on host machine
> 
> 1) The dump via ptrace(PTRACE_GETFPREGS ...)
> 
>    In this case the kernel will use fxsave approach
>    inside the kenrel and provides us back the data
>    encoded in i387_fxsave_struct format.
> 
> 2) The dump via ptrace(PTRACE_GETREGSET ...)
> 
>    In this case the kernel will use xsave approach
>    inside the kernel and provides us back the data
>    encoded in xsave_struct format

Doesn't kernel decide itself what way to get FPU stuff to use?

> In any case we decode data and save it in protobuf format.
> This is why core.proto file has been extended to keep new
> entries.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
> ---
>  cr-dump.c           | 78 ++++++++++++++++++++++++++++++++++++++++++-----------
>  protobuf/core.proto | 10 +++++++
>  2 files changed, 72 insertions(+), 16 deletions(-)
>