Re: [Qemu-devel] [PATCH 0/2] Dynamic module support for block drivers

["Marc Marí" <markmb@redhat.com>]

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>On Mon, 17 Aug 2015 10:09:33 +0200
>Marc Marí <markmb@redhat.com> wrote:
>
> The current module infrastructure has been improved to enable dynamic
> module loading.
> 
> This reduces the load time for very simple guests. For the following
> configuration (very loaded)
> 
> ./configure --enable-sdl --enable-gtk --enable-vte --enable-curses \
>     --enable-vnc --enable-vnc-{jpeg,tls,sasl,png} --enable-virtfs \
>     --enable-brlapi --enable-curl --enable-fdt --enable-bluez \
>     --enable-kvm --enable-rdma --enable-uuid --enable-vde \
>     --enable-linux-aio --enable-cap-ng --enable-attr
> --enable-vhost-net \ --enable-vhost-scsi --enable-spice --enable-rbd
> --enable-libiscsi \ --enable-smartcard-nss --enable-guest-agent
> --enable-libusb \ --enable-usb-redir --enable-lzo --enable-snappy
> --enable-bzip2 \ --enable-seccomp --enable-coroutine-pool
> --enable-glusterfs \ --enable-tpm --enable-libssh2 --enable-vhdx
> --enable-numa \ --enable-tcmalloc --target-list=x86_64-softmmu
> 
> With modules disabled, there are 142 libraries loaded at startup.
> Time is the following:
>  LD time: 0.065 seconds
>  QEMU time: 0.02 seconds
>  Total time: 0.085 seconds
> 
> With this patch series and modules enabled, there are 128 libraries
> loaded at startup. Time is the following:
>  LD time: 0.02 seconds
>  QEMU time: 0.02 seconds
>  Total time: 0.04 seconds
> 
> Where LD time is the time between the program startup and the jump to
> main, and QEMU time is the time between the start of main and the
> first kvm_entry.
> 
> These results are just with a few block drivers, that were already a
> module. Adding more modules (block or not block) should be easy, and
> will reduce the load time even more.
> 
> Marc Marí (2):
>   Add dynamic module loading for block drivers
>   Add dynamic generation of module_block.h
> 
>  .gitignore                      |   1 +
>  Makefile                        |  10 ++-
>  block.c                         |  73 +++++++++++++++++++++-
>  configure                       |   2 +-
>  include/qemu/module.h           |   3 +
>  include/qemu/module_block.h     |  89 +++++++++++++++++++++++++++
>  scripts/modules/module_block.py | 132
> ++++++++++++++++++++++++++++++++++++++++
> util/module.c                   |  38 ++++-------- 8 files changed,
> 314 insertions(+), 34 deletions(-) create mode 100644
> include/qemu/module_block.h create mode 100755
> scripts/modules/module_block.py
>