tree 9c9e0df5adf4fdc513fb5bb8c6a0c0a949da7a2e
parent e1c8237df5395f6a453f18109bd9dd33fb2a397c
author Pavel Fedin <p.fedin@samsung.com> 1438345402 +0300
committer Andreas Färber <afaerber@suse.de> 1442643012 +0200

qdev: Do not use slow [*] expansion for GPIO creation

Expansion of [*] suffix is very slow because index expansion is done using
trial and error strategy, starting every time from zero and retrying with
the next index until insertion succeeds. With large number of already added
properties this process takes huge amount of time (O(n^2) complexity).

Some architectures (like ARM) use very large amount of IRQ pins in interrupt
controller models. This flaw makes machine startup extremely slow
(~20 seconds for ARM64 with 32 CPUs). This patch decreases this time down to
~10 seconds.

Also in qdev_init_gpio_out_named() memset() is now called only once for the
whole array instead of per-cell cleaning

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>