subject:"\[Qemu\-devel\] \[PULL 02\/32\] memory\: RCU ram_list.dirty_memory\[\] for safe RAM hotplug"

Re: [Qemu-devel] [PULL 02/32] memory: RCU ram_list.dirty_memory[] for safe RAM hotplug

2016-02-10 Thread Leon Alrae

Hi, I just noticed significant performance hit with this change. Booting small system (I tried on system mips only) was usually taking around 20 seconds, now reaches 3 minutes with this change. Leon On 09/02/16 12:13, Paolo Bonzini wrote: > From: Stefan Hajnoczi > >

Re: [Qemu-devel] [PULL 02/32] memory: RCU ram_list.dirty_memory[] for safe RAM hotplug

2016-02-10 Thread Paolo Bonzini

On 10/02/2016 17:56, Leon Alrae wrote: > Hi, > > I just noticed significant performance hit with this change. Booting > small system (I tried on system mips only) was usually taking around 20 > seconds, now reaches 3 minutes with this change. You're lucky that it booted at all. :)

[Qemu-devel] [PULL 02/32] memory: RCU ram_list.dirty_memory[] for safe RAM hotplug

2016-02-09 Thread Paolo Bonzini

From: Stefan Hajnoczi Although accesses to ram_list.dirty_memory[] use atomics so multiple threads can safely dirty the bitmap, the data structure is not fully thread-safe yet. This patch handles the RAM hotplug case where ram_list.dirty_memory[] is grown.