Re: [Xen-devel] [PATCH 4/6] replace vCPU's dirty CPU mask by numeric ID

2018-01-22 Thread Andrew Cooper
On 22/01/2018 09:39, Jan Beulich wrote: On 19.01.18 at 18:48, wrote: >> On 19/01/18 16:06, Jan Beulich wrote: >>> At most one bit can be set in the masks, so especially on larger systems >>> it's quite a bit of unnecessary memory and processing overhead to track

Re: [Xen-devel] [PATCH 4/6] replace vCPU's dirty CPU mask by numeric ID

2018-01-19 Thread Andrew Cooper
On 19/01/18 16:06, Jan Beulich wrote: > At most one bit can be set in the masks, so especially on larger systems > it's quite a bit of unnecessary memory and processing overhead to track > the information as a mask. Store the numeric ID of the respective CPU > instead, or NR_CPUS if no dirty state

Re: [Xen-devel] [PATCH 4/6] replace vCPU's dirty CPU mask by numeric ID

2018-01-19 Thread George Dunlap
On 01/19/2018 04:06 PM, Jan Beulich wrote: > At most one bit can be set in the masks, so especially on larger systems > it's quite a bit of unnecessary memory and processing overhead to track > the information as a mask. Store the numeric ID of the respective CPU > instead, or NR_CPUS if no dirty