Re: [Qemu-devel] [PATCH RFC 0/2] numa: allocate CPUs masks dynamically

[Alexey Kardashevskiy]

On 17/11/16 03:02, Igor Mammedov wrote:
> This series removes global MAX_CPUMASK_BITS constant
> so that it won't inderectly influence maximum CPUs count
> supported by different targets.
> 
> It replaces statically allocated bitmasks with dynamically
> allocated ones using '-smp maxcpus' value for setting
> bitmasks size.
> That would allocate just enough memory to handle all
> CPUs indexes that a QEMU instance would ever have.
> 
> CC: Alexey Kardashevskiy <address@hidden>
> CC: Greg Kurz <address@hidden>
> CC: David Gibson <address@hidden>
> CC: Eduardo Habkost <address@hidden>
> CC: Paolo Bonzini <address@hidden>
> 
> 
> Igor Mammedov (2):
>   add bitmap_free() wrapper
>   numa: make -numa parser dynamically allocate CPUs masks

Nice, with "ulimit -n 3072", guest kernel with CONFIG_NR_CPUS=2048,
"mc->max_cpus = 2048;" in  hw/ppc/spapr.c, and "-smp 2048,threads=8" in
QEMU cmdline, I get all 2048 CPUs in the guest.


Tested-by: Alexey Kardashevskiy <address@hidden>


> 
>  include/qemu/bitmap.h   |  5 +++++
>  include/sysemu/numa.h   |  2 +-
>  include/sysemu/sysemu.h |  7 -------
>  numa.c                  | 19 ++++++++++++-------
>  vl.c                    |  5 -----
>  5 files changed, 18 insertions(+), 20 deletions(-)
> 


-- 
Alexey