Re: [dpdk-dev] [PATCH] memory: do not use base-virtaddr in secondary processes

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 18-Jun-18 8:53 PM, Dariusz Stojaczyk wrote:
> Since secondary process' address space is highly dictated
> by the primary process' mappings, it doesn't make much
> sense to use base-virtaddr for secondary processes.
> 
> This patch is intended to fix PCI resource mapping
> in secondary processes using the same base-virtaddr
> as their primary processes. PCI uses the end of the hugepage
> memory area to map all resources. [pci_find_max_end_va()]
> It works for primary processes, but can't be mapped 1:1
> by secondary ones, as the same addresses are currently always
> occupied by shadow memseg lists, which were created with
> eal_get_virtual_area(NULL, ...).
> 
> ```
> PRIMARY PROCESS
> 0x6e00e00000    388K rw-s- fbarray_memseg-2048k-1-3
> 0x6e01000000 16777216K r----   [ anon ]
> 0x7201000000     16K rw-s- resource0
> 
> SECONDARY PROCESS
> 0x6e00e00000    388K rw-s- fbarray_memseg-2048k-1-3
> 0x6e01000000 16777216K r----   [ anon ]
> 0x7201000000      4K rw-s- fbarray_memseg-1048576k-0-0_203213
> ```
> 
> Fixes: 524e43c2ad9a ("mem: prepare memseg lists for multiprocess sync")
> Cc: anatoly.burakov@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
> ---

Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

-- 
Thanks,
Anatoly