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From: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
To: Pavel Fedin <p.fedin@samsung.com>
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Date: Tue, 12 Jan 2016 11:33:03 +0000
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Cc: nakajima.yoshihiro@lab.ntt.co.jp, "'Michael S. Tsirkin'" <mst@redhat.com>,
 dev@dpdk.org, ann.zhuangyanying@huawei.com
Subject: Re: [dpdk-dev] [PATCH 2/4] mem: add API to obstain memory-backed
 file info
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On 12/01/2016 11:22, Pavel Fedin wrote:
>   Hello!
>
>> Oh I get it and recognize the problem here. The actual problem lies in
>> the API rte_eal_get_backfile_info().
>> backfiles[i].size = hugepage_files[i].size;
>> Should use statfs or hugepage_files[i].size * hugepage_files[i].repeated
>> to calculate the total size.
>   .repeated depends on CONFIG_RTE_EAL_SIGLE_FILE_SEGMENTS. By the way, looks like it does the same thing as you are trying to do with --single-file, but with hugepages, doesn't it? I see it's currently used by ivshmem (which is AFAIK very immature and half-abandoned).

Similar but not the same.
--single-file: a single file for all mapped hugepages.
SINGLE_FILE_SEGMENTS: a file per set of physically contiguous mapped 
hugepages (what DPDK calls memseg , memory segment). So there could be 
more than one file.

Sergio
>   Or should we just move .repeated out of the #ifdef ?
>
> Kind regards,
> Pavel Fedin
> Senior Engineer
> Samsung Electronics Research center Russia
>
>