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Date: Tue, 29 Sep 2015 12:14:28 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
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Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Unlinking hugepage backing file after initialiation
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On Tue, Sep 29, 2015 at 09:03:15AM +0000, Ananyev, Konstantin wrote:
> 
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of shesha Sreenivasamurthy (shesha)
> > Sent: Tuesday, September 29, 2015 1:04 AM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] Unlinking hugepage backing file after initialiation
> > 
> > Hello,
> > As of DPDK2.1, backing files are created in hugetablefs during mapping (in eal_memory.c::rte_eal_hugepage_init()) and these files are
> > not cleaned up (unlinked) after initialization (mmap-ing). This means, when the application crashes or stopped, the memory is still
> > consumed. Therefore, is there any reason not to unlink backing files after initialization 
> 
> For secondary process(es) to be able to open/map them too?
> Konstantin
> 

Exactly. The hugepages are kept present on the file system so that secondary
processes can use them to attach to a primary process memory in a multi-process
setup.
What is done instead is that any old hugepage files are cleaned up when the
application starts (or restarts).

Regards,
/Bruce

> >? If no, I will send a patch for the change.
> > 
> > --
> > - Thanks
> > char * (*shesha) (uint64_t cache, uint8_t F00D)
> > { return 0x0000C0DE; }