* ivshmem mmap to specific address
@ 2015-12-09 6:52 Eli Britstein
2015-12-09 10:38 ` Burakov, Anatoly
0 siblings, 1 reply; 2+ messages in thread
From: Eli Britstein @ 2015-12-09 6:52 UTC (permalink / raw)
To: dev@dpdk.org
Hello,
In librte_eal, in eal_ivshmem.c, in function map_all_segments, there is mapping of segments from the metadata to the same virtual address as written in the metadata.
Is there a method to guarantee that this mapping won't fail, even for different processes, that might have large code or constructors running even before main?
Thanks,
Eli
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: ivshmem mmap to specific address
2015-12-09 6:52 ivshmem mmap to specific address Eli Britstein
@ 2015-12-09 10:38 ` Burakov, Anatoly
0 siblings, 0 replies; 2+ messages in thread
From: Burakov, Anatoly @ 2015-12-09 10:38 UTC (permalink / raw)
To: Eli Britstein, dev@dpdk.org
Hi Eli
> Is there a method to guarantee that this mapping won't fail, even for
> different processes, that might have large code or constructors running even
> before main?
I'm afraid there is none. That's the nature of the beast. The best you can do is map stuff into a different address range using --base-virtaddr flag in the primary process and hope that this time your "large code or constructors running before main" won't tread into that virtual address space. But even that is not a guarantee by any means.
Thanks,
Anatoly
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