[dpdk-dev] [PATCH] mem: mark pages as not accessed when reserving VA

Aaron Conole aconole at redhat.com
Tue Mar 10 14:57:41 CET 2020


David Marchand <david.marchand at redhat.com> writes:

> When the memory allocator reserves virtual addresses, it still does not
> know what they will be used for.
> Besides, huge areas are reserved for memory hotplug in multiprocess
> setups. But most of the pages are unused in the whole life of the
> processes.
>
> Change protection mode to PROT_NONE when only reserving VA.
> The memory allocator already switches to the right mode when making use
> of it.
>
> It also has the nice effect of getting those pages skipped by the kernel
> when calling mlockall() or when a coredump gets generated.
>
> Cc: stable at dpdk.org
>
> Suggested-by: Andrea Arcangeli <aarcange at redhat.com>
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---

Acked-by: Aaron Conole <aconole at redhat.com>

Thanks!



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