Re: [PATCH 2/2] mm: adds NOSIGBUS extension for out-of-band shmem read

From: Simon Ser
Date: Thu Jun 03 2021 - 15:35:42 EST

On Thursday, June 3rd, 2021 at 9:24 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:

> I don’t understand the use case well enough to comment on whether MAP_PRIVATE
> is sufficient, but I’m with Hugh: if this feature is implemented for
> MAP_SHARED, it should be fully coherent.

I've tried to explain what we'd need from user-space PoV in [1].
tl;dr the MAP_PRIVATE restriction would get us pretty far, even if it
won't allow us to have all of the bells and whistles.