Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support
From: Guy Shattah <hidden>
Date: 2017-10-16 11:09:16
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On 16/10/2017 13:33, Michal Nazarewicz wrote:
On Sun, Oct 15 2017, Guy Shattah wrote:quoted
Why have several driver specific implementation if you can generalize the idea and implement an already existing POSIX standard?Why is there a need for contiguous allocation?
This was explained in detail during a talk delivered by me and Christopher Lameter during Plumbers conference 2017 @ https://linuxplumbersconf.org/2017/ocw/proposals/4669 Please see the slides there.
If generalisation is the issue, then the solution is to define a common API where user-space can allocate memory *in the context of* a device. This provides a ‘give me memory I can use for this device’ request which is what user space really wants.
Do you suggest to add a whole new common API instead of merely adding a flag to existing one?