On 02/21/2018 03:44 AM, Andrew Morton wrote:

On Tue,  9 Jan 2018 08:30:49 +0200 Mike Rapoport [off-list ref] wrote:

quoted

This patches introduces new process_vmsplice system call that combines
functionality of process_vm_read and vmsplice.

All seems fairly strightforward.  The big question is: do we know that
people will actually use this, and get sufficient value from it to
justify its addition?

Yes, that's what bothers us a lot too :) I've tried to start with finding out if anyone 
used the sys_read/write_process_vm() calls, but failed :( Does anybody know how popular
these syscalls are? If its users operate on big amount of memory, they could benefit from
the proposed splice extension.

-- Pavel