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package mirage-net-xen
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Module Shared_page_poolSource
Pool and reuse shared memory blocks. This saves having to reallocate and reshare pages of memory, which is slow. A block is half the size of a page, since network packets usually don't require more than this.
make grant_access is a shared pool of blocks. When a new page is first allocated, grant_access is called to share it.
Source
val use :
t ->
(id:Cstruct.uint16 ->
Xen_os.Xen.Gntref.t ->
Cstruct.t ->
('a * unit Lwt.t) Lwt.t) ->
('a * unit Lwt.t) Lwt.tuse t fn calls fn ~id gref block with a free shared block of memory and that block's unique ID (note: the gref is NOT unique). The function should return a thread that indicates when the request has been added to the queue, by returning a result value and a second thread indicating when the block can be returned to the pool.
Rounds a size in bytes up to the number of blocks needed for it.