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memimport: Support memfd blocks

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To transfer memfd-backed blocks without passing their fd every time,
thus minimizing overhead and avoiding fd leaks, a command is sent
with the memfd fd as ancil data very early on.

This command has an ID that uniquely identifies the memfd region.
Further memfd block references are then exclusively done using this
ID.

This commit implements the details of such 'permanent' mappings on
the receiving end, using memimport segments.

Suggested-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
This commit is contained in:
Ahmed S. Darwish 2016-03-13 01:07:27 +02:00 • committed by David Henningsson
parent 73e86b1cb1
commit f8714af56b
6 changed files with 113 additions and 23 deletions
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4
src/pulsecore/pstream.c
View file

@ -536,6 +536,7 @@ static void prepare_next_write_item(pa_pstream *p) {
flags = (uint32_t) (p->write.current->seek_mode & PA_FLAG_SEEKMASK);
if (p->use_shm) {
pa_mem_type_t type;
uint32_t block_id, shm_id;
size_t offset, length;
uint32_t *shm_info = (uint32_t *) &p->write.minibuf[PA_PSTREAM_DESCRIPTOR_SIZE];
@ -550,10 +551,12 @@ static void prepare_next_write_item(pa_pstream *p) {
if (pa_memexport_put(current_export,
p->write.current->chunk.memblock,
&type,
&block_id,
&shm_id,
&offset,
&length) >= 0) {
pa_assert(type == PA_MEM_TYPE_SHARED_POSIX);
flags |= PA_FLAG_SHMDATA;
if (pa_mempool_is_remote_writable(current_pool))
@ -891,6 +894,7 @@ static int do_read(pa_pstream *p, struct pstream_read *re) {
pa_assert(p->import);
if (!(b = pa_memimport_get(p->import,
PA_MEM_TYPE_SHARED_POSIX,
ntohl(re->shm_info[PA_PSTREAM_SHM_BLOCKID]),
ntohl(re->shm_info[PA_PSTREAM_SHM_SHMID]),
ntohl(re->shm_info[PA_PSTREAM_SHM_INDEX]),