[pulseaudio-discuss] [PATCH v3 10/11] client audio: Use memfd transport by default; pump protocol version
Ahmed S. Darwish
darwish.07 at gmail.com
Sat Mar 12 23:14:33 UTC 2016
Now that all layers in the stack support memfd blocks, use memfd
pools for client context and audio playback data by default.
Also provide the ability for clients to disable memfd transport
through the `enable-memfd=' client configuration option.
Signed-off-by: Ahmed S. Darwish <darwish.07 at gmail.com>
---
PROTOCOL | 12 +++++++++++
configure.ac | 2 +-
man/pulse-client.conf.5.xml.in | 8 ++++++++
src/pulse/client-conf.c | 1 +
src/pulse/client-conf.h | 2 +-
src/pulse/context.c | 44 +++++++++++++++++++++++++++++++++++++----
src/pulse/internal.h | 3 +++
src/pulsecore/mem.h | 9 +++++++++
src/pulsecore/protocol-native.c | 28 ++++++++++++++++++++++++--
9 files changed, 101 insertions(+), 8 deletions(-)
diff --git a/PROTOCOL b/PROTOCOL
index 3c08fea..76cdd27 100644
--- a/PROTOCOL
+++ b/PROTOCOL
@@ -371,6 +371,18 @@ PA_COMMAND_DISABLE_SRBCHANNEL
Tells the client to stop listening on the additional SHM ringbuffer channel.
Acked by client by sending PA_COMMAND_DISABLE_SRBCHANNEL back.
+## v31, implemented by >= 9.0
+
+Second most-significant bit of the version tag is now used to flag memfd
+SHM support, for both client and server.
+
+The two most-significant bytes of the version tag are now also reserved for
+flags, for both client and server.
+
+Unless memfd support is compiled out or disabled by enable-memfd=no client
+option, clients now uses memfd SHM by default to transfer playback audio
+block references to the server.
+
#### If you just changed the protocol, read this
## module-tunnel depends on the sink/source/sink-input/source-input protocol
## internals, so if you changed these, you might have broken module-tunnel.
diff --git a/configure.ac b/configure.ac
index ee64988..3220c84 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ AC_SUBST(PA_MINOR, pa_minor)
AC_SUBST(PA_MAJORMINOR, pa_major.pa_minor)
AC_SUBST(PA_API_VERSION, 12)
-AC_SUBST(PA_PROTOCOL_VERSION, 30)
+AC_SUBST(PA_PROTOCOL_VERSION, 31)
# The stable ABI for client applications, for the version info x:y:z
# always will hold y=z
diff --git a/man/pulse-client.conf.5.xml.in b/man/pulse-client.conf.5.xml.in
index cca2219..b88898c 100644
--- a/man/pulse-client.conf.5.xml.in
+++ b/man/pulse-client.conf.5.xml.in
@@ -102,6 +102,14 @@ License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
<option>
<p><opt>enable-shm=</opt> Enable data transfer via POSIX
+ or memfd shared memory. Takes a boolean argument, defaults to
+ <opt>yes</opt>. If set to <opt>no</opt>, communication with
+ the server will be exclusively done through data-copy over
+ sockets.</p>
+ </option>
+
+ <option>
+ <p><opt>enable-memfd=</opt>. Enable data transfer via memfd
shared memory. Takes a boolean argument, defaults to
<opt>yes</opt>.</p>
</option>
diff --git a/src/pulse/client-conf.c b/src/pulse/client-conf.c
index c23aa6b..a3c9486 100644
--- a/src/pulse/client-conf.c
+++ b/src/pulse/client-conf.c
@@ -141,6 +141,7 @@ void pa_client_conf_load(pa_client_conf *c, bool load_from_x11, bool load_from_e
{ "cookie-file", pa_config_parse_string, &c->cookie_file_from_client_conf, NULL },
{ "disable-shm", pa_config_parse_bool, &c->disable_shm, NULL },
{ "enable-shm", pa_config_parse_not_bool, &c->disable_shm, NULL },
+ { "enable-memfd", pa_config_parse_not_bool, &c->disable_memfd, NULL },
{ "shm-size-bytes", pa_config_parse_size, &c->shm_size, NULL },
{ "auto-connect-localhost", pa_config_parse_bool, &c->auto_connect_localhost, NULL },
{ "auto-connect-display", pa_config_parse_bool, &c->auto_connect_display, NULL },
diff --git a/src/pulse/client-conf.h b/src/pulse/client-conf.h
index eac705a..7691ec7 100644
--- a/src/pulse/client-conf.h
+++ b/src/pulse/client-conf.h
@@ -37,7 +37,7 @@ typedef struct pa_client_conf {
bool cookie_from_x11_valid;
char *cookie_file_from_application;
char *cookie_file_from_client_conf;
- bool autospawn, disable_shm, auto_connect_localhost, auto_connect_display;
+ bool autospawn, disable_shm, disable_memfd, auto_connect_localhost, auto_connect_display;
size_t shm_size;
} pa_client_conf;
diff --git a/src/pulse/context.c b/src/pulse/context.c
index ef39416..69be5f4 100644
--- a/src/pulse/context.c
+++ b/src/pulse/context.c
@@ -173,7 +173,12 @@ pa_context *pa_context_new_with_proplist(pa_mainloop_api *mainloop, const char *
c->srb_template.readfd = -1;
c->srb_template.writefd = -1;
- type = !c->conf->disable_shm ? PA_MEM_TYPE_SHARED_POSIX : PA_MEM_TYPE_PRIVATE;
+ c->memfd_on_local = (!c->conf->disable_memfd && pa_memfd_is_locally_supported());
+
+ type = (c->conf->disable_shm) ? PA_MEM_TYPE_PRIVATE :
+ ((!c->memfd_on_local) ?
+ PA_MEM_TYPE_SHARED_POSIX : PA_MEM_TYPE_SHARED_MEMFD);
+
if (!(c->mempool = pa_mempool_new(type, c->conf->shm_size, true))) {
if (!c->conf->disable_shm) {
@@ -482,6 +487,7 @@ static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t
case PA_CONTEXT_AUTHORIZING: {
pa_tagstruct *reply;
bool shm_on_remote = false;
+ bool memfd_on_remote = false;
if (pa_tagstruct_getu32(t, &c->version) < 0 ||
!pa_tagstruct_eof(t)) {
@@ -500,7 +506,15 @@ static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t
not. */
if (c->version >= 13) {
shm_on_remote = !!(c->version & 0x80000000U);
- c->version &= 0x7FFFFFFFU;
+
+ /* Starting with protocol version 31, the second MSB of the version
+ * tag reflects whether memfd is supported on the other PA end. */
+ if (c->version >= 31)
+ memfd_on_remote = !!(c->version & 0x40000000U);
+
+ /* Reserve the two most-significant _bytes_ of the version tag
+ * for flags. */
+ c->version &= 0x0000FFFFU;
}
pa_log_debug("Protocol version: remote %u, local %u", c->version, PA_PROTOCOL_VERSION);
@@ -526,6 +540,26 @@ static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t
pa_log_debug("Negotiated SHM: %s", pa_yes_no(c->do_shm));
pa_pstream_enable_shm(c->pstream, c->do_shm);
+ c->shm_type = PA_MEM_TYPE_PRIVATE;
+ if (c->do_shm) {
+ if (c->version >= 31 && memfd_on_remote && c->memfd_on_local) {
+ const char *reason;
+
+ pa_pstream_enable_memfd(c->pstream);
+ if (pa_mempool_is_memfd_backed(c->mempool))
+ if (pa_pstream_register_memfd_mempool(c->pstream, c->mempool, &reason))
+ pa_log("Failed to regester memfd mempool. Reason: %s", reason);
+
+ /* Even if memfd pool registration fails, the negotiated SHM type
+ * shall remain memfd as both endpoints claim to support it. */
+ c->shm_type = PA_MEM_TYPE_SHARED_MEMFD;
+ } else
+ c->shm_type = PA_MEM_TYPE_SHARED_POSIX;
+ }
+
+ pa_log_debug("Memfd possible: %s", pa_yes_no(c->memfd_on_local));
+ pa_log_debug("Negotiated SHM type: %s", pa_mem_type_to_string(c->shm_type));
+
reply = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag);
if (c->version >= 13) {
@@ -593,8 +627,10 @@ static void setup_context(pa_context *c, pa_iochannel *io) {
pa_log_debug("SHM possible: %s", pa_yes_no(c->do_shm));
/* Starting with protocol version 13 we use the MSB of the version
- * tag for informing the other side if we could do SHM or not */
- pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION | (c->do_shm ? 0x80000000U : 0));
+ * tag for informing the other side if we could do SHM or not.
+ * Starting from version 31, second MSB is used to flag memfd support. */
+ pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION | (c->do_shm ? 0x80000000U : 0) |
+ (c->memfd_on_local ? 0x40000000 : 0));
pa_tagstruct_put_arbitrary(t, cookie, sizeof(cookie));
#ifdef HAVE_CREDS
diff --git a/src/pulse/internal.h b/src/pulse/internal.h
index eefd181..9bbb903 100644
--- a/src/pulse/internal.h
+++ b/src/pulse/internal.h
@@ -88,6 +88,7 @@ struct pa_context {
bool is_local:1;
bool do_shm:1;
+ bool memfd_on_local:1;
bool server_specified:1;
bool no_fail:1;
bool do_autospawn:1;
@@ -95,6 +96,8 @@ struct pa_context {
bool filter_added:1;
pa_spawn_api spawn_api;
+ pa_mem_type_t shm_type;
+
pa_strlist *server_list;
char *server;
diff --git a/src/pulsecore/mem.h b/src/pulsecore/mem.h
index 11a8086..cba1410 100644
--- a/src/pulsecore/mem.h
+++ b/src/pulsecore/mem.h
@@ -22,6 +22,7 @@
#include <stdbool.h>
+#include <pulsecore/creds.h>
#include <pulsecore/macro.h>
typedef enum pa_mem_type {
@@ -48,4 +49,12 @@ static inline bool pa_mem_type_is_shared(pa_mem_type_t t) {
return (t == PA_MEM_TYPE_SHARED_POSIX) || (t == PA_MEM_TYPE_SHARED_MEMFD);
}
+static inline bool pa_memfd_is_locally_supported() {
+#if defined(HAVE_CREDS) && defined(HAVE_MEMFD)
+ return true;
+#else
+ return false;
+#endif
+}
+
#endif
diff --git a/src/pulsecore/protocol-native.c b/src/pulsecore/protocol-native.c
index ffa5c4d..3f39431 100644
--- a/src/pulsecore/protocol-native.c
+++ b/src/pulsecore/protocol-native.c
@@ -48,6 +48,7 @@
#include <pulsecore/core-scache.h>
#include <pulsecore/core-subscribe.h>
#include <pulsecore/log.h>
+#include <pulsecore/mem.h>
#include <pulsecore/strlist.h>
#include <pulsecore/shared.h>
#include <pulsecore/sample-util.h>
@@ -2676,7 +2677,9 @@ static void command_enable_srbchannel(pa_pdispatch *pd, uint32_t command, uint32
static void command_auth(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
pa_native_connection *c = PA_NATIVE_CONNECTION(userdata);
const void*cookie;
+ bool memfd_on_remote = false;
pa_tagstruct *reply;
+ pa_mem_type_t shm_type;
bool shm_on_remote = false, do_shm;
pa_native_connection_assert_ref(c);
@@ -2700,7 +2703,15 @@ static void command_auth(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_ta
not. */
if (c->version >= 13) {
shm_on_remote = !!(c->version & 0x80000000U);
- c->version &= 0x7FFFFFFFU;
+
+ /* Starting with protocol version 31, the second MSB of the version
+ * tag reflects whether memfd is supported on the other PA end. */
+ if (c->version >= 31)
+ memfd_on_remote = !!(c->version & 0x40000000U);
+
+ /* Reserve the two most-significant _bytes_ of the version tag
+ * for flags. */
+ c->version &= 0x0000FFFFU;
}
pa_log_debug("Protocol version: remote %u, local %u", c->version, PA_PROTOCOL_VERSION);
@@ -2787,8 +2798,21 @@ static void command_auth(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_ta
pa_log_debug("Negotiated SHM: %s", pa_yes_no(do_shm));
pa_pstream_enable_shm(c->pstream, do_shm);
+ shm_type = PA_MEM_TYPE_PRIVATE;
+ if (do_shm) {
+ if (c->version >= 31 && memfd_on_remote && pa_memfd_is_locally_supported()) {
+ pa_pstream_enable_memfd(c->pstream);
+ shm_type = PA_MEM_TYPE_SHARED_MEMFD;
+ } else
+ shm_type = PA_MEM_TYPE_SHARED_POSIX;
+
+ pa_log_debug("Memfd possible: %s", pa_yes_no(pa_memfd_is_locally_supported()));
+ pa_log_debug("Negotiated SHM type: %s", pa_mem_type_to_string(shm_type));
+ }
+
reply = reply_new(tag);
- pa_tagstruct_putu32(reply, PA_PROTOCOL_VERSION | (do_shm ? 0x80000000 : 0));
+ pa_tagstruct_putu32(reply, PA_PROTOCOL_VERSION | (do_shm ? 0x80000000 : 0) |
+ (pa_memfd_is_locally_supported() ? 0x40000000 : 0));
#ifdef HAVE_CREDS
{
--
2.7.2
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