[SCM] Samba Shared Repository - branch master updated
Volker Lendecke
vlendec at samba.org
Mon Nov 5 11:02:03 MST 2012
The branch, master has been updated
via c2ca9e0 s3:vfs_default: optimize vfswrap_asys_finished() and read as much as we can
via 719595b lib/tsocket: optimize syscalls in tstream_readv_pdu_send()
via e42889f lib/tsocket: disable the syscall optimization for recvfrom/readv by default
from 71e1c08 libads: Always free the talloc_stackframe() on error path
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=master
- Log -----------------------------------------------------------------
commit c2ca9e02106108c024b0daf27325e8eba35437f2
Author: Stefan Metzmacher <metze at samba.org>
Date: Fri Nov 2 12:52:51 2012 +0100
s3:vfs_default: optimize vfswrap_asys_finished() and read as much as we can
Signed-off-by: Stefan Metzmacher <metze at samba.org>
Autobuild-User(master): Volker Lendecke <vl at samba.org>
Autobuild-Date(master): Mon Nov 5 19:01:13 CET 2012 on sn-devel-104
commit 719595b6f7f8745f2608dddb2b86476b9cc2f598
Author: Stefan Metzmacher <metze at samba.org>
Date: Fri Nov 2 13:56:53 2012 +0100
lib/tsocket: optimize syscalls in tstream_readv_pdu_send()
Once we've got the first part of a pdu we try to optimize
readv calls for the rest of the pdu.
Signed-off-by: Stefan Metzmacher <metze at samba.org>
commit e42889f83f261e2ac34014649476fae638a6e1f2
Author: Stefan Metzmacher <metze at samba.org>
Date: Fri Nov 2 13:45:49 2012 +0100
lib/tsocket: disable the syscall optimization for recvfrom/readv by default
We only do the optimization on recvfrom/readv if the caller asked for it.
This is needed because in most cases we preferr to flush send
buffers before receiving incoming requests.
Signed-off-by: Stefan Metzmacher <metze at samba.org>
-----------------------------------------------------------------------
Summary of changes:
lib/tsocket/tsocket.h | 42 +++++++++++++++++++++++
lib/tsocket/tsocket_bsd.c | 73 +++++++++++++++++++++++++++++++++++++---
lib/tsocket/tsocket_helpers.c | 29 ++++++++++++++++
source3/modules/vfs_default.c | 49 ++++++++++++++++++---------
4 files changed, 171 insertions(+), 22 deletions(-)
Changeset truncated at 500 lines:
diff --git a/lib/tsocket/tsocket.h b/lib/tsocket/tsocket.h
index 3aca536..98f864e 100644
--- a/lib/tsocket/tsocket.h
+++ b/lib/tsocket/tsocket.h
@@ -627,6 +627,27 @@ int _tsocket_address_unix_from_path(TALLOC_CTX *mem_ctx,
char *tsocket_address_unix_path(const struct tsocket_address *addr,
TALLOC_CTX *mem_ctx);
+/**
+ * @brief Request a syscall optimization for tdgram_recvfrom_send()
+ *
+ * This function is only used to reduce the amount of syscalls and
+ * optimize performance. You should only use this if you know
+ * what you're doing.
+ *
+ * The optimization is off by default.
+ *
+ * @param[in] dgram The tdgram_context of a bsd socket, if this
+ * not a bsd socket the function does nothing.
+ *
+ * @param[in] on The boolean value to turn the optimization on and off.
+ *
+ * @return The old boolean value.
+ *
+ * @see tdgram_recvfrom_send()
+ */
+bool tdgram_bsd_optimize_recvfrom(struct tdgram_context *dgram,
+ bool on);
+
#ifdef DOXYGEN
/**
* @brief Create a tdgram_context for a ipv4 or ipv6 UDP communication.
@@ -689,6 +710,27 @@ int _tdgram_unix_socket(const struct tsocket_address *local,
#endif
/**
+ * @brief Request a syscall optimization for tstream_readv_send()
+ *
+ * This function is only used to reduce the amount of syscalls and
+ * optimize performance. You should only use this if you know
+ * what you're doing.
+ *
+ * The optimization is off by default.
+ *
+ * @param[in] stream The tstream_context of a bsd socket, if this
+ * not a bsd socket the function does nothing.
+ *
+ * @param[in] on The boolean value to turn the optimization on and off.
+ *
+ * @return The old boolean value.
+ *
+ * @see tstream_readv_send()
+ */
+bool tstream_bsd_optimize_readv(struct tstream_context *stream,
+ bool on);
+
+/**
* @brief Connect async to a TCP endpoint and create a tstream_context for the
* stream based communication.
*
diff --git a/lib/tsocket/tsocket_bsd.c b/lib/tsocket/tsocket_bsd.c
index 135fd02..56dff68 100644
--- a/lib/tsocket/tsocket_bsd.c
+++ b/lib/tsocket/tsocket_bsd.c
@@ -654,6 +654,7 @@ struct tdgram_bsd {
void *event_ptr;
struct tevent_fd *fde;
+ bool optimize_recvfrom;
void *readable_private;
void (*readable_handler)(void *private_data);
@@ -661,6 +662,25 @@ struct tdgram_bsd {
void (*writeable_handler)(void *private_data);
};
+bool tdgram_bsd_optimize_recvfrom(struct tdgram_context *dgram,
+ bool on)
+{
+ struct tdgram_bsd *bsds =
+ talloc_get_type(_tdgram_context_data(dgram),
+ struct tdgram_bsd);
+ bool old;
+
+ if (bsds == NULL) {
+ /* not a bsd socket */
+ return false;
+ }
+
+ old = bsds->optimize_recvfrom;
+ bsds->optimize_recvfrom = on;
+
+ return old;
+}
+
static void tdgram_bsd_fde_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags,
@@ -838,14 +858,25 @@ static struct tevent_req *tdgram_bsd_recvfrom_send(TALLOC_CTX *mem_ctx,
goto post;
}
+
/*
* this is a fast path, not waiting for the
* socket to become explicit readable gains
* about 10%-20% performance in benchmark tests.
*/
- tdgram_bsd_recvfrom_handler(req);
- if (!tevent_req_is_in_progress(req)) {
- goto post;
+ if (bsds->optimize_recvfrom) {
+ /*
+ * We only do the optimization on
+ * recvfrom if the caller asked for it.
+ *
+ * This is needed because in most cases
+ * we preferr to flush send buffers before
+ * receiving incoming requests.
+ */
+ tdgram_bsd_recvfrom_handler(req);
+ if (!tevent_req_is_in_progress(req)) {
+ goto post;
+ }
}
ret = tdgram_bsd_set_readable_handler(bsds, ev,
@@ -1405,6 +1436,7 @@ struct tstream_bsd {
void *event_ptr;
struct tevent_fd *fde;
+ bool optimize_readv;
void *readable_private;
void (*readable_handler)(void *private_data);
@@ -1412,6 +1444,25 @@ struct tstream_bsd {
void (*writeable_handler)(void *private_data);
};
+bool tstream_bsd_optimize_readv(struct tstream_context *stream,
+ bool on)
+{
+ struct tstream_bsd *bsds =
+ talloc_get_type(_tstream_context_data(stream),
+ struct tstream_bsd);
+ bool old;
+
+ if (bsds == NULL) {
+ /* not a bsd socket */
+ return false;
+ }
+
+ old = bsds->optimize_readv;
+ bsds->optimize_readv = on;
+
+ return old;
+}
+
static void tstream_bsd_fde_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags,
@@ -1624,9 +1675,19 @@ static struct tevent_req *tstream_bsd_readv_send(TALLOC_CTX *mem_ctx,
* socket to become explicit readable gains
* about 10%-20% performance in benchmark tests.
*/
- tstream_bsd_readv_handler(req);
- if (!tevent_req_is_in_progress(req)) {
- goto post;
+ if (bsds->optimize_readv) {
+ /*
+ * We only do the optimization on
+ * readv if the caller asked for it.
+ *
+ * This is needed because in most cases
+ * we preferr to flush send buffers before
+ * receiving incoming requests.
+ */
+ tstream_bsd_readv_handler(req);
+ if (!tevent_req_is_in_progress(req)) {
+ goto post;
+ }
}
ret = tstream_bsd_set_readable_handler(bsds, ev,
diff --git a/lib/tsocket/tsocket_helpers.c b/lib/tsocket/tsocket_helpers.c
index 1b92b9f..49c6840 100644
--- a/lib/tsocket/tsocket_helpers.c
+++ b/lib/tsocket/tsocket_helpers.c
@@ -215,6 +215,20 @@ static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req)
size_t to_read = 0;
size_t i;
struct tevent_req *subreq;
+ bool optimize = false;
+ bool save_optimize = false;
+
+ if (state->count > 0) {
+ /*
+ * This is not the first time we asked for a vector,
+ * which means parts of the pdu already arrived.
+ *
+ * In this case it make sense to enable
+ * a syscall/performance optimization if the
+ * low level tstream implementation supports it.
+ */
+ optimize = true;
+ }
TALLOC_FREE(state->vector);
state->count = 0;
@@ -258,11 +272,26 @@ static void tstream_readv_pdu_ask_for_next_vector(struct tevent_req *req)
return;
}
+ if (optimize) {
+ /*
+ * If the low level stream is a bsd socket
+ * we will get syscall optimization.
+ *
+ * If it is not a bsd socket
+ * tstream_bsd_optimize_readv() just returns.
+ */
+ save_optimize = tstream_bsd_optimize_readv(state->caller.stream,
+ true);
+ }
subreq = tstream_readv_send(state,
state->caller.ev,
state->caller.stream,
state->vector,
state->count);
+ if (optimize) {
+ tstream_bsd_optimize_readv(state->caller.stream,
+ save_optimize);
+ }
if (tevent_req_nomem(subreq, req)) {
return;
}
diff --git a/source3/modules/vfs_default.c b/source3/modules/vfs_default.c
index 8e980e0..0f651dc 100644
--- a/source3/modules/vfs_default.c
+++ b/source3/modules/vfs_default.c
@@ -637,6 +637,7 @@ static void vfswrap_asys_finished(struct tevent_context *ev,
static bool vfswrap_init_asys_ctx(struct smbXsrv_connection *conn)
{
int ret;
+ int fd;
if (conn->asys_ctx != NULL) {
return true;
@@ -646,8 +647,12 @@ static bool vfswrap_init_asys_ctx(struct smbXsrv_connection *conn)
DEBUG(1, ("asys_context_init failed: %s\n", strerror(ret)));
return false;
}
- conn->asys_fde = tevent_add_fd(conn->ev_ctx, conn,
- asys_signalfd(conn->asys_ctx),
+
+ fd = asys_signalfd(conn->asys_ctx);
+
+ set_blocking(fd, false);
+
+ conn->asys_fde = tevent_add_fd(conn->ev_ctx, conn, fd,
TEVENT_FD_READ,
vfswrap_asys_finished,
conn->asys_ctx);
@@ -783,24 +788,36 @@ static void vfswrap_asys_finished(struct tevent_context *ev,
return;
}
- res = asys_result(asys_ctx, &ret, &err, &private_data);
- if (res == ECANCELED) {
- return;
- }
+ while (true) {
+ res = asys_result(asys_ctx, &ret, &err, &private_data);
+ if (res == EINTR || res == EAGAIN) {
+ return;
+ }
+#ifdef EWOULDBLOCK
+ if (res == EWOULDBLOCK) {
+ return;
+ }
+#endif
- if (res != 0) {
- DEBUG(1, ("asys_result returned %s\n", strerror(res)));
- return;
- }
+ if (res == ECANCELED) {
+ return;
+ }
- req = talloc_get_type_abort(private_data, struct tevent_req);
- state = tevent_req_data(req, struct vfswrap_asys_state);
+ if (res != 0) {
+ DEBUG(1, ("asys_result returned %s\n", strerror(res)));
+ return;
+ }
+
+ req = talloc_get_type_abort(private_data, struct tevent_req);
+ state = tevent_req_data(req, struct vfswrap_asys_state);
- talloc_set_destructor(state, NULL);
+ talloc_set_destructor(state, NULL);
- state->ret = ret;
- state->err = err;
- tevent_req_done(req);
+ state->ret = ret;
+ state->err = err;
+ tevent_req_defer_callback(req, ev);
+ tevent_req_done(req);
+ }
}
static ssize_t vfswrap_asys_ssize_t_recv(struct tevent_req *req, int *err)
--
Samba Shared Repository
More information about the samba-cvs
mailing list