[PATCH] Add epoll option for better performance
Masashi Honma
masashi.honma
Mon May 12 17:35:48 PDT 2014
> On its own, this does not seem to be changing anything, so I'm not going to
> apply it without some real justification showing how this is going to be
> used with the following changes (epoll).
This is the following patch.
Signed-off-by: Masashi Honma <masashi.honma at gmail.com>
---
src/utils/eloop.c | 175 ++++++++++++++++++++++++++++++++++++++----
wpa_supplicant/Android.mk | 4 +
wpa_supplicant/Makefile | 3 +
wpa_supplicant/android.config | 5 +-
wpa_supplicant/defconfig | 5 +-
5 files changed, 174 insertions(+), 18 deletions(-)
diff --git a/src/utils/eloop.c b/src/utils/eloop.c
index a788260..68c3b8c 100644
--- a/src/utils/eloop.c
+++ b/src/utils/eloop.c
@@ -14,14 +14,21 @@
#include "list.h"
#include "eloop.h"
-#ifndef CONFIG_ELOOP_POLL
+#if defined(CONFIG_ELOOP_POLL) && defined(CONFIG_ELOOP_EPOLL)
+#error Do not define both of poll and epoll
+#endif
+
+#if !defined(CONFIG_ELOOP_POLL) && !defined(CONFIG_ELOOP_EPOLL)
#define CONFIG_ELOOP_SELECT
-#endif /* CONFIG_ELOOP_POLL */
+#endif
#ifdef CONFIG_ELOOP_POLL
#include <poll.h>
#endif /* CONFIG_ELOOP_POLL */
+#ifdef CONFIG_ELOOP_EPOLL
+#include <sys/epoll.h>
+#endif /* CONFIG_ELOOP_EPOLL */
struct eloop_sock {
int sock;
@@ -54,7 +61,11 @@ struct eloop_signal {
struct eloop_sock_table {
int count;
struct eloop_sock *table;
+#ifdef CONFIG_ELOOP_EPOLL
+ eloop_event_type type;
+#else /* CONFIG_ELOOP_EPOLL */
int changed;
+#endif /* CONFIG_ELOOP_EPOLL */
};
struct eloop_data {
@@ -67,6 +78,13 @@ struct eloop_data {
struct pollfd *pollfds;
struct pollfd **pollfds_map;
#endif /* CONFIG_ELOOP_POLL */
+#ifdef CONFIG_ELOOP_EPOLL
+ int epollfd;
+ int epoll_max_event_num;
+ int epoll_max_fd;
+ struct eloop_sock *epoll_table;
+ struct epoll_event *epoll_events;
+#endif /* CONFIG_ELOOP_EPOLL */
struct eloop_sock_table readers;
struct eloop_sock_table writers;
struct eloop_sock_table exceptions;
@@ -79,7 +97,6 @@ struct eloop_data {
int pending_terminate;
int terminate;
- int reader_table_changed;
};
static struct eloop_data eloop;
@@ -132,6 +149,17 @@ int eloop_init(void)
{
os_memset(&eloop, 0, sizeof(eloop));
dl_list_init(&eloop.timeout);
+#ifdef CONFIG_ELOOP_EPOLL
+ eloop.epollfd = epoll_create1(0);
+ if (eloop.epollfd < 0) {
+ wpa_printf(MSG_ERROR, "%s: epoll_create1 failed. %s\n",
+ __func__, strerror(errno));
+ return -1;
+ }
+ eloop.readers.type = EVENT_TYPE_READ;
+ eloop.writers.type = EVENT_TYPE_WRITE;
+ eloop.exceptions.type = EVENT_TYPE_EXCEPTION;
+#endif /* CONFIG_ELOOP_EPOLL */
#ifdef WPA_TRACE
signal(SIGSEGV, eloop_sigsegv_handler);
#endif /* WPA_TRACE */
@@ -143,6 +171,11 @@ static int eloop_sock_table_add_sock(struct eloop_sock_table *table,
int sock, eloop_sock_handler handler,
void *eloop_data, void *user_data)
{
+#ifdef CONFIG_ELOOP_EPOLL
+ struct eloop_sock *temp_table;
+ struct epoll_event ev, *temp_events;
+ int next;
+#endif /* CONFIG_ELOOP_EPOLL */
struct eloop_sock *tmp;
int new_max_sock;
@@ -178,6 +211,33 @@ static int eloop_sock_table_add_sock(struct eloop_sock_table *table,
eloop.pollfds = n;
}
#endif /* CONFIG_ELOOP_POLL */
+#ifdef CONFIG_ELOOP_EPOLL
+ if (new_max_sock >= eloop.epoll_max_fd) {
+ next = eloop.epoll_max_fd == 0 ? 16 : eloop.epoll_max_fd * 2;
+ temp_table = os_realloc_array(eloop.epoll_table, next,
+ sizeof(struct eloop_sock));
+ if (temp_table == NULL)
+ return -1;
+
+ eloop.epoll_max_fd = next;
+ eloop.epoll_table = temp_table;
+ }
+
+ if (eloop.count + 1 > eloop.epoll_max_event_num) {
+ next = eloop.epoll_max_event_num == 0 ? 8 :
+ eloop.epoll_max_event_num * 2;
+ temp_events = os_realloc_array(eloop.epoll_events, next,
+ sizeof(struct epoll_event));
+ if (temp_events == NULL) {
+ wpa_printf(MSG_ERROR, "%s: malloc for epoll failed. "
+ "%s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ eloop.epoll_max_event_num = next;
+ eloop.epoll_events = temp_events;
+ }
+#endif /* CONFIG_ELOOP_EPOLL */
eloop_trace_sock_remove_ref(table);
tmp = os_realloc_array(table->table, table->count + 1,
@@ -194,9 +254,38 @@ static int eloop_sock_table_add_sock(struct eloop_sock_table *table,
table->table = tmp;
eloop.max_sock = new_max_sock;
eloop.count++;
+#ifndef CONFIG_ELOOP_EPOLL
table->changed = 1;
+#endif /* CONFIG_ELOOP_EPOLL */
eloop_trace_sock_add_ref(table);
+#ifdef CONFIG_ELOOP_EPOLL
+ os_memset(&ev, 0, sizeof(ev));
+ switch (table->type) {
+ case EVENT_TYPE_READ:
+ ev.events = EPOLLIN;
+ break;
+ case EVENT_TYPE_WRITE:
+ ev.events = EPOLLOUT;
+ break;
+ /*
+ * Exceptions are always checked when using epoll, but I suppose it's
+ * possible that someone registered a socket *only* for exception
+ * handling.
+ */
+ case EVENT_TYPE_EXCEPTION:
+ ev.events = EPOLLERR | EPOLLHUP;
+ break;
+ }
+ ev.data.fd = sock;
+ if (epoll_ctl(eloop.epollfd, EPOLL_CTL_ADD, sock, &ev) < 0) {
+ wpa_printf(MSG_ERROR, "%s: epoll_ctl(ADD) for fd=%d "
+ "failed. %s\n", __func__, sock, strerror(errno));
+ return -1;
+ }
+ os_memcpy(&eloop.epoll_table[sock], &table->table[table->count - 1],
+ sizeof(struct eloop_sock));
+#endif /* CONFIG_ELOOP_EPOLL */
return 0;
}
@@ -223,8 +312,18 @@ static void eloop_sock_table_remove_sock(struct eloop_sock_table *table,
}
table->count--;
eloop.count--;
+#ifndef CONFIG_ELOOP_EPOLL
table->changed = 1;
+#endif /* CONFIG_ELOOP_EPOLL */
eloop_trace_sock_add_ref(table);
+#ifdef CONFIG_ELOOP_EPOLL
+ if (epoll_ctl(eloop.epollfd, EPOLL_CTL_DEL, sock, NULL) < 0) {
+ wpa_printf(MSG_ERROR, "%s: epoll_ctl(DEL) for fd=%d "
+ "failed. %s\n", __func__, sock, strerror(errno));
+ return;
+ }
+ os_memset(&eloop.epoll_table[sock], 0, sizeof(struct eloop_sock));
+#endif /* CONFIG_ELOOP_EPOLL */
}
@@ -410,6 +509,23 @@ static void eloop_sock_table_dispatch(struct eloop_sock_table *table,
#endif /* CONFIG_ELOOP_SELECT */
+#ifdef CONFIG_ELOOP_EPOLL
+static void eloop_sock_table_dispatch(struct epoll_event *events, int nfds)
+{
+ struct eloop_sock *table;
+ int i;
+
+ for (i = 0; i < nfds; i++) {
+ table = &eloop.epoll_table[events[i].data.fd];
+ if (table->handler == NULL)
+ continue;
+ table->handler(table->sock, table->eloop_data,
+ table->user_data);
+ }
+}
+#endif /* CONFIG_ELOOP_EPOLL */
+
+
static void eloop_sock_table_destroy(struct eloop_sock_table *table)
{
if (table) {
@@ -787,6 +903,9 @@ void eloop_run(void)
fd_set *rfds, *wfds, *efds;
struct timeval _tv;
#endif /* CONFIG_ELOOP_SELECT */
+#ifdef CONFIG_ELOOP_EPOLL
+ int timeout_ms = -1;
+#endif /* CONFIG_ELOOP_EPOLL */
int res;
struct os_reltime tv, now;
@@ -810,9 +929,9 @@ void eloop_run(void)
os_reltime_sub(&timeout->time, &now, &tv);
else
tv.sec = tv.usec = 0;
-#ifdef CONFIG_ELOOP_POLL
+#if defined(CONFIG_ELOOP_POLL) || defined(CONFIG_ELOOP_EPOLL)
timeout_ms = tv.sec * 1000 + tv.usec / 1000;
-#endif /* CONFIG_ELOOP_POLL */
+#endif /* defined(CONFIG_ELOOP_POLL) || defined(CONFIG_ELOOP_EPOLL) */
#ifdef CONFIG_ELOOP_SELECT
_tv.tv_sec = tv.sec;
_tv.tv_usec = tv.usec;
@@ -826,12 +945,6 @@ void eloop_run(void)
eloop.max_pollfd_map);
res = poll(eloop.pollfds, num_poll_fds,
timeout ? timeout_ms : -1);
-
- if (res < 0 && errno != EINTR && errno != 0) {
- wpa_printf(MSG_INFO, "eloop: poll: %s",
- strerror(errno));
- goto out;
- }
#endif /* CONFIG_ELOOP_POLL */
#ifdef CONFIG_ELOOP_SELECT
eloop_sock_table_set_fds(&eloop.readers, rfds);
@@ -839,12 +952,29 @@ void eloop_run(void)
eloop_sock_table_set_fds(&eloop.exceptions, efds);
res = select(eloop.max_sock + 1, rfds, wfds, efds,
timeout ? &_tv : NULL);
+#endif /* CONFIG_ELOOP_SELECT */
+#ifdef CONFIG_ELOOP_EPOLL
+ if (eloop.count == 0) {
+ res = 0;
+ } else {
+ res = epoll_wait(eloop.epollfd, eloop.epoll_events,
+ eloop.count, timeout_ms);
+ }
+#endif /* CONFIG_ELOOP_EPOLL */
if (res < 0 && errno != EINTR && errno != 0) {
- wpa_printf(MSG_INFO, "eloop: select: %s",
- strerror(errno));
+ wpa_printf(MSG_ERROR, "eloop: %s: %s",
+#ifdef CONFIG_ELOOP_POLL
+ "poll"
+#endif /* CONFIG_ELOOP_POLL */
+#ifdef CONFIG_ELOOP_SELECT
+ "select"
+#endif /* CONFIG_ELOOP_SELECT */
+#ifdef CONFIG_ELOOP_EPOLL
+ "epoll"
+#endif /* CONFIG_ELOOP_EPOLL */
+ , strerror(errno));
goto out;
}
-#endif /* CONFIG_ELOOP_SELECT */
eloop_process_pending_signals();
/* check if some registered timeouts have occurred */
@@ -876,6 +1006,9 @@ void eloop_run(void)
eloop_sock_table_dispatch(&eloop.writers, wfds);
eloop_sock_table_dispatch(&eloop.exceptions, efds);
#endif /* CONFIG_ELOOP_SELECT */
+#ifdef CONFIG_ELOOP_EPOLL
+ eloop_sock_table_dispatch(eloop.epoll_events, res);
+#endif /* CONFIG_ELOOP_EPOLL */
}
eloop.terminate = 0;
@@ -928,6 +1061,11 @@ void eloop_destroy(void)
os_free(eloop.pollfds);
os_free(eloop.pollfds_map);
#endif /* CONFIG_ELOOP_POLL */
+#ifdef CONFIG_ELOOP_EPOLL
+ os_free(eloop.epoll_table);
+ os_free(eloop.epoll_events);
+ close(eloop.epollfd);
+#endif /* CONFIG_ELOOP_EPOLL */
}
@@ -951,7 +1089,12 @@ void eloop_wait_for_read_sock(int sock)
poll(&pfd, 1, -1);
#endif /* CONFIG_ELOOP_POLL */
-#ifdef CONFIG_ELOOP_SELECT
+#if defined(CONFIG_ELOOP_SELECT) || defined(CONFIG_ELOOP_EPOLL)
+ /*
+ * We can use epoll() here. But epoll() requres 4 system calls.
+ * epoll_create1(), epoll_ctl() for ADD, epoll_wait, and close() for
+ * epoll fd. So select() is better for performance here.
+ */
fd_set rfds;
if (sock < 0)
@@ -960,7 +1103,7 @@ void eloop_wait_for_read_sock(int sock)
FD_ZERO(&rfds);
FD_SET(sock, &rfds);
select(sock + 1, &rfds, NULL, NULL, NULL);
-#endif /* CONFIG_ELOOP_SELECT */
+#endif /* defined(CONFIG_ELOOP_SELECT) || defined(CONFIG_ELOOP_EPOLL) */
}
#ifdef CONFIG_ELOOP_SELECT
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index a60a26a..369119d 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -140,6 +140,10 @@ ifdef CONFIG_ELOOP_POLL
L_CFLAGS += -DCONFIG_ELOOP_POLL
endif
+ifdef CONFIG_ELOOP_EPOLL
+L_CFLAGS += -DCONFIG_ELOOP_EPOLL
+endif
+
ifdef CONFIG_EAPOL_TEST
L_CFLAGS += -Werror -DEAPOL_TEST
endif
diff --git a/wpa_supplicant/Makefile b/wpa_supplicant/Makefile
index 19dae70..9b46661 100644
--- a/wpa_supplicant/Makefile
+++ b/wpa_supplicant/Makefile
@@ -138,6 +138,9 @@ ifdef CONFIG_ELOOP_POLL
CFLAGS += -DCONFIG_ELOOP_POLL
endif
+ifdef CONFIG_ELOOP_EPOLL
+CFLAGS += -DCONFIG_ELOOP_EPOLL
+endif
ifdef CONFIG_EAPOL_TEST
CFLAGS += -Werror -DEAPOL_TEST
diff --git a/wpa_supplicant/android.config b/wpa_supplicant/android.config
index ffa2f01..3ed734d 100644
--- a/wpa_supplicant/android.config
+++ b/wpa_supplicant/android.config
@@ -237,7 +237,7 @@ CONFIG_BACKEND=file
# main_none = Very basic example (development use only)
#CONFIG_MAIN=main
-# Select wrapper for operatins system and C library specific functions
+# Select wrapper for operating system and C library specific functions
# unix = UNIX/POSIX like systems (default)
# win32 = Windows systems
# none = Empty template
@@ -251,6 +251,9 @@ CONFIG_ELOOP=eloop
# Should we use poll instead of select? Select is used by default.
#CONFIG_ELOOP_POLL=y
+# Should we use epoll instead of select? Select is used by default.
+#CONFIG_ELOOP_EPOLL=y
+
# Select layer 2 packet implementation
# linux = Linux packet socket (default)
# pcap = libpcap/libdnet/WinPcap
diff --git a/wpa_supplicant/defconfig b/wpa_supplicant/defconfig
index d194eb8..94c94b1 100644
--- a/wpa_supplicant/defconfig
+++ b/wpa_supplicant/defconfig
@@ -253,7 +253,7 @@ CONFIG_BACKEND=file
# main_none = Very basic example (development use only)
#CONFIG_MAIN=main
-# Select wrapper for operatins system and C library specific functions
+# Select wrapper for operating system and C library specific functions
# unix = UNIX/POSIX like systems (default)
# win32 = Windows systems
# none = Empty template
@@ -267,6 +267,9 @@ CONFIG_BACKEND=file
# Should we use poll instead of select? Select is used by default.
#CONFIG_ELOOP_POLL=y
+# Should we use epoll instead of select? Select is used by default.
+#CONFIG_ELOOP_EPOLL=y
+
# Select layer 2 packet implementation
# linux = Linux packet socket (default)
# pcap = libpcap/libdnet/WinPcap
--
1.8.1.2
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