Author: trociny
Date: Tue Dec 10 20:06:41 2013
New Revision: 259195
URL: http://svnweb.freebsd.org/changeset/base/259195
Log:
Send wakeup to threads waiting on empty queue before releasing the
lock to decrease spurious wakeups.
Submitted by: davidxu
MFC after: 2 weeks
Modified:
head/sbin/hastd/primary.c
head/sbin/hastd/secondary.c
Modified: head/sbin/hastd/primary.c
==============================================================================
--- head/sbin/hastd/primary.c Tue Dec 10 20:05:07 2013 (r259194)
+++ head/sbin/hastd/primary.c Tue Dec 10 20:06:41 2013 (r259195)
@@ -180,27 +180,21 @@ static pthread_mutex_t metadata_lock;
((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL)
#define QUEUE_INSERT1(hio, name, ncomp) do {
\
- bool _wakeup; \
- \
mtx_lock(&hio_##name##_list_lock[(ncomp)]); \
- _wakeup = TAILQ_EMPTY(&hio_##name##_list[(ncomp)]); \
+ if (TAILQ_EMPTY(&hio_##name##_list[(ncomp)])) \
+ cv_broadcast(&hio_##name##_list_cond[(ncomp)]); \
TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \
hio_next[(ncomp)]); \
hio_##name##_list_size[(ncomp)]++; \
- mtx_unlock(&hio_##name##_list_lock[ncomp]); \
- if (_wakeup) \
- cv_broadcast(&hio_##name##_list_cond[(ncomp)]); \
+ mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \
} while (0)
#define QUEUE_INSERT2(hio, name) do {
\
- bool _wakeup; \
- \
mtx_lock(&hio_##name##_list_lock); \
- _wakeup = TAILQ_EMPTY(&hio_##name##_list); \
+ if (TAILQ_EMPTY(&hio_##name##_list)) \
+ cv_broadcast(&hio_##name##_list_cond); \
TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\
hio_##name##_list_size++; \
mtx_unlock(&hio_##name##_list_lock); \
- if (_wakeup) \
- cv_broadcast(&hio_##name##_list_cond); \
} while (0)
#define QUEUE_TAKE1(hio, name, ncomp, timeout) do {
\
bool _last; \
Modified: head/sbin/hastd/secondary.c
==============================================================================
--- head/sbin/hastd/secondary.c Tue Dec 10 20:05:07 2013 (r259194)
+++ head/sbin/hastd/secondary.c Tue Dec 10 20:06:41 2013 (r259195)
@@ -110,15 +110,12 @@ static void *disk_thread(void *arg);
static void *send_thread(void *arg);
#define QUEUE_INSERT(name, hio) do {
\
- bool _wakeup; \
- \
mtx_lock(&hio_##name##_list_lock); \
- _wakeup = TAILQ_EMPTY(&hio_##name##_list); \
+ if (TAILQ_EMPTY(&hio_##name##_list)) \
+ cv_broadcast(&hio_##name##_list_cond); \
TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \
hio_##name##_list_size++; \
mtx_unlock(&hio_##name##_list_lock); \
- if (_wakeup) \
- cv_broadcast(&hio_##name##_list_cond); \
} while (0)
#define QUEUE_TAKE(name, hio) do {
\
mtx_lock(&hio_##name##_list_lock); \
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