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authorhanlin <hanlin_wang@163.com>2020-05-19 17:34:17 +0800
committerFlorin Coras <florin.coras@gmail.com>2020-05-20 15:30:28 +0000
commit4266d4d5ff96043f6d2fbd217e97eddf8916e346 (patch)
tree4fcee312019fc21bc658e57fbf9c6898022a53d2 /src
parentcf755442670b9126b3f6aabe27c2bfb32179fafa (diff)
vcl: nest vcl_mq_epfd to support epoll_wait without high CPU usage
Now, libc epfd and vls epfd are independent and can only epoll_wait independently without timeout, then app calling epoll_wait will occupy high CPU. So we nest vcl_mq_epfd into libc epfd when using eventfd with VPP, and then we can only epoll_wait libc epfd with specified timeout. Type: feature Signed-off-by: hanlin <hanlin_wang@163.com> Change-Id: I6b6e0f501c769e186714bfbc187cfaed2533b4c2 Signed-off-by: hanlin <hanlin_wang@163.com>
Diffstat (limited to 'src')
-rw-r--r--src/vcl/ldp.c120
-rw-r--r--src/vcl/vcl_locked.c6
-rw-r--r--src/vcl/vcl_locked.h1
3 files changed, 125 insertions, 2 deletions
diff --git a/src/vcl/ldp.c b/src/vcl/ldp.c
index 091c7e5cff4..e3e6dfac1c6 100644
--- a/src/vcl/ldp.c
+++ b/src/vcl/ldp.c
@@ -80,6 +80,7 @@ typedef struct ldp_worker_ctx_
* Epoll state
*/
u8 epoll_wait_vcl;
+ u8 mq_epfd_added;
int vcl_mq_epfd;
} ldp_worker_ctx_t;
@@ -2344,17 +2345,132 @@ done:
return rv;
}
+static inline int
+ldp_epoll_pwait_eventfd (int epfd, struct epoll_event *events,
+ int maxevents, int timeout, const sigset_t * sigmask)
+{
+ ldp_worker_ctx_t *ldpw = ldp_worker_get_current ();
+ int libc_epfd, rv = 0, num_ev;
+ vls_handle_t ep_vlsh;
+
+ if ((errno = -ldp_init ()))
+ return -1;
+
+ if (PREDICT_FALSE (!events || (timeout < -1)))
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (epfd == ldpw->vcl_mq_epfd)
+ return libc_epoll_pwait (epfd, events, maxevents, timeout, sigmask);
+
+ ep_vlsh = ldp_fd_to_vlsh (epfd);
+ if (PREDICT_FALSE (ep_vlsh == VLS_INVALID_HANDLE))
+ {
+ LDBG (0, "epfd %d: bad ep_vlsh %d!", epfd, ep_vlsh);
+ errno = EBADFD;
+ return -1;
+ }
+
+ libc_epfd = vls_attr (ep_vlsh, VPPCOM_ATTR_GET_LIBC_EPFD, 0, 0);
+ if (PREDICT_FALSE (!libc_epfd))
+ {
+ u32 size = sizeof (epfd);
+
+ LDBG (1, "epfd %d, vep_vlsh %d calling libc_epoll_create1: "
+ "EPOLL_CLOEXEC", epfd, ep_vlsh);
+ libc_epfd = libc_epoll_create1 (EPOLL_CLOEXEC);
+ if (libc_epfd < 0)
+ {
+ rv = libc_epfd;
+ goto done;
+ }
+
+ rv = vls_attr (ep_vlsh, VPPCOM_ATTR_SET_LIBC_EPFD, &libc_epfd, &size);
+ if (rv < 0)
+ {
+ errno = -rv;
+ rv = -1;
+ goto done;
+ }
+ }
+ if (PREDICT_FALSE (libc_epfd <= 0))
+ {
+ errno = -libc_epfd;
+ rv = -1;
+ goto done;
+ }
+
+ if (PREDICT_FALSE (!ldpw->mq_epfd_added))
+ {
+ struct epoll_event e = { 0 };
+ e.events = EPOLLIN;
+ e.data.fd = ldpw->vcl_mq_epfd;
+ if (libc_epoll_ctl (libc_epfd, EPOLL_CTL_ADD, ldpw->vcl_mq_epfd, &e) <
+ 0)
+ {
+ LDBG (0, "epfd %d, add libc mq epoll fd %d to libc epoll fd %d",
+ epfd, ldpw->vcl_mq_epfd, libc_epfd);
+ rv = -1;
+ goto done;
+ }
+ ldpw->mq_epfd_added = 1;
+ }
+
+ rv = vls_epoll_wait (ep_vlsh, events, maxevents, 0);
+ if (rv > 0)
+ goto done;
+ else if (rv < 0)
+ {
+ errno = -rv;
+ rv = -1;
+ goto done;
+ }
+
+ rv = libc_epoll_pwait (libc_epfd, events, maxevents, timeout, sigmask);
+ if (rv <= 0)
+ goto done;
+ for (int i = 0; i < rv; i++)
+ {
+ if (events[i].data.fd == ldpw->vcl_mq_epfd)
+ {
+ /* We should remove mq epoll fd from events. */
+ rv--;
+ if (i != rv)
+ {
+ events[i].events = events[rv].events;
+ events[i].data.u64 = events[rv].data.u64;
+ }
+ num_ev = vls_epoll_wait (ep_vlsh, &events[rv], maxevents - rv, 0);
+ if (PREDICT_TRUE (num_ev > 0))
+ rv += num_ev;
+ break;
+ }
+ }
+
+done:
+ return rv;
+}
+
int
epoll_pwait (int epfd, struct epoll_event *events,
int maxevents, int timeout, const sigset_t * sigmask)
{
- return ldp_epoll_pwait (epfd, events, maxevents, timeout, sigmask);
+ if (vls_use_eventfd ())
+ return ldp_epoll_pwait_eventfd (epfd, events, maxevents, timeout,
+ sigmask);
+ else
+ return ldp_epoll_pwait (epfd, events, maxevents, timeout, sigmask);
}
int
epoll_wait (int epfd, struct epoll_event *events, int maxevents, int timeout)
{
- return ldp_epoll_pwait (epfd, events, maxevents, timeout, NULL);
+ if (vls_use_eventfd ())
+ return ldp_epoll_pwait_eventfd (epfd, events, maxevents, timeout, NULL);
+ else
+ return ldp_epoll_pwait (epfd, events, maxevents, timeout, NULL);
}
int
diff --git a/src/vcl/vcl_locked.c b/src/vcl/vcl_locked.c
index ae9c9762dc1..19522c05d61 100644
--- a/src/vcl/vcl_locked.c
+++ b/src/vcl/vcl_locked.c
@@ -1381,6 +1381,12 @@ vls_app_create (char *app_name)
return VPPCOM_OK;
}
+unsigned char
+vls_use_eventfd (void)
+{
+ return vcm->cfg.use_mq_eventfd;
+}
+
/*
* fd.io coding-style-patch-verification: ON
*
diff --git a/src/vcl/vcl_locked.h b/src/vcl/vcl_locked.h
index 2c8f2115230..18b341b11ca 100644
--- a/src/vcl/vcl_locked.h
+++ b/src/vcl/vcl_locked.h
@@ -50,6 +50,7 @@ vcl_session_handle_t vlsh_to_sh (vls_handle_t vlsh);
vcl_session_handle_t vlsh_to_session_index (vls_handle_t vlsh);
vls_handle_t vls_session_index_to_vlsh (uint32_t session_index);
int vls_app_create (char *app_name);
+unsigned char vls_use_eventfd (void);
#endif /* SRC_VCL_VCL_LOCKED_H_ */