commit baced4def008b3b03f89eef3f9d6da34e38b5f2a
author David Klempner <klempner@google.com> Tue Feb 10 17:10:15 2015 -0800
committer David Klempner <klempner@google.com> Tue Feb 10 20:12:15 2015 -0800
tree 6a5c7678f0ad3b29468aaf016bcfe8955a10ff0e
parent a81196c36198e45dda98413b3917094db1967ae1

Epoll based multipoller

This is a multipoller based on epoll rather than poll.

Note that this implementation is aimed at correctness rather than
performance, although it should immediately have better scalability to
large numbers of FDs, both due to epoll's O(1) sized API and due to not
needing to wake up polling threads to do interest set changes.

One notable difference here is that we directly attach a wakeup fd
rather than using the freelisting kick mechanism that the poll() based
implementations use, because modifying the epoll set to use a different
kick fd each time isn't free.

Makefile

diff --git a/Makefile b/Makefile
index c411c07..8e0d649 100644
--- a/Makefile
+++ b/Makefile
@@ -1889,6 +1889,7 @@
     src/core/iomgr/iomgr_posix.c \
     src/core/iomgr/pollset_kick.c \
     src/core/iomgr/pollset_multipoller_with_poll_posix.c \
+    src/core/iomgr/pollset_multipoller_with_epoll.c \
     src/core/iomgr/pollset_posix.c \
     src/core/iomgr/pollset_windows.c \
     src/core/iomgr/resolve_address.c \
@@ -2018,6 +2019,7 @@
 src/core/iomgr/iomgr_posix.c: $(OPENSSL_DEP)
 src/core/iomgr/pollset_kick.c: $(OPENSSL_DEP)
 src/core/iomgr/pollset_multipoller_with_poll_posix.c: $(OPENSSL_DEP)
+src/core/iomgr/pollset_multipoller_with_epoll.c: $(OPENSSL_DEP)
 src/core/iomgr/pollset_posix.c: $(OPENSSL_DEP)
 src/core/iomgr/pollset_windows.c: $(OPENSSL_DEP)
 src/core/iomgr/resolve_address.c: $(OPENSSL_DEP)
@@ -2169,6 +2171,7 @@
 objs/$(CONFIG)/src/core/iomgr/iomgr_posix.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_kick.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_poll_posix.o: 
+objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_epoll.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_posix.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_windows.o: 
 objs/$(CONFIG)/src/core/iomgr/resolve_address.o: 
@@ -2404,6 +2407,7 @@
     src/core/iomgr/iomgr_posix.c \
     src/core/iomgr/pollset_kick.c \
     src/core/iomgr/pollset_multipoller_with_poll_posix.c \
+    src/core/iomgr/pollset_multipoller_with_epoll.c \
     src/core/iomgr/pollset_posix.c \
     src/core/iomgr/pollset_windows.c \
     src/core/iomgr/resolve_address.c \
@@ -2538,6 +2542,7 @@
 objs/$(CONFIG)/src/core/iomgr/iomgr_posix.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_kick.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_poll_posix.o: 
+objs/$(CONFIG)/src/core/iomgr/pollset_multipoller_with_epoll.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_posix.o: 
 objs/$(CONFIG)/src/core/iomgr/pollset_windows.o: 
 objs/$(CONFIG)/src/core/iomgr/resolve_address.o: