Add event tracing candidates to ROADMAP.md #1
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Aug 16, 2016
By having the group_count load in CategoryRegistry::getStatus
be memory_order_acquire we avoid a benign TSan race (TSan
cannot introspect that group_count is always valid even when
stale so requires the memory barrier to force it to realise
it's always valid).
WARNING: ThreadSanitizer: data race (pid=90501)
Read of size 8 at 0x7d0c00005028 by thread T4 (mutexes: write M4934):
#0 strcmp <null> (memcached+0x0000004781d0)
#1 phosphor::CategoryRegistry::getStatus(char const*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/phosphor/src/category_registry.cc:40 (libphosphor.so+0x0000000072f2)
#2 phosphor::TraceLog::getCategoryStatus(char const*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/phosphor/src/trace_log.cc:359 (libphosphor.so+0x0000000130e5)
#3 McbpConnection::runStateMachinery() /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connection_mcbp.cc:997 (memcached+0x0000004ff393)
#4 McbpConnection::runEventLoop(short) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connection_mcbp.cc:1274 (memcached+0x000000500800)
#5 run_event_loop /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connections.cc:153 (memcached+0x0000005021c6)
#6 event_handler(int, short, void*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/memcached.cc:941 (memcached+0x0000004d19b3)
#7 event_base_loop <null> (libevent_core-2.0.so.5+0x00000000b357)
#8 platform_thread_wrap(void*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/platform/src/cb_pthreads.cc:54 (libplatform.so.0.1.0+0x00000000586b)
Previous write of size 8 at 0x7d0c00005028 by thread T3 (mutexes: write M4931, write M5242):
#0 operator new(unsigned long) <null> (memcached+0x00000046993d)
#1 <null> <null> (libstdc++.so.6+0x0000000c0568)
#2 phosphor::TraceLog::getCategoryStatus(char const*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/phosphor/src/trace_log.cc:359 (libphosphor.so+0x0000000130e5)
#3 McbpConnection::runStateMachinery() /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connection_mcbp.cc:997 (memcached+0x0000004ff393)
#4 McbpConnection::runEventLoop(short) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connection_mcbp.cc:1274 (memcached+0x000000500800)
#5 run_event_loop /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/connections.cc:153 (memcached+0x0000005021c6)
#6 event_handler(int, short, void*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/memcached/daemon/memcached.cc:941 (memcached+0x0000004d19b3)
#7 event_base_loop <null> (libevent_core-2.0.so.5+0x00000000b357)
#8 platform_thread_wrap(void*) /home/couchbase/jenkins/workspace/memcached-threadsanitizer-master/platform/src/cb_pthreads.cc:54 (libplatform.so.0.1.0+0x00000000586b)
Change-Id: I80c52ccf9467b5c9f6b836d1ff4f961d3cb094ce
Reviewed-on: http://review.couchbase.org/66796
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Dave Rigby <daver@couchbase.com>
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