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ruby: message buffer: changes related to tracking push/pop times

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The last pop operation is now tracked as a Tick instead of in Cycles.
This helps in avoiding use of the receiver's clock during the enqueue
operation.
This commit is contained in:
Nilay Vaish 2014-03-01 23:59:58 -06:00
parent 67cd04b6fe
commit 5cd9dd29bd
2 changed files with 8 additions and 8 deletions
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10
src/mem/ruby/buffers/MessageBuffer.cc
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@ -89,11 +89,11 @@ MessageBuffer::areNSlotsAvailable(unsigned int n)
// size immediately
unsigned int current_size = 0;
if (m_time_last_time_pop < m_receiver->curCycle()) {
if (m_time_last_time_pop < m_sender->clockEdge()) {
// no pops this cycle - heap size is correct
current_size = m_prio_heap.size();
} else {
if (m_time_last_time_enqueue < m_receiver->curCycle()) {
if (m_time_last_time_enqueue < m_sender->curCycle()) {
// no enqueues this cycle - m_size_at_cycle_start is correct
current_size = m_size_at_cycle_start;
} else {
@ -242,9 +242,9 @@ MessageBuffer::dequeue()
// record previous size and time so the current buffer size isn't
// adjusted until next cycle
if (m_time_last_time_pop < m_receiver->curCycle()) {
if (m_time_last_time_pop < m_receiver->clockEdge()) {
m_size_at_cycle_start = m_prio_heap.size();
m_time_last_time_pop = m_receiver->curCycle();
m_time_last_time_pop = m_receiver->clockEdge();
}
pop_heap(m_prio_heap.begin(), m_prio_heap.end(),
@ -259,7 +259,7 @@ MessageBuffer::clear()
m_msg_counter = 0;
m_time_last_time_enqueue = Cycles(0);
m_time_last_time_pop = Cycles(0);
m_time_last_time_pop = 0;
m_size_at_cycle_start = 0;
m_msgs_this_cycle = 0;
}

6
src/mem/ruby/buffers/MessageBuffer.hh
View file

@ -186,7 +186,9 @@ class MessageBuffer
// variables used so enqueues appear to happen imediately, while
// pop happen the next cycle
Cycles m_time_last_time_enqueue;
Cycles m_time_last_time_pop;
Tick m_time_last_time_pop;
Tick m_last_arrival_time;
unsigned int m_size_at_cycle_start;
unsigned int m_msgs_this_cycle;
@ -198,8 +200,6 @@ class MessageBuffer
bool m_ordering_set;
bool m_randomization;
Tick m_last_arrival_time;
int m_input_link_id;
int m_vnet_id;
};