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ircd::fs::aio: Reduce nr of modulo for completion ring iteration.

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This commit is contained in:
Jason Volk 2019-04-05 17:10:09 -07:00
parent 9d8fe82126
commit c3b9e2fca4
1 changed files with 5 additions and 4 deletions
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9
ircd/fs_aio.cc
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@ -261,10 +261,11 @@ ircd::fs::aio::write(const fd &fd,
bool
ircd::fs::aio::for_each_completed(const std::function<bool (const request &)> &closure)
{
assert(system);
const size_t max(system->max_events());
for(size_t i(system->head->head % max); i != system->head->tail % max; ++i %= max)
if(!closure(*reinterpret_cast<const request *>(system->ring[i].data)))
assert(system && system->head);
const size_t max(system->head->nr);
std::atomic_signal_fence(std::memory_order_acquire);
for(auto i(system->head->head); i != system->head->tail; ++i)
if(!closure(*reinterpret_cast<const request *>(system->ring[i % max].data)))
return false;
return true;