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ircd::fs::aio: Optimize system call pattern; eliminate exclusive calls to poll(2).

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This commit is contained in:
Jason Volk 2020-12-11 22:16:28 -08:00
parent 6696693f8b
commit b54d4950cc
1 changed files with 14 additions and 8 deletions
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22
ircd/fs_aio.cc
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@ -704,6 +704,10 @@ try
sizeof(*head),
};
// If this is not set to true, boost might poll() exclusively on the
// eventfd fd and starve the main epoll().
resfd.non_blocking(true);
log::info
{
log, "AIO id:%u fd:%d max_events:%zu max_submit:%zu compat:%x incompat:%x len:%u nr:%u",
@ -910,7 +914,11 @@ ircd::fs::aio::system::submit(request &request)
"ircd::fs::aio chase"
};
auto handler(std::bind(&system::chase, this));
auto handler
{
std::bind(&system::chase, this)
};
ircd::post(descriptor, std::move(handler));
}
@ -1091,16 +1099,16 @@ try
handle_set = true;
ecount = 0;
const asio::mutable_buffers_1 bufs
{
&ecount, sizeof(ecount)
};
auto handler
{
std::bind(&system::handle, this, ph::_1, ph::_2)
};
const asio::mutable_buffers_1 bufs
{
&ecount, sizeof(ecount)
};
resfd.async_read_some(bufs, ios::handle(handle_descriptor, std::move(handler)));
}
catch(...)
@ -1187,8 +1195,6 @@ void
ircd::fs::aio::system::handle_events()
noexcept try
{
assert(!ctx::current);
// The number of completed requests available in events[]. This syscall
// is restarted by us on EINTR. After restart, it may or may not find any ready
// events but it never blocks to do so.