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| author | Andy Pan <i@andypan.me> | 2024-07-30 07:59:41 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-07-29 19:59:41 -0400 |
| commit | e5cb1d3d3d4ab3178ac567fb6a7f0f4b5eef3083 (patch) | |
| tree | 912dc7aa7a8067ccd27a2eba91b98dfa68ffe962 /src/unix/loop.c | |
| parent | 63b22be08375372c429ec83e7a933a643adfd73c (diff) | |
| download | libuv-e5cb1d3d3d4ab3178ac567fb6a7f0f4b5eef3083.tar.gz libuv-e5cb1d3d3d4ab3178ac567fb6a7f0f4b5eef3083.zip | |
linux: eliminate a read on eventfd per wakeup (#4400)
Register the eventfd with EPOLLET to enable edge-triggered notification
where we're able to eliminate the overhead of reading the eventfd via
system call on each wakeup event.
When the eventfd counter reaches the maximum value of the unsigned 64-bit,
which may not happen for the entire lifetime of the process, we rewind the
counter and retry.
This optimization saves one system call on each event-loop wakeup,
eliminating the overhead of read(2) as well as the extra latency
for each epoll wakeup.
Diffstat (limited to 'src/unix/loop.c')
0 files changed, 0 insertions, 0 deletions