tree b2b8bb6ec26cde5946aca0e366b73422228a6a0d
parent 9504dd64c6a92de1c20f6a53fb25c4e27ba6683d
author Willy Tarreau <w@1wt.eu> 1539589486 +0200
committer Willy Tarreau <w@1wt.eu> 1539602706 +0200
encoding latin1

MEDIUM: fd/threads: only grab the fd's lock if the FD has more than one thread

The vast majority of FDs are only seen by one thread. Currently the lock
on FDs costs a lot because it's touched often, though there should be very
little contention. This patch ensures that the lock is only grabbed if the
FD is shared by more than one thread, since otherwise the situation is safe.
Doing so resulted in a 15% performance boost on a 12-threads test.