* Thomas Graf <[email protected]> 2007-06-18 12:32
> * Miklos Szeredi <[email protected]> 2007-06-18 11:44
> > Garbage collection only ever happens, if the app is sending AF_UNIX
> > sockets over AF_UNIX sockets. Which is a rather rare case. And which
> > is basically why this bug went unnoticed for so long.
> >
> > So my second patch only affects the performance of _exactly_ those
> > apps which might well be bitten by the bug itself.
>
> That's not entirely the truth. It affects all applications using
> AF_UNIX sockets while file descriptors are being transfered. I
> agree that the performance impact is not severe on most systems
> but if file descriptors are being transfered continously by just
> a single application it can become rather severe.
Also think of the scenario where an application, deliberately or not,
begins a file descriptor tranfser using sendmsg() and the receiving
part never invokes recvmsg() to decrement the inflight counters
again. Every unix socket that gets closed would result in a gc call
locking all sockets.
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