From: Miklos Szeredi <[email protected]>
Date: Wed, 06 Jun 2007 10:08:29 +0200
> > > > Holding a global mutex over recvmsg() calls under AF_UNIX is pretty
> > > > much a non-starter, this will kill performance for multi-threaded
> > > > apps.
> > >
> > > That's an rwsem held for read. It's held for write in unix_gc() only
> > > for a short duration, and unix_gc() should only rarely be called. So
> > > I don't think there's any performance problem here.
> >
> > It pulls a non-local cacheline into the local thread, that's extremely
> > expensive on SMP.
>
> OK, here's an updated patch, that uses ->readlock, and passes my
> testing.
Thanks a lot, I'll review this as soon as possible unless
someone else beats me to it :)
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