linux-kernel - Re: [patch 1/2] fix epoll single pass code and add wait-exclusive flag ...

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Message-ID: <Pine.LNX.4.64.0705131235490.3212@alien.or.mcafeemobile.com>
Date:	Sun, 13 May 2007 12:37:26 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/2] fix epoll single pass code and add wait-exclusive
 flag ...

On Sun, 13 May 2007, Andrew Morton wrote:

> On Fri, 11 May 2007 19:30:31 -0700 Davide Libenzi <davidel@...ilserver.org> wrote:
> 
> > Fixes the epoll single pass code. During the unlocked event delivery
> > (to userspace) code, the poll callback can re-issue new events, and
> > we must receive them correctly. Since we loop in a lockless fashion,
> > we want to be O(nready), and we don't want to flash on/off the spinlock
> > for every event, we have the poll callback to use a secondary list to
> > queue events while we're inside the event delivery loop.
> > The rw_semaphore has been turned into a mutex.
> > This patch also adds the wait-exclusive flag, as suggested by Davi Arnaut.
> > 
> > ...
> > @@ -534,6 +547,8 @@
> >  	}
> >  
> >  	mutex_unlock(&epmutex);
> > +
> > +	mutex_destroy(&ep->mtx);
> >  }
> 
> It's a little alarming to see a dereference of `ep' right at the end of a
> function called ep_free(ep).
> 
> Code is OK, but perhaps the kfree(ep) should be moved into ep_free()?

Ok, will do.



- Davide


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