netdev - Re: [PATCH net-next-2.6 v2] pkt_sched: gen_estimator: kill est

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Message-ID: <20100608202405.GA3496@del.dom.local>
Date:	Tue, 8 Jun 2010 22:24:05 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next-2.6 v2] pkt_sched: gen_estimator: kill
 est_lock rwlock

On Tue, Jun 08, 2010 at 09:45:29PM +0200, Eric Dumazet wrote:
> Le mardi 08 juin 2010 ?? 21:29 +0200, Jarek Poplawski a écrit :
> > Jarek Poplawski wrote, On 06/08/2010 02:40 PM:
> > 
> > > On Tue, Jun 08, 2010 at 02:27:32PM +0200, Eric Dumazet wrote:
> > >> Le mardi 08 juin 2010 ?? 12:15 +0000, Jarek Poplawski a écrit :
> > >>
> > >>> Actually, I guess, Changli meant the bug introduced by your previous
> > >>> patch by removing the est_lock. With this lock (and your commit 5d944)
> > >>> bstats (and API) seem "fundamentaly" safe.
> > >>>
> > >> Sorry, I have no idea of what you want to say, I cant find commit 5d944.
> > >>
> > > 
> > > Sorry, I meant the commit mentioned in your changelog which was quoted.
> > > 
> > >> This was partially addressed in commit 5d944c640b4 (gen_estimator:
> > >> deadlock fix), but same problem exist for all gen_kill_estimator()
> > >> users.
> > 
> > In case it's still unclear, I wanted to say that IMHO this patch's
> > title and changelog are misleading because most of its content are
> > est_lock to RCU changes - not fixes.
> > 
> 
> ...
> 
> > >> [PATCH net-next-2.6] pkt_sched: gen_kill_estimator() rcu fixes
> > >> 
> > >> gen_kill_estimator() API is fundamentaly wrong, since caller should make
> > >> sure an RCU grace period is respected before freeing bstats or lock.
> > 
> > Freeing bstats doesn't currently require RCU protection.
> > 
> > Jarek P.
> 
> So what ? No changes needed ?

Such a changelog is a documentation for future, just like this one,
crucial for this suject:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0929c2dd83317813425b937fbc0041013b8685ff

There is no reason to make people (our?) life harder with describing
unexistent bugs.

> 
> I am really lost by your comments Jarek.
> 
> Maybe you could provide an alternative patch, so that we can make some
> progress ?
> 

No, I only meant fixing the title and changelog if you have any problem
with separating it for two parts.

Jarek P.
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