linux-kernel - Re: [PATCH 0/3] locking/static_key: improve rate limited labels

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Message-ID: <20190416173846.GR4038@hirez.programming.kicks-ass.net>
Date:   Tue, 16 Apr 2019 19:38:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     tglx@...utronix.de, David Miller <davem@...emloft.net>,
        ard.biesheuvel@...aro.org, yamada.masahiro@...ionext.com,
        mingo@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, oss-drivers@...ronome.com,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH 0/3] locking/static_key: improve rate limited labels

On Tue, Apr 16, 2019 at 09:33:15AM -0700, Jakub Kicinski wrote:
> On Thu, 4 Apr 2019 12:29:02 +0200, Peter Zijlstra wrote:
> > On Mon, Apr 01, 2019 at 11:21:53AM -0700, Jakub Kicinski wrote:
> > > On Fri, 29 Mar 2019 17:08:51 -0700, Jakub Kicinski wrote:  
> > > > Hi!
> > > > 
> > > > This will be used to fix the static branch disabling in the TLS
> > > > code.  The net/tls/ code should be using the deferred static
> > > > branch type, because unprivileged users can flip the branch
> > > > on and off quite easily with CONFIG_TLS_DEVICE=y.
> > > > 
> > > > Second of all we shouldn't take the jump label locks from
> > > > the RX path, when the socket is destroyed.  This can be avoided
> > > > with some slight code refactoring in deferred static_key as
> > > > it already runs from a workqueue.
> > > > 
> > > > This the series (and a simple tls patch which makes use of it)
> > > > applied opening 0.5M TLS connections to localhost (just calling
> > > > setsockopt, no data exchange) goes down from 37.9s to 12.4s.  
> > > 
> > > Once/if we get positive feedback from locking folks, would it be
> > > possible to merge these via net-next tree alongside the patch
> > > converting TLS to rate limited branches?  
> > 
> > Looks good. If routed through the network tree because usage there:
> > 
> > Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > 
> > Otherwise let me know and I'll carry them.
> 
> Hi Peter!  I was initially hoping that a1247d06d010
> ("locking/static_key: Fix false positive warnings on concurrent dec/inc")
> may go into 5.1, but it's not really a regression.  It will conflict, so
> the net-next route won't work.  Would you be able to carry this set
> after all?

n/p, done!