Re: [PATCH 0/2] ipc/sem.c: Race in sem_lock()

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On Tue, 2013-09-24 at 09:09 +0200, Mike Galbraith wrote: 
> On Tue, 2013-09-24 at 08:20 +0200, Manfred Spraul wrote: 
> > Hi Greg,
> > 
> > On 09/23/2013 11:28 PM, Greg KH wrote:
> > > <formletter>
> > >
> > > This is not the correct way to submit patches for inclusion in the
> > > stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
> > > for how to do this properly.
> > >
> > > </formletter>
> > Fixing stable will be interesting:
> > Starting with 3.10, changes were introduced that have improved the 
> > scalability by something like factor 100.
> > (factor 100 for sysv sem for calls that do not sleep on a 8 socket, 
> > 64-way Intel system)
> > 
> > Unfortunately, we are still fixing bugs - and the changes are 
> > definitively not trivial.
> > 
> > Thus the next long-term kernel must either go backward to the 3.9 code 
> > or forward - hopefully all bugs will be fixed until the release of 3.12.
> 
> As soon as I finish some maintenance, I'll wedge the "or forward" pile
> into 3.10-rt and beat it up on 8 socket box.

Applied ipc v3.10... plus pending fixes (minus sem_otime/proc), and beat
is up with ltp, rt-tests/foo and benchmark mixes.  No hiccups.

-Mike

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