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SubjectRe: [PATCH] fs/proc: Move kfree outside pde_unload_lock
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Le vendredi 24 août 2012 à 09:48 -0500, Nathan Zimmer a écrit :
> On Wed, Aug 22, 2012 at 11:42:58PM +0200, Eric Dumazet wrote:
> > On Wed, 2012-08-22 at 20:28 +0200, Eric Dumazet wrote:
> >
> > >
> > > Thats interesting, but if you really want this to fly, one RCU
> > > conversion would be much better ;)
> > >
> > > pde_users would be an atomic_t and you would avoid the spinlock
> > > contention.
> >
> > Here is what I had in mind, I would be interested to know how it helps a 512 core machine ;)
> >
>
> Here are the results and they look great.
>
> cpuinfo baseline moved kfree Rcu
> tasks read-sec read-sec read-sec
> 1 0.0141 0.0141 0.0141
> 2 0.0140 0.0140 0.0142
> 4 0.0140 0.0141 0.0141
> 8 0.0145 0.0145 0.0140
> 16 0.0553 0.0548 0.0168
> 32 0.1688 0.1622 0.0549
> 64 0.5017 0.3856 0.1690
> 128 1.7005 0.9710 0.5038
> 256 5.2513 2.6519 2.0804
> 512 8.0529 6.2976 3.0162
>
>
>

Indeed...

Could you explicit the test you are actually doing ?

Thanks


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