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SubjectRe: [PATCH] fs/proc: Move kfree outside pde_unload_lock
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





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