Re: [PATCH] fs/proc: Move kfree outside pde_unload_lock
From: Nathan Zimmer <hidden>
Date: 2012-08-24 14:48:52
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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:quoted
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