linux-kernel - Re: [PATCH] fs/proc: Move kfree outside pde_unload

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Date:	Thu, 23 Aug 2012 12:54:56 -0500
From:	Nathan Zimmer <nzimmer@....com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<adobriyan@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] fs/proc: Move kfree outside pde_unload_lock

On 08/22/2012 04:42 PM, 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 ;)
>
Thanks, I knew if I just took my time and read the rcu documentation
thoroughly that the answer would be forthcoming. ;)

Unfortunately I have to wait till tomorrow to get big box and test it.


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