linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Date:	Wed, 17 Sep 2008 16:50:53 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-testers@...r.kernel.org
Subject: Re: [Bug #11308] tbench regression on each kernel release from	2.6.22
 -&gt; 2.6.28

Eric Dumazet a écrit :
> Mike Galbraith a écrit :

>> I sure hope it's something like ping-pong, it's driving me NUTS.
> 
> Could you please try following patch ?
> 
> [PATCH] security_ops moved to read_mostly section
> 
> "struct security_operations *security_ops" should be moved to 
> read_mostly section in order to NOT let it share a cache line with higly 
> modified variables.
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
> 
> diff --git a/security/security.c b/security/security.c
> index 3a4b4f5..0b13d65 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -24,7 +24,7 @@ static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1];
> extern struct security_operations default_security_ops;
> extern void security_fixup_ops(struct security_operations *ops);
> 
> -struct security_operations *security_ops;    /* Initialized to NULL */
> +struct security_operations *security_ops __read_mostly;e

Sorry for the extra 'e' at the end of this line, please remove it :)

> 
> /* amount of vm to protect from userspace access */
> unsigned long mmap_min_addr = CONFIG_SECURITY_DEFAULT_MMAP_MIN_ADDR;
> 



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