linux-kernel - Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay factor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1356550039.20133.20884.camel@edumazet-glaptop>
Date:	Wed, 26 Dec 2012 11:27:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	aquini@...hat.com, walken@...gle.com, lwoodman@...hat.com,
	jeremy@...p.org, Jan Beulich <JBeulich@...ell.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay
 factor

On Wed, 2012-12-26 at 11:10 -0800, Eric Dumazet wrote:

> +#define DELAY_HASH_SHIFT 4
> +DEFINE_PER_CPU(int [1 << DELAY_HASH_SHIFT], spinlock_delay) = { 
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +};

This can use the following initialize by the way :

DEFINE_PER_CPU(int [1 << DELAY_HASH_SHIFT], spinlock_delay) = {
        [0 ... (1 << DELAY_HASH_SHIFT) - 1] = MIN_SPINLOCK_DELAY,
};



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/