From: Roman Zippel <zippel@linux-m68k.org>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] In-kernel module loader 3/7
Date: Thu, 19 Sep 2002 01:07:16 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0209190042370.8911-100000@serv> (raw)
In-Reply-To: <20020918021714.E9A292C13A@lists.samba.org>
Hi,
On Wed, 18 Sep 2002, Rusty Russell wrote:
> +/* Stopping interrupts faster than atomics on many archs (and more
> + easily optimized if they're not) */
> +static inline void bigref_inc(struct bigref *ref)
> +{
> + unsigned long flags;
> + struct bigref_percpu *cpu;
> +
> + local_irq_save(flags);
> + cpu = &ref->ref[smp_processor_id()];
> + if (likely(!cpu->slow_mode))
> + cpu->counter++;
Did you benchmark this? On most UP machines an inc/dec should be cheaper
than irq enable/disable.
bye, Roman
next prev parent reply other threads:[~2002-09-18 23:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 2:07 [PATCH] In-kernel module loader 3/7 Rusty Russell
2002-09-18 23:07 ` Roman Zippel [this message]
2002-09-18 23:11 ` Robert Love
2002-09-19 2:05 ` Rusty Russell
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