From: Corey Minyard <minyard@acm.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Greg KH <greg@kroah.com>, Sergey Vlasov <vsu@altlinux.ru>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] New operation for kref to help avoid locks
Date: Tue, 01 Mar 2005 17:35:15 -0600 [thread overview]
Message-ID: <4224FC33.6040405@acm.org> (raw)
In-Reply-To: <1109715256.6293.180.camel@laptopd505.fenrus.org>
Arjan van de Ven wrote:
>>Just doing an atomic operation is not faster than doing a lock, an
>>atomic operation, then an unlock? Am I missing something?
>>
>>
>
>if the lock and the atomic are on the same cacheline they're the same
>cost on most modern cpus...
>
>
Ah, I see. Not likely to ever be the case with this. The lock will
likely be with the main data structure (the list, or whatever) and the
refcount will be in the individual item in the main data structure (list
entry).
-Corey
next prev parent reply other threads:[~2005-03-01 23:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-26 15:55 [PATCH] New operation for kref to help avoid locks Corey Minyard
2005-02-26 20:20 ` Sergey Vlasov
2005-02-26 22:23 ` Corey Minyard
2005-03-01 20:15 ` Greg KH
2005-03-01 21:02 ` Arjan van de Ven
2005-03-01 21:24 ` Greg KH
2005-03-01 21:54 ` Corey Minyard
2005-03-01 22:14 ` Arjan van de Ven
2005-03-01 23:35 ` Corey Minyard [this message]
2005-03-02 0:02 ` Nick Piggin
2005-03-02 0:28 ` Corey Minyard
2005-03-02 0:34 ` Nick Piggin
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