From: Luiz Fernando Capitulino <lcapitulino@mandriva.com.br>
To: Arjan van de Ven <arjan@infradead.org>
Cc: oliver@neukum.org, linux-usb-devel@lists.sourceforge.net,
ehabkost@mandriva.com, gregkh@suse.de,
linux-kernel@vger.kernel.org
Subject: Re: [linux-usb-devel] Re: [PATCH 00/10] usb-serial: Switches from spin lock to atomic_t.
Date: Wed, 7 Dec 2005 10:41:24 -0200 [thread overview]
Message-ID: <20051207104124.652237fb.lcapitulino@mandriva.com.br> (raw)
In-Reply-To: <1133958878.2869.21.camel@laptopd505.fenrus.org>
On Wed, 07 Dec 2005 13:34:38 +0100
Arjan van de Ven <arjan@infradead.org> wrote:
| On Wed, 2005-12-07 at 10:30 -0200, Luiz Fernando Capitulino wrote:
| > On Wed, 07 Dec 2005 13:27:13 +0100
| > Arjan van de Ven <arjan@infradead.org> wrote:
| >
| > |
| > | > Isn't it right? Is the URB write so fast that switching to atomic_t
| > | > doesn't pay-off?
| > |
| > | an atomic_t access and a spinlock are basically the same price... so
| > | what's the payoff ?
| >
| > One lock less,
|
| where?
In the 'usb_serial_port', my patch number nine removes the spin lock.
| spin_unlock in principle runs unlocked on x86 at least
| (except for ppro workarounds but those are/should be optional)
|
|
--
Luiz Fernando N. Capitulino
next prev parent reply other threads:[~2005-12-07 12:41 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-06 11:56 Luiz Fernando Capitulino
2005-12-06 19:40 ` Greg KH
2005-12-06 20:13 ` Eduardo Pereira Habkost
2005-12-06 22:48 ` [linux-usb-devel] " Oliver Neukum
2005-12-07 12:24 ` Luiz Fernando Capitulino
2005-12-07 12:27 ` Arjan van de Ven
2005-12-07 12:30 ` Luiz Fernando Capitulino
2005-12-07 12:34 ` Arjan van de Ven
2005-12-07 12:41 ` Luiz Fernando Capitulino [this message]
2005-12-07 12:54 ` Luiz Fernando Capitulino
2005-12-07 15:07 ` Alan Stern
2005-12-07 15:22 ` Arjan van de Ven
2005-12-07 15:37 ` Oliver Neukum
2005-12-07 15:40 ` Arjan van de Ven
2005-12-07 15:50 ` Oliver Neukum
2005-12-07 16:02 ` Alan Cox
2005-12-07 16:00 ` Eduardo Pereira Habkost
2005-12-07 16:02 ` Arjan van de Ven
2005-12-07 16:23 ` Eduardo Pereira Habkost
2005-12-07 16:01 ` Alan Stern
2005-12-07 16:04 ` Arjan van de Ven
2005-12-07 15:32 ` linux-os (Dick Johnson)
2005-12-07 16:08 ` Alan Stern
2005-12-06 20:14 ` Luiz Fernando Capitulino
2005-12-06 21:02 ` Pete Zaitcev
2005-12-06 21:18 ` Luiz Fernando Capitulino
2005-12-06 22:36 ` [linux-usb-devel] " Oliver Neukum
2005-12-07 12:25 ` Luiz Fernando Capitulino
2005-12-07 13:01 ` Oliver Neukum
2005-12-07 13:17 ` Luiz Fernando Capitulino
2005-12-07 16:41 ` Greg KH
2005-12-07 16:51 ` Luiz Fernando Capitulino
2005-12-07 17:13 ` Eduardo Pereira Habkost
2005-12-07 17:56 ` Greg KH
2005-12-07 19:10 ` Eduardo Pereira Habkost
2005-12-07 16:55 ` Otavio Salvador
2005-12-07 16:59 ` Greg KH
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