From: Greg KH <greg@kroah.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, vserver@list.linux-vserver.org,
Herbert Poetzl <herbert@13thfloor.at>,
"Serge E. Hallyn" <serue@us.ibm.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Dave Hansen <haveblue@us.ibm.com>,
Arjan van de Ven <arjan@infradead.org>,
Suleiman Souhlal <ssouhlal@FreeBSD.org>,
Hubertus Franke <frankeh@watson.ibm.com>,
Cedric Le Goater <clg@fr.ibm.com>,
Kyle Moffett <mrmacman_g4@mac.com>
Subject: Re: [PATCH 1/5] pid: Implement task references.
Date: Mon, 30 Jan 2006 10:43:02 -0800 [thread overview]
Message-ID: <20060130184302.GA17457@kroah.com> (raw)
In-Reply-To: <43DDA1E7.5010109@cosmosbay.com>
On Mon, Jan 30, 2006 at 06:19:35AM +0100, Eric Dumazet wrote:
> Example of improvement in kref_put() :
>
> [PATCH] kref : Avoid an atomic operation in kref_put() when the last
> reference is dropped. On most platforms, atomic_read() is a plan read of
> the counter and involves no atomic at all.
No, we wat to decrement and test at the same time, to protect against
any race where someone is incrementing right when we are dropping the
last reference.
So, thanks, but I'm not going to apply this.
greg k-h
next prev parent reply other threads:[~2006-01-30 18:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-29 7:19 [RFC][PATCH 0/5] Task references Eric W. Biederman
2006-01-29 7:22 ` [PATCH 1/5] pid: Implement task references Eric W. Biederman
2006-01-29 7:24 ` [PATCH 2/5] pid: Add macros for interating through tasks by type Eric W. Biederman
2006-01-29 7:28 ` [PATCH 3/5] pid: Implement kill_tref Eric W. Biederman
2006-01-29 7:33 ` [PATCH 4/5] vt: Update spawnpid to use a task_ref Eric W. Biederman
2006-01-29 7:35 ` [PATCH 5/5] file: Modify struct fown_struct to contain a tref Eric W. Biederman
2006-01-29 8:43 ` Suleiman Souhlal
2006-01-29 9:18 ` Eric W. Biederman
2006-01-30 10:51 ` [PATCH 4/5] vt: Update spawnpid to use a task_ref Pavel Machek
2006-01-30 20:39 ` Eric W. Biederman
2006-01-30 21:05 ` Pavel Machek
2006-01-30 21:15 ` Eric W. Biederman
2006-01-29 8:46 ` [PATCH 1/5] pid: Implement task references Suleiman Souhlal
2006-01-29 19:05 ` Greg KH
2006-01-29 21:58 ` Eric W. Biederman
2006-01-30 4:51 ` Greg KH
2006-01-30 5:19 ` Eric Dumazet
2006-01-30 5:35 ` Kyle Moffett
2006-01-30 5:46 ` Eric Dumazet
2006-01-30 6:46 ` Kyle Moffett
2006-01-30 18:43 ` Greg KH [this message]
2006-01-30 19:58 ` Eric Dumazet
2006-01-30 20:45 ` Eric W. Biederman
2006-01-30 21:32 ` Eric Dumazet
2006-01-30 21:51 ` Eric W. Biederman
2006-01-30 20:13 ` Eric W. Biederman
2006-01-31 6:58 ` Greg KH
2006-01-31 16:04 ` Eric W. Biederman
2006-01-29 8:05 ` [RFC][PATCH 0/5] Task references Kyle Moffett
2006-02-06 8:09 ` Eric W. Biederman
2006-02-06 14:36 ` Serge E. Hallyn
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