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From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
	LKML <linux-kernel@vger.kernel.org>, gcc <gcc@gcc.gnu.org>,
	Ingo Molnar <mingo@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	David Daney <ddaney.cavm@gmail.com>,
	Behan Webster <behanw@converseincode.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Herbert Xu <herbert@gondor.hengli.com.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections
Date: Mon, 05 Aug 2013 11:33:57 -0700	[thread overview]
Message-ID: <51FFF015.6020803@linux.intel.com> (raw)
In-Reply-To: <CA+55aFwRHpL-3YObZfw6NxxDxMqQbiwp0=NnpotGj2RHDNF3iw@mail.gmail.com>

On 08/05/2013 11:20 AM, Linus Torvalds wrote:
> 
> Of course, it would be good to optimize static_key_false() itself -
> right now those static key jumps are always five bytes, and while they
> get nopped out, it would still be nice if there was some way to have
> just a two-byte nop (turning into a short branch) *if* we can reach
> another jump that way..For small functions that would be lovely. Oh
> well.
> 

That would definitely require gcc support.  It would be useful, but
probably requires a lot of machinery.

	-hpa



  parent reply	other threads:[~2013-08-05 18:34 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-05 16:55 [RFC] gcc feature request: Moving blocks into sections Steven Rostedt
2013-08-05 17:02 ` H. Peter Anvin
2013-08-05 17:24   ` Steven Rostedt
2013-08-05 17:12 ` Linus Torvalds
2013-08-05 17:15   ` Linus Torvalds
2013-08-05 17:55   ` Steven Rostedt
2013-08-05 18:11     ` Steven Rostedt
2013-08-05 18:17     ` H. Peter Anvin
2013-08-05 18:23       ` Steven Rostedt
2013-08-05 18:29         ` H. Peter Anvin
2013-08-05 18:49           ` Steven Rostedt
2013-08-05 18:51             ` H. Peter Anvin
2013-08-05 19:01               ` Linus Torvalds
2013-08-05 19:54                 ` Mathieu Desnoyers
2013-08-05 19:57                   ` Linus Torvalds
2013-08-05 20:02                     ` Steven Rostedt
2013-08-05 21:28                     ` Mathieu Desnoyers
2013-08-05 21:43                       ` H. Peter Anvin
2013-08-06  4:14                         ` Mathieu Desnoyers
2013-08-06  4:28                           ` H. Peter Anvin
2013-08-06 16:15                         ` Steven Rostedt
2013-08-06 16:19                           ` H. Peter Anvin
2013-08-06 16:26                             ` Steven Rostedt
2013-08-06 16:29                               ` H. Peter Anvin
2013-08-05 21:44                       ` Steven Rostedt
2013-08-05 22:08                         ` Mathieu Desnoyers
2013-08-05 19:09               ` Steven Rostedt
2013-08-05 18:20     ` Linus Torvalds
2013-08-05 18:24       ` Linus Torvalds
2013-08-05 18:34         ` Linus Torvalds
2013-08-05 18:38           ` H. Peter Anvin
2013-08-05 19:04           ` Steven Rostedt
2013-08-05 19:40           ` Marek Polacek
2013-08-05 19:56             ` Linus Torvalds
2013-08-05 19:57             ` Jason Baron
2013-08-05 20:35               ` Richard Henderson
2013-08-06  2:26                 ` Jason Baron
2013-08-06  3:03                   ` Steven Rostedt
2013-08-05 18:33       ` H. Peter Anvin [this message]
2013-08-05 18:39       ` Steven Rostedt
2013-08-05 18:49         ` Linus Torvalds
2013-08-05 19:39           ` Steven Rostedt
2013-08-06 14:19           ` Steven Rostedt
2013-08-06 17:48             ` Linus Torvalds
2013-08-06 17:58               ` Steven Rostedt
2013-08-06 20:33                 ` Mathieu Desnoyers
2013-08-06 20:43                   ` Steven Rostedt
2013-08-07  0:45                     ` Steven Rostedt
2013-08-07  0:56                       ` Steven Rostedt
2013-08-07  5:06                         ` Ondřej Bílka
2013-08-07 15:02                           ` Steven Rostedt
2013-08-07 16:03                             ` Mathieu Desnoyers
2013-08-07 16:11                               ` Steven Rostedt
2013-08-07 23:22                                 ` Mathieu Desnoyers
2013-08-05 20:06         ` Jason Baron
2013-08-05 19:04 ` Andi Kleen
2013-08-05 19:16   ` Steven Rostedt
2013-08-05 19:30     ` Xinliang David Li
2013-08-05 19:25   ` Linus Torvalds
2013-08-12  9:17 ` Peter Zijlstra
2013-08-12 14:56   ` H. Peter Anvin
2013-08-12 16:02     ` Andi Kleen
2013-08-12 16:11       ` Peter Zijlstra
2013-08-12 16:09     ` Peter Zijlstra
2013-08-12 17:47       ` H. Peter Anvin
2013-08-13  7:50         ` Peter Zijlstra
2013-08-13 14:46           ` H. Peter Anvin
2013-08-13 14:52             ` Steven Rostedt

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