From: "H. Peter Anvin" <hpa@zytor.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <bitbucket@online.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>, Andi Kleen <ak@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: [RFC][PATCH 0/5] preempt_count rework
Date: Wed, 14 Aug 2013 09:58:07 -0700 [thread overview]
Message-ID: <520BB71F.6000701@zytor.com> (raw)
In-Reply-To: <20130814165227.GA21191@laptop.programming.kicks-ass.net>
On 08/14/2013 09:52 AM, Peter Zijlstra wrote:
>
> Oh curses, this is because lea can't do segment offsets? So there's no
> sane way to get addresses of per-cpu variables.
>
> Because ideally we'd have something like:
>
> lea %gs:__percpu_runqueues,%rax
>
> So in this case it makes sense to also store the actual pointer; how
> unfortunate.
>
Correct; the segment offset is not part of the effective address, even
in 64-bit mode.
-hpa
next prev parent reply other threads:[~2013-08-14 16:58 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-14 13:15 [RFC][PATCH 0/5] preempt_count rework Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 1/5] sched: Introduce preempt_count accessor functions Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 2/5] sched: Add NEED_RESCHED to the preempt_count Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 3/5] sched, arch: Create asm/preempt.h Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 4/5] sched: Create more preempt_count accessors Peter Zijlstra
2013-08-14 13:15 ` [RFC][PATCH 5/5] sched, x86: Provide a per-cpu preempt_count implementation Peter Zijlstra
2013-08-14 13:47 ` [RFC][PATCH 0/5] preempt_count rework H. Peter Anvin
2013-08-14 15:39 ` Mike Galbraith
2013-08-14 15:43 ` H. Peter Anvin
2013-08-15 9:01 ` Mike Galbraith
2013-08-14 16:06 ` Peter Zijlstra
2013-08-14 16:14 ` H. Peter Anvin
2013-08-14 16:52 ` Peter Zijlstra
2013-08-14 16:58 ` H. Peter Anvin [this message]
2013-08-14 16:04 ` Peter Zijlstra
2013-08-14 17:31 ` Peter Zijlstra
2013-08-14 16:48 ` Andi Kleen
2013-08-14 16:55 ` Peter Zijlstra
2013-08-14 17:12 ` Andi Kleen
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