From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
Yinghai Lu <yinghai@kernel.org>, Nick Piggin <npiggin@suse.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jens Axboe <jens.axboe@oracle.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Steven Rostedt <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: Re: Q: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many())
Date: Wed, 18 Feb 2009 18:10:48 +0100 [thread overview]
Message-ID: <20090218171048.GA12299@elte.hu> (raw)
In-Reply-To: <20090218170517.GA9769@elte.hu>
ok, it's documented:
Intel® 64 and IA-32 Architectures
Software Developer’s Manual
Volume 3A:
System Programming Guide, Part 1
9.5.3 MSR Access in x2APIC Mode
To allow for efficient access to the APIC registers in x2APIC
mode, the serializing semantics of WRMSR are relaxed when
writing to the APIC registers. Thus, system software should not
use “WRMSR to APIC registers in x2APIC mode” as a serializing
instruction. Read and write accesses to the APIC registers will
occur in program order. A WRMSR to an APIC register may
complete before all preceding stores are globally visible;
software can prevent this by inserting a serializing
instruction or MFENCE before the WRMSR.
Ingo
next prev parent reply other threads:[~2009-02-18 17:11 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-16 16:38 [PATCH 0/4] generic smp helpers vs kmalloc Peter Zijlstra
2009-02-16 16:38 ` [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many() Peter Zijlstra
2009-02-16 19:10 ` Oleg Nesterov
2009-02-16 19:41 ` Peter Zijlstra
2009-02-16 20:30 ` Oleg Nesterov
2009-02-16 20:55 ` Peter Zijlstra
2009-02-16 21:22 ` Oleg Nesterov
2009-02-17 12:25 ` Oleg Nesterov
2009-02-16 20:49 ` Q: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many()) Oleg Nesterov
2009-02-16 21:03 ` Peter Zijlstra
2009-02-16 21:32 ` Oleg Nesterov
2009-02-16 21:45 ` Peter Zijlstra
2009-02-16 22:02 ` Oleg Nesterov
2009-02-16 22:24 ` Peter Zijlstra
2009-02-16 23:19 ` Oleg Nesterov
2009-02-17 9:29 ` Peter Zijlstra
2009-02-17 10:11 ` Nick Piggin
2009-02-17 10:27 ` Peter Zijlstra
2009-02-17 10:39 ` Nick Piggin
2009-02-17 11:26 ` Nick Piggin
2009-02-17 11:48 ` Peter Zijlstra
2009-02-17 15:51 ` Paul E. McKenney
2009-02-18 2:15 ` Suresh Siddha
2009-02-18 2:40 ` Paul E. McKenney
2009-02-17 19:28 ` Q: " Oleg Nesterov
2009-02-17 21:32 ` Paul E. McKenney
2009-02-17 21:45 ` Oleg Nesterov
2009-02-17 22:39 ` Paul E. McKenney
2009-02-18 13:52 ` Nick Piggin
2009-02-18 16:09 ` Linus Torvalds
2009-02-18 16:21 ` Ingo Molnar
2009-02-18 16:33 ` Linus Torvalds
2009-02-18 16:58 ` Ingo Molnar
2009-02-18 17:05 ` Ingo Molnar
2009-02-18 17:10 ` Ingo Molnar [this message]
2009-02-18 17:17 ` Linus Torvalds
2009-02-18 17:23 ` Ingo Molnar
2009-02-18 17:14 ` Linus Torvalds
2009-02-18 17:47 ` Ingo Molnar
2009-02-18 18:33 ` Suresh Siddha
2009-02-18 16:37 ` Gleb Natapov
2009-02-19 0:12 ` Nick Piggin
2009-02-19 6:47 ` Benjamin Herrenschmidt
2009-02-19 13:11 ` Nick Piggin
2009-02-19 15:06 ` Ingo Molnar
2009-02-19 21:49 ` Benjamin Herrenschmidt
2009-02-18 2:21 ` Suresh Siddha
2009-02-18 13:59 ` Nick Piggin
2009-02-18 16:19 ` Linus Torvalds
2009-02-18 16:23 ` Ingo Molnar
2009-02-18 18:43 ` Suresh Siddha
2009-02-18 19:17 ` Ingo Molnar
2009-02-18 23:55 ` Suresh Siddha
2009-02-19 12:20 ` Ingo Molnar
2009-02-19 12:29 ` Nick Piggin
2009-02-19 12:45 ` Ingo Molnar
2009-02-19 22:00 ` Suresh Siddha
2009-02-20 10:56 ` Ingo Molnar
2009-02-20 18:56 ` Suresh Siddha
2009-02-20 19:40 ` Ingo Molnar
2009-02-20 23:28 ` Jack Steiner
2009-02-25 3:32 ` Nick Piggin
2009-02-25 12:47 ` Ingo Molnar
2009-02-25 18:25 ` Luck, Tony
2009-03-17 18:16 ` Suresh Siddha
2009-03-18 8:51 ` [tip:x86/x2apic] x86: add x2apic_wrmsr_fence() to x2apic flush tlb paths Suresh Siddha
2009-02-17 12:40 ` Q: smp.c && barriers (Was: [PATCH 1/4] generic-smp: remove single ipi fallback for smp_call_function_many()) Peter Zijlstra
2009-02-17 15:43 ` Paul E. McKenney
2009-02-17 15:40 ` [PATCH] generic-smp: remove kmalloc() Peter Zijlstra
2009-02-17 17:21 ` Oleg Nesterov
2009-02-17 17:40 ` Peter Zijlstra
2009-02-17 17:46 ` Peter Zijlstra
2009-02-17 18:30 ` Oleg Nesterov
2009-02-17 19:29 ` [PATCH -v4] generic-ipi: " Peter Zijlstra
2009-02-17 20:02 ` Oleg Nesterov
2009-02-17 20:11 ` Peter Zijlstra
2009-02-17 20:16 ` Peter Zijlstra
2009-02-17 20:44 ` Oleg Nesterov
2009-02-17 20:49 ` Peter Zijlstra
2009-02-17 22:09 ` Oleg Nesterov
2009-02-17 22:15 ` Peter Zijlstra
2009-02-17 21:30 ` Paul E. McKenney
2009-02-17 21:38 ` Peter Zijlstra
2009-02-16 16:38 ` [PATCH 2/4] generic-smp: remove kmalloc usage Peter Zijlstra
2009-02-17 0:40 ` Linus Torvalds
2009-02-17 8:24 ` Peter Zijlstra
2009-02-17 9:43 ` Ingo Molnar
2009-02-17 9:49 ` Peter Zijlstra
2009-02-17 10:56 ` Ingo Molnar
2009-02-18 4:50 ` Rusty Russell
2009-02-18 16:05 ` Ingo Molnar
2009-02-19 0:00 ` Jeremy Fitzhardinge
2009-02-19 12:21 ` Ingo Molnar
2009-02-19 4:31 ` Rusty Russell
2009-02-19 9:10 ` Peter Zijlstra
2009-02-19 11:04 ` Jens Axboe
2009-02-19 16:52 ` Linus Torvalds
2009-02-17 15:44 ` Linus Torvalds
2009-02-16 16:38 ` [PATCH 3/4] generic-smp: properly allocate the cpumasks Peter Zijlstra
2009-02-16 23:17 ` Rusty Russell
2009-02-16 16:38 ` [PATCH 4/4] generic-smp: clean up some of the csd->flags fiddling Peter Zijlstra
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