From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@elte.hu>,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@polymtl.ca>,
josh@joshtriplett.org, niv@us.ibm.com,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"David Howells" <dhowells@redhat.com>,
edumazet@google.com, darren@dvhart.com,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Silas Boyd-Wickizer" <sbw@mit.edu>,
Linux-Arch <linux-arch@vger.kernel.org>,
linux-kbuild <linux-kbuild@vger.kernel.org>
Subject: Re: [PATCH tip/core/rcu 8/9] nohz_full: Add full-system-idle state machine
Date: Sat, 7 Sep 2013 11:59:42 -0700 [thread overview]
Message-ID: <20130907185942.GG3966@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAMuHMdXsAfo=LMF8E84_Lyhs+w5c3VKCEe7ZW5Bs7fwFV+J==w@mail.gmail.com>
On Sat, Sep 07, 2013 at 01:22:57PM +0200, Geert Uytterhoeven wrote:
> On Fri, Sep 6, 2013 at 8:50 PM, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > On Fri, Sep 6, 2013 at 7:30 PM, Paul E. McKenney
> > <paulmck@linux.vnet.ibm.com> wrote:
> >>> Furthermore, it seems only hexagon, metag, mips, and x86 set NR_CPUS to 1
> >>> if !SMP. On other architectures, NR_CPUS is not defined and presumed to be 0.
> >>
> >> Would it make sense to require that NR_CPUS=1 for !SMP?
> >
> > Yes, this looks reasonable to me.
>
> Perhaps we can invert the logic and define only NR_CPUS in arch-specific
> code, and derive SMP from NR_CPUS != 1 in generic code?
If we always had NR_CPUS defined, that might be a good way to go.
We would of course need acks from the various arch maintainers. I am
guessing that we are OK for m68k. ;-)
Thanx, Paul
next prev parent reply other threads:[~2013-09-07 18:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 2:47 [PATCH tip/core/rcu 0/9] v2 sysidle changes for 3.12 Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 1/9] rcu: Eliminate unused APIs intended for adaptive ticks Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 2/9] nohz_full: Add testing information to documentation Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 3/9] nohz_full: Add Kconfig parameter for scalable detection of all-idle state Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 4/9] nohz_full: Add rcu_dyntick data " Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 5/9] nohz_full: Add per-CPU idle-state tracking Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 6/9] nohz_full: Add full-system idle states and variables Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 7/9] nohz_full: Add full-system-idle arguments to API Paul E. McKenney
2013-08-20 2:47 ` [PATCH tip/core/rcu 8/9] nohz_full: Add full-system-idle state machine Paul E. McKenney
2013-08-26 5:45 ` Lai Jiangshan
2013-08-26 16:24 ` Paul E. McKenney
2013-08-27 3:41 ` Lai Jiangshan
2013-08-31 21:20 ` Paul E. McKenney
2013-09-06 8:08 ` Geert Uytterhoeven
2013-09-06 17:30 ` Paul E. McKenney
2013-09-06 18:50 ` Geert Uytterhoeven
2013-09-06 19:32 ` Paul E. McKenney
2013-09-07 11:22 ` Geert Uytterhoeven
2013-09-07 18:59 ` Paul E. McKenney [this message]
2013-09-07 9:13 ` Yann E. MORIN
2013-09-07 18:57 ` Paul E. McKenney
2013-09-08 10:32 ` Yann E. MORIN
2013-09-08 10:46 ` Frederic Weisbecker
2013-08-20 2:47 ` [PATCH tip/core/rcu 9/9] nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU Paul E. McKenney
-- strict thread matches above, loose matches on Subject: below --
2013-08-18 1:49 [PATCH tip/core/rcu 0/9] sysidle changes for v3.12 Paul E. McKenney
2013-08-18 1:49 ` [PATCH tip/core/rcu 1/9] rcu: Eliminate unused APIs intended for adaptive ticks Paul E. McKenney
2013-08-18 1:49 ` [PATCH tip/core/rcu 8/9] nohz_full: Add full-system-idle state machine Paul E. McKenney
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