From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Richard Henderson" <rth@twiddle.net>
Cc: <linux-kernel@vger.kernel.org>,
"\"Paul E. McKenney\"" <pmckenne@us.ibm.com>
Subject: Re: RFC: patch to allow lock-free traversal of lists with insertion
Date: Tue, 9 Oct 2001 18:51:00 +0200 [thread overview]
Message-ID: <000901c150e2$97765470$010411ac@local> (raw)
>
> On Tue, Oct 09, 2001 at 07:03:37PM +1000, Rusty Russell wrote:
> > I don't *like* making Alpha's wmb() stronger, but it is the
> > only solution which doesn't touch common code.
>
> It's not a "solution" at all. It's so heavy weight you'd be
> much better off with locks. Just use the damned rmb_me_harder.
rmb_me_harder? smp_mb__{before,after}_{atomic_dec,clear_bit} are already ugly enough.
What about hiding all these details in the list access macros? list_insert, list_get_next, etc. With a default implementation based
on a spinlock, and the capable SMP architectures could define an optimized version.
Then Alpha could do whatever flushing is required. But please do not scatter memory barrier instructions all around the kernel.
--
Manfred
next reply other threads:[~2001-10-09 16:50 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-09 16:51 Manfred Spraul [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-10-11 1:56 RFC: patch to allow lock-free traversal of lists with insertion Paul E. McKenney
2001-10-12 4:14 ` Rusty Russell
2001-10-13 14:48 ` Paul E. McKenney
2001-10-10 21:47 Paul McKenney
2001-10-10 22:22 ` Richard Henderson
2001-10-10 22:27 ` Richard Henderson
2001-10-10 1:19 Paul McKenney
2001-10-10 1:43 ` Andrea Arcangeli
2001-10-09 18:01 Paul McKenney
2001-10-09 17:46 Paul McKenney
2001-10-09 15:45 Paul McKenney
2001-10-09 17:00 ` Richard Henderson
2001-10-10 3:33 ` Paul Mackerras
2001-10-10 17:02 ` Richard Henderson
2001-10-09 15:28 Paul McKenney
2001-10-09 15:24 Paul McKenney
2001-10-09 5:27 Paul McKenney
2001-10-09 5:56 ` David S. Miller
2001-10-09 6:43 ` Richard Henderson
2001-10-09 1:55 Paul E. McKenney
2001-10-09 2:18 ` David S. Miller
2001-10-09 6:52 ` Richard Henderson
2001-10-09 9:03 ` Rusty Russell
2001-10-09 16:11 ` Richard Henderson
2001-10-10 1:39 ` Rusty Russell
2001-10-09 7:13 ` BALBIR SINGH
2001-10-09 7:46 ` Dipankar Sarma
2001-10-09 8:21 ` BALBIR SINGH
2001-10-09 8:48 ` Dipankar Sarma
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