From: Peter Zijlstra <peterz@infradead.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Johannes Weiner <hannes@cmpxchg.org>, Jan Kara <jack@suse.cz>,
Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
Will Deacon <will.deacon@arm.com>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: page_waitqueue() considered harmful
Date: Thu, 29 Sep 2016 09:43:56 +0200 [thread overview]
Message-ID: <20160929074356.GA2784@worktop> (raw)
In-Reply-To: <20160929071451.GI3318@worktop.controleur.wifipass.org>
On Thu, Sep 29, 2016 at 09:14:51AM +0200, Peter Zijlstra wrote:
> On Thu, Sep 29, 2016 at 04:42:31PM +1000, Nicholas Piggin wrote:
> > Take Alpha instead. It's using 32-bit ops.
>
> Hmm, my Alpha docs are on the other machine, but I suppose the problem
> is 64bit immediates (which would be a common problem I suppose, those
> don't really work well on x86 either).
OK, so from the architecture that have 64bit support, I think Alpha is
the only one that uses 32bit ops and cares.
alpha is weak and uses 32bit ops (fail)
arm64 is weak but uses 64bit ops
ia64 has full barriers and 64bit ops
mips is weak but uses 64bit ops
parisc is horrid but uses 64bit ops
powerpc is weak but uses 64bit ops
s390 has full barriers and uses 64bit ops
sparc has full barriers and uses 64bit ops (if I read the asm right)
tile is weak but uses 64bit ops
x86 has full barriers and uses byte ops
So we could just fix Alpha..
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next prev parent reply other threads:[~2016-09-29 7:44 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-26 20:58 page_waitqueue() considered harmful Linus Torvalds
2016-09-26 21:23 ` Rik van Riel
2016-09-26 21:30 ` Linus Torvalds
2016-09-26 23:11 ` Kirill A. Shutemov
2016-09-27 1:01 ` Rik van Riel
2016-09-27 7:30 ` Peter Zijlstra
2016-09-27 8:54 ` Mel Gorman
2016-09-27 9:11 ` Kirill A. Shutemov
2016-09-27 9:42 ` Mel Gorman
2016-09-27 9:52 ` Minchan Kim
2016-09-27 12:11 ` Kirill A. Shutemov
2016-09-29 8:01 ` Peter Zijlstra
2016-09-29 12:55 ` Nicholas Piggin
2016-09-29 13:16 ` Peter Zijlstra
2016-09-29 13:54 ` Nicholas Piggin
2016-09-29 15:05 ` Rik van Riel
2016-09-27 8:03 ` Jan Kara
2016-09-27 8:31 ` Mel Gorman
2016-09-27 14:34 ` Peter Zijlstra
2016-09-27 15:08 ` Nicholas Piggin
2016-09-27 16:31 ` Linus Torvalds
2016-09-27 16:49 ` Peter Zijlstra
2016-09-28 10:45 ` Mel Gorman
2016-09-28 11:11 ` Peter Zijlstra
2016-09-28 16:10 ` Linus Torvalds
2016-09-29 13:08 ` Peter Zijlstra
2016-10-03 10:47 ` Mel Gorman
2016-09-27 14:53 ` Nicholas Piggin
2016-09-27 15:17 ` Nicholas Piggin
2016-09-27 16:52 ` Peter Zijlstra
2016-09-27 17:06 ` Nicholas Piggin
2016-09-28 7:05 ` Peter Zijlstra
2016-09-28 11:05 ` Paul E. McKenney
2016-09-28 11:16 ` Peter Zijlstra
2016-09-28 12:58 ` Paul E. McKenney
2016-09-29 1:31 ` Nicholas Piggin
2016-09-29 2:12 ` Paul E. McKenney
2016-09-29 6:21 ` Peter Zijlstra
2016-09-29 6:42 ` Nicholas Piggin
2016-09-29 7:14 ` Peter Zijlstra
2016-09-29 7:43 ` Peter Zijlstra [this message]
2016-09-28 7:40 ` Mel Gorman
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