From: Andrew Morton <akpm@linux-foundation.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Tejun Heo <tj@kernel.org>, Ralf Baechle <ralf@linux-mips.org>,
aaditya.kumar.30@gmail.com, kamezawa.hiroyu@jp.fujitsu.com,
linux-mm@kvack.org, Johannes Weiner <hannes@cmpxchg.org>,
Yinghai Lu <yinghai@kernel.org>
Subject: Re: + memory-hotplug-fix-kswapd-looping-forever-problem-fix-fix.patch added to -mm tree
Date: Fri, 20 Jul 2012 14:22:13 -0700 [thread overview]
Message-ID: <20120720142213.f4a4a68e.akpm@linux-foundation.org> (raw)
In-Reply-To: <20120719235057.GA21012@bbox>
On Fri, 20 Jul 2012 08:50:57 +0900
Minchan Kim <minchan@kernel.org> wrote:
> >
> > But, really, given how the structure is used, I think we're better off
> > just making sure all archs clear them and maybe have a sanity check or
> > two just in case. It's not like breakage on that front is gonna be
> > subtle.
>
> Of course, it seems all archs seems to zero-out already as I mentioned
> (Not sure, MIPS) but Andrew doesn't want it. Andrew?
My point is that having to ensure that each arch zeroes out this
structure is difficult/costly/unreliable/fragile. It would be better
if we can reliably clear it at some well-known place in core MM.
That might mean that the memory gets cleared twice on some
architectures, but I doubt if that matters - it's a once-off thing.
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next prev parent reply other threads:[~2012-07-20 21:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20120717233115.A8E411E005C@wpzn4.hot.corp.google.com>
2012-07-18 1:22 ` + memory-hotplug-fix-kswapd-looping-forever-problem-fix-fix.patch added to -mm tree Minchan Kim
2012-07-18 21:38 ` Andrew Morton
2012-07-19 0:10 ` Minchan Kim
2012-07-19 0:21 ` Tejun Heo
2012-07-19 0:48 ` Minchan Kim
2012-07-19 16:57 ` Tejun Heo
2012-07-19 23:50 ` Minchan Kim
2012-07-20 17:15 ` Tejun Heo
2012-07-20 21:22 ` Andrew Morton [this message]
2012-07-20 21:36 ` Tejun Heo
2012-07-23 4:58 ` Minchan Kim
2012-07-23 15:42 ` Tejun Heo
2012-07-24 1:11 ` Minchan Kim
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