From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
Minchan Kim <minchan.kim@gmail.com>,
Yinghai Lu <yinghai@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shaohua Li <shaohua.li@intel.com>,
Yakui Zhao <yakui.zhao@intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
arm-kernel@lists.infradead.org, kgene.kim@samsung.com,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: [RFC] Tight check of pfn_valid on sparsemem
Date: Tue, 13 Jul 2010 16:58:08 +0900 [thread overview]
Message-ID: <20100713165808.e340e6dc.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20100713163417.17895202.kamezawa.hiroyu@jp.fujitsu.com>
On Tue, 13 Jul 2010 16:34:17 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> Anyway, sparsemem is designed to be aligned to SECTION_SIZE of memmap.
> Please avoid adding new Spaghetti code without proper configs.
> Thanks,
Ok, I realized I misunderstand all. Arm doesn't unmap memmap but reuse the page
for memmap without modifing ptes. My routine only works when ARM uses sparsemem_vmemmap.
But yes, it isn't.
Hmm...How about using pfn_valid() for FLATMEM or avoid using SPARSEMEM ?
If you want conrols lower than SPARSEMEM, FLATMEM works better because ARM unmaps memmap.
What is the reason for SPARSEMEM ?
Thanks,
-Kame
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next prev parent reply other threads:[~2010-07-13 8:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-12 15:53 Minchan Kim
2010-07-12 23:59 ` Kukjin Kim
2010-07-13 3:19 ` KAMEZAWA Hiroyuki
2010-07-13 4:11 ` Minchan Kim
2010-07-13 4:23 ` KAMEZAWA Hiroyuki
2010-07-13 6:04 ` Minchan Kim
2010-07-13 6:40 ` KAMEZAWA Hiroyuki
2010-07-13 8:06 ` Minchan Kim
2010-07-13 8:03 ` KAMEZAWA Hiroyuki
2010-07-13 7:20 ` Russell King - ARM Linux
2010-07-13 7:34 ` KAMEZAWA Hiroyuki
2010-07-13 7:58 ` KAMEZAWA Hiroyuki [this message]
2010-07-13 8:02 ` KAMEZAWA Hiroyuki
2010-07-13 18:39 ` Russell King - ARM Linux
2010-07-13 20:46 ` Dave Hansen
2010-07-13 9:30 ` Johannes Weiner
2010-07-13 15:43 ` Minchan Kim
2010-07-13 16:35 ` Dave Hansen
2010-07-13 16:44 ` Minchan Kim
2010-07-14 0:23 ` KAMEZAWA Hiroyuki
2010-07-14 6:44 ` Minchan Kim
2010-07-14 7:10 ` KAMEZAWA Hiroyuki
2010-07-14 7:35 ` Minchan Kim
2010-07-14 7:39 ` KAMEZAWA Hiroyuki
2010-07-14 7:50 ` Kukjin Kim
2010-07-14 8:09 ` KAMEZAWA Hiroyuki
2010-07-13 9:37 ` Mel Gorman
2010-07-13 9:46 ` Russell King - ARM Linux
2010-07-13 10:00 ` Mel Gorman
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