From: David Daney <ddaney.cavm@gmail.com>
To: Joshua Kinard <kumba@gentoo.org>
Cc: Ralf Baechle <ralf@linux-mips.org>,
Linux MIPS List <linux-mips@linux-mips.org>
Subject: Re: IP27: CONFIG_TRANSPARENT_HUGEPAGE triggers bus errors
Date: Fri, 07 Nov 2014 10:30:28 -0800 [thread overview]
Message-ID: <545D0FC4.7020205@gmail.com> (raw)
In-Reply-To: <545C9D4D.4090501@gentoo.org>
On 11/07/2014 02:22 AM, Joshua Kinard wrote:
[...]
>
> So my guess is unless hugepages can happen in powers of 4,
Huge pages are currently only supported on MIPS64 for this reason.
huge_page_mask_size = (normal_page_size/8 * normal_page_size) / 2;
If you take log2 of everything you get
huge_page_mask_bits = normal_page_bits - 3 + normal_page_bits - 1
= 2 * normal_page_bits - 4 (always even)
So all page sizes result in huge pages that meet the power of 4 criterion.
> they're not
> compatible w/ the R10K-series (and likely not the R5K/RM7K, either, since they
> all have the same 24:13 bits in the PageMask register). It seems the logical
> choice would be to remove 'select CPU_SUPPORTS_HUGEPAGES' from CPU_R5000,
> CPU_NEVADA, CPU_R10000, and CPU_RM7000 in arch/mips/Kconfig.
>
next prev parent reply other threads:[~2014-11-07 18:30 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-02 10:53 IP27: CONFIG_TRANSPARENT_HUGEPAGE triggers bus errors Joshua Kinard
2014-11-03 18:52 ` David Daney
2014-11-04 1:08 ` Joshua Kinard
2014-11-04 1:23 ` David Daney
2014-11-04 1:34 ` Joshua Kinard
2014-11-04 1:43 ` David Daney
2014-11-04 5:51 ` Joshua Kinard
2014-11-05 9:07 ` Joshua Kinard
2014-11-05 10:21 ` Ralf Baechle
2014-11-05 16:09 ` Ralf Baechle
2014-11-07 10:22 ` Joshua Kinard
2014-11-07 18:30 ` David Daney [this message]
2014-11-09 0:09 ` Joshua Kinard
2014-11-10 7:04 ` Joshua Kinard
2014-11-10 10:51 ` Ralf Baechle
2014-11-10 11:20 ` Thomas Bogendoerfer
2014-11-10 14:22 ` Joshua Kinard
2014-11-10 16:55 ` David Daney
2014-11-10 17:03 ` Ralf Baechle
2014-11-10 17:29 ` David Daney
2014-11-11 11:11 ` Joshua Kinard
2014-11-10 21:30 ` Thomas Bogendoerfer
2014-11-11 7:47 ` Ralf Baechle
2014-11-11 9:24 ` Thomas Bogendoerfer
2014-11-11 9:38 ` Ralf Baechle
2014-11-10 11:22 ` Joshua Kinard
2014-11-05 13:52 ` Ralf Baechle
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