From: Andi Kleen <andi@firstfloor.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>,
npiggin@suse.de, akpm@linux-foundation.org,
Nishanth Aravamudan <nacc@us.ibm.com>,
linux-mm@kvack.org, kniht@us.ibm.com, abh@cray.com,
joachim.deguara@amd.com
Subject: Re: [patch 14/21] x86: add hugepagesz option on 64-bit
Date: Tue, 3 Jun 2008 22:57:52 +0200 [thread overview]
Message-ID: <20080603205752.GK20824@one.firstfloor.org> (raw)
In-Reply-To: <1212519555.8505.33.camel@nimitz.home.sr71.net>
> The downside of something like this is that you have yet another data
> structure to manage. Andi, do you think something like this would be
> workable?
The reason I don't like your proposal is that it makes only sense
with a lot of hugepage sizes being active at the same time. But the
API (one mount per size) doesn't really scale to that anyways.
It should support two (as on x86), three if you stretch it, but
anything beyond would be difficult.
If you really wanted to support a zillion sizes you would at least
first need a different flexible interface that completely hides page
sizes.
Otherwise you would drive both sysadmins and programmers crazy and
overlong command lines would be the smallest of their problems
With two or even three sizes only the whole thing is not needed and my original
scheme works fine IMHO.
That is why I was also sceptical of the newly proposed sysfs interfaces.
For two or three numbers you don't need a sysfs interface.
-Andi
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next prev parent reply other threads:[~2008-06-03 20:57 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-03 9:59 [patch 00/21] hugetlb multi size, giant hugetlb support, etc npiggin
2008-06-03 9:59 ` [patch 01/21] hugetlb: factor out prep_new_huge_page npiggin
2008-06-03 9:59 ` [patch 02/21] hugetlb: modular state npiggin
2008-06-03 10:58 ` [patch 02/21] hugetlb: modular state (take 2) Nick Piggin
2008-06-03 9:59 ` [patch 03/21] hugetlb: multiple hstates npiggin
2008-06-03 10:00 ` [patch 04/21] hugetlbfs: per mount hstates npiggin
2008-06-03 10:00 ` [patch 05/21] hugetlb: new sysfs interface npiggin
2008-06-03 10:00 ` [patch 06/21] hugetlb: abstract numa round robin selection npiggin
2008-06-03 10:00 ` [patch 07/21] mm: introduce non panic alloc_bootmem npiggin
2008-06-03 10:00 ` [patch 08/21] mm: export prep_compound_page to mm npiggin
2008-06-03 10:00 ` [patch 09/21] hugetlb: support larger than MAX_ORDER npiggin
2008-06-03 10:00 ` [patch 10/21] hugetlb: support boot allocate different sizes npiggin
2008-06-03 10:00 ` [patch 11/21] hugetlb: printk cleanup npiggin
2008-06-03 10:00 ` [patch 12/21] hugetlb: introduce pud_huge npiggin
2008-06-03 10:00 ` [patch 13/21] x86: support GB hugepages on 64-bit npiggin
2008-06-03 10:00 ` [patch 14/21] x86: add hugepagesz option " npiggin
2008-06-03 17:48 ` Dave Hansen
2008-06-03 18:24 ` Andi Kleen
2008-06-03 18:59 ` Dave Hansen
2008-06-03 20:57 ` Andi Kleen [this message]
2008-06-03 21:27 ` Dave Hansen
2008-06-04 0:06 ` Andi Kleen
2008-06-04 1:04 ` Nick Piggin
2008-06-04 16:01 ` Dave Hansen
2008-06-06 16:09 ` Dave Hansen
2008-06-05 23:15 ` Nishanth Aravamudan
2008-06-06 0:29 ` Andi Kleen
2008-06-04 1:10 ` Nick Piggin
2008-06-05 23:12 ` Nishanth Aravamudan
2008-06-05 23:23 ` Nishanth Aravamudan
2008-06-03 19:00 ` Dave Hansen
2008-06-03 10:00 ` [patch 15/21] hugetlb: override default huge page size npiggin
2008-06-03 10:00 ` [patch 16/21] hugetlb: allow arch overried hugepage allocation npiggin
2008-06-03 10:00 ` [patch 17/21] powerpc: function to allocate gigantic hugepages npiggin
2008-06-03 10:00 ` [patch 18/21] powerpc: scan device tree for gigantic pages npiggin
2008-06-03 10:00 ` [patch 19/21] powerpc: define support for 16G hugepages npiggin
2008-06-03 10:00 ` [patch 20/21] fs: check for statfs overflow npiggin
2008-06-03 10:00 ` [patch 21/21] powerpc: support multiple hugepage sizes npiggin
2008-06-03 10:29 ` [patch 1/1] x86: get_user_pages_lockless support 1GB hugepages Nick Piggin
2008-06-03 10:57 ` [patch 00/21] hugetlb multi size, giant hugetlb support, etc Nick Piggin
2008-06-06 17:12 ` Andy Whitcroft
2008-06-04 8:29 ` Andrew Morton
2008-06-04 9:35 ` Nick Piggin
2008-06-04 9:46 ` Andrew Morton
2008-06-04 11:04 ` Nick Piggin
2008-06-04 11:33 ` Nick Piggin
2008-06-04 11:57 ` Andi Kleen
2008-06-04 18:39 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2008-06-04 11:29 [patch 00/21] hugetlb patches resend npiggin
2008-06-04 11:29 ` [patch 14/21] x86: add hugepagesz option on 64-bit npiggin
2008-06-04 17:51 ` Randy Dunlap
2008-06-05 2:01 ` Nick Piggin
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