From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Matthew Wilcox <willy@infradead.org>,
Nicholas Piggin <npiggin@gmail.com>
Cc: linux-arch@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Will Deacon <will@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 4/4] mm/vmalloc: Hugepage vmalloc mappings
Date: Tue, 14 Apr 2020 14:28:35 +0200 [thread overview]
Message-ID: <36616218-1d3a-b18a-8fb8-4fc9eff22780@c-s.fr> (raw)
In-Reply-To: <20200413134106.GN21484@bombadil.infradead.org>
Le 13/04/2020 à 15:41, Matthew Wilcox a écrit :
> On Mon, Apr 13, 2020 at 10:53:03PM +1000, Nicholas Piggin wrote:
>> +static int vmap_pages_range_noflush(unsigned long start, unsigned long end,
>> + pgprot_t prot, struct page **pages,
>> + unsigned int page_shift)
>> +{
>> + if (page_shift == PAGE_SIZE) {
>
> ... I think you meant 'page_shift == PAGE_SHIFT'
>
> Overall I like this series, although it's a bit biased towards CPUs
> which have page sizes which match PMD/PUD sizes. It doesn't offer the
> possibility of using 64kB page sizes on ARM, for example. But it's a
> step in the right direction.
>
I was going to ask more or less the same question, I would have liked to
use 512kB hugepages on powerpc 8xx.
Even the 8M hugepages (still on the 8xx), can they be used as well,
taking into account that two PGD entries have to point to the same 8M page ?
I sent out a series which tends to make the management of 512k and 8M
pages closer to what Linux expects, in order to use them inside kernel,
for Linear mappings and Kasan mappings for the moment. See
https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=164620
It would be nice if we could amplify it a use it for ioremaps and
vmallocs as well.
Christophe
next prev parent reply other threads:[~2020-04-14 12:28 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-13 12:52 [PATCH v2 0/4] huge vmalloc mappings Nicholas Piggin
2020-04-13 12:53 ` [PATCH v2 1/4] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings Nicholas Piggin
2020-04-13 13:34 ` Matthew Wilcox
2020-04-14 11:31 ` Nicholas Piggin
2020-04-13 12:53 ` [PATCH v2 2/4] mm: Move ioremap page table mapping function to mm/ Nicholas Piggin
2020-04-13 12:53 ` [PATCH v2 3/4] mm: HUGE_VMAP arch query functions cleanup Nicholas Piggin
2020-04-13 20:17 ` kbuild test robot
2020-04-13 20:29 ` kbuild test robot
2020-04-13 23:56 ` kbuild test robot
2020-04-13 23:56 ` [PATCH] mm: fix boolreturn.cocci warnings kbuild test robot
2020-04-13 12:53 ` [PATCH v2 4/4] mm/vmalloc: Hugepage vmalloc mappings Nicholas Piggin
2020-04-13 13:41 ` Matthew Wilcox
2020-04-14 11:39 ` Nicholas Piggin
2020-04-14 12:28 ` Christophe Leroy [this message]
2020-04-14 14:20 ` Matthew Wilcox
2020-04-14 7:23 ` Christoph Hellwig
2020-04-14 12:13 ` Nicholas Piggin
2020-04-14 13:02 ` Christoph Hellwig
2020-04-14 14:48 ` Nicholas Piggin
2020-04-15 10:47 ` Will Deacon
2020-04-16 2:38 ` Nicholas Piggin
2020-07-01 7:10 ` Zefan Li
2020-07-03 0:15 ` Nicholas Piggin
2020-07-20 2:02 ` Zefan Li
2020-07-20 2:49 ` Nicholas Piggin
2020-04-14 0:27 ` [PATCH v2 0/4] huge " David Rientjes
2020-04-14 12:23 ` Nicholas Piggin
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