From: Andrew Morton <akpm@linux-foundation.org>
To: David Miller <davem@davemloft.net>
Cc: linux-mm@kvack.org, sparclinux@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
aarcange@redhat.com, hannes@cmpxchg.org,
Gerald Schaefer <gerald.schaefer@de.ibm.com>
Subject: Re: [PATCH 0/8] THP support for Sparc64
Date: Tue, 2 Oct 2012 15:55:44 -0700 [thread overview]
Message-ID: <20121002155544.2c67b1e8.akpm@linux-foundation.org> (raw)
In-Reply-To: <20121002.182601.845433592794197720.davem@davemloft.net>
On Tue, 02 Oct 2012 18:26:01 -0400 (EDT)
David Miller <davem@davemloft.net> wrote:
> Here is a set of patches that add THP support for sparc64.
>
> A few of them are relatively minor portability issues I ran into.
> Like the MIPS guys I hit the update_mmu_cache() typing issue so I have
> a patch for that here.
>
> It is very likely that I need the ACCESSED bit handling fix the
> ARM folks have been posting recently as well.
>
> On the sparc64 side the biggest issue was moving to only supporting
> 4MB pages and then realigning the page tables so that the PMDs map 4MB
> (instead of 8MB as they do now).
>
> The rest was just trial and error, running tests, and fixing bugs.
>
> A familiar test case that makes 5 million random accesses to a 1GB
> memory area goes from 20 seconds down to 0.43 seconds with THP enabled
> on my SPARC T4-2 box.
Hardly worth bothering about ;)
I had a shot at integrating all this onto the pending stuff in linux-next.
"mm: Add and use update_mmu_cache_pmd() in transparent huge page code."
needed minor massaging in huge_memory.c. But as Andrea mentioned, we
ran aground on Gerald's
http://ozlabs.org/~akpm/mmotm/broken-out/thp-remove-assumptions-on-pgtable_t-type.patch,
part of the thp-for-s390 work.
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next prev parent reply other threads:[~2012-10-02 22:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-02 22:26 [PATCH 0/8] THP support for Sparc64 David Miller
2012-10-02 22:55 ` Andrew Morton [this message]
2012-10-03 0:53 ` David Miller
2012-10-04 2:00 ` David Miller
2012-10-04 10:35 ` Andrea Arcangeli
2012-10-04 18:11 ` David Miller
2012-10-05 9:28 ` Michal Hocko
2012-10-05 11:57 ` Andrea Arcangeli
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