From: Matt Evans <matt@ozlabs.org>
To: Pekka Enberg <penberg@kernel.org>
Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
asias.hejun@gmail.com, levinsasha928@gmail.com,
gorcunov@gmail.com, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH V2 17/23] kvm tools: Add ability to map guest RAM from hugetlbfs
Date: Mon, 12 Dec 2011 16:17:29 +1100 [thread overview]
Message-ID: <4EE58E69.40006@ozlabs.org> (raw)
In-Reply-To: <CAOJsxLGVoqWmhVzu2_4HhnQNbwaVp4GW-FRP-27UPWtCAxSyRg@mail.gmail.com>
On 09/12/11 19:42, Pekka Enberg wrote:
> On Fri, Dec 9, 2011 at 8:55 AM, Matt Evans <matt@ozlabs.org> wrote:
>> Add a --hugetlbfs commandline option to give a path to hugetlbfs-map guest
>> memory (down in kvm__arch_init()). For x86, guest memory is a normal
>> ANON mmap() if this option is not provided, otherwise a hugetlbfs mmap.
>>
>> Signed-off-by: Matt Evans <matt@ozlabs.org>
>
> Btw, why don't you want to use MADV_HUGEPAGE for this? You could just
> do it unconditionally, no?
Well, I'm manually mapping from hugetlbfs as currently* PPC KVM requires
hugepages to back guest RAM and MADV_HUGEPAGE is just a hint, no? I also wanted
things to work on kernels without transparent hugepages enabled. I think it's
safer to do things explicitly, as if the user requests hugepages it's more
transparent (I'm thinking benchmarking, etc.) to be definitely using hugepages.
Cheers,
Matt
*: I know Paul's posted patches to implement smallpage support... so this will
change in time.
next prev parent reply other threads:[~2011-12-12 5:17 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1323413420.git.matt@ozlabs.org>
2011-12-09 6:52 ` [PATCH V2 01/23] kvm tools: Only build/init i8042 on x86 Matt Evans
2011-12-09 6:52 ` [PATCH V2 03/23] kvm tools: Re-arrange Makefile to heed CFLAGS before checking for optional libs Matt Evans
2011-12-09 6:53 ` [PATCH V2 02/23] kvm tools: Add Makefile parameter for kernel include path Matt Evans
2011-12-09 6:53 ` [PATCH V2 04/23] kvm tools: Get correct 64-bit types on PPC64 and link appropriately Matt Evans
2011-12-09 8:24 ` Sasha Levin
2011-12-09 8:29 ` Pekka Enberg
2011-12-12 1:03 ` Matt Evans
2011-12-12 5:57 ` Pekka Enberg
2011-12-13 6:44 ` Matt Evans
2011-12-09 6:53 ` [PATCH V2 05/23] kvm tools: Add arch-specific KVM_RUN exit handling via kvm_cpu__handle_exit() Matt Evans
2011-12-09 6:54 ` [PATCH V2 06/23] kvm tools: Don't die if KVM_CAP_NR_VCPUS isn't available Matt Evans
2011-12-09 6:54 ` [PATCH V2 07/23] kvm tools: Fix KVM_RUN exit code check Matt Evans
2011-12-09 6:54 ` [PATCH V2 08/23] kvm tools: Add kvm__arch_periodic_poll() Matt Evans
2011-12-09 6:54 ` [PATCH V2 09/23] kvm tools: Move arch-specific cmdline init into kvm__arch_set_cmdline() Matt Evans
2011-12-09 6:54 ` [PATCH V2 10/23] kvm tools: Add CONSOLE_HV term type and allow it to be selected Matt Evans
2011-12-09 6:54 ` [PATCH V2 11/23] kvm tools: Fix term_getc(), term_getc_iov() endian bugs Matt Evans
2011-12-09 6:54 ` [PATCH V2 12/23] kvm tools: Allow initrd_check() to match a cpio Matt Evans
2011-12-09 6:54 ` [PATCH V2 13/23] kvm tools: Allow load_flat_binary() to load an initrd alongside Matt Evans
2011-12-09 6:55 ` [PATCH V2 14/23] kvm tools: Initialise PCI before devices start getting registered with PCI Matt Evans
2011-12-09 6:55 ` [PATCH V2 15/23] kvm tools: Perform CPU and firmware setup after devices are added Matt Evans
2011-12-09 6:55 ` [PATCH V2 16/23] kvm tools: Init IRQs after determining nrcpus Matt Evans
2011-12-09 6:55 ` [PATCH V2 17/23] kvm tools: Add ability to map guest RAM from hugetlbfs Matt Evans
2011-12-09 7:39 ` Sasha Levin
2011-12-12 5:05 ` Matt Evans
2011-12-09 8:38 ` Pekka Enberg
2011-12-12 6:19 ` Matt Evans
2011-12-09 8:42 ` Pekka Enberg
2011-12-12 5:17 ` Matt Evans [this message]
2011-12-12 6:06 ` Pekka Enberg
2011-12-09 6:55 ` [PATCH V2 18/23] kvm tools: Move PCI_MAX_DEVICES to pci.h Matt Evans
2011-12-09 6:55 ` [PATCH V2 19/23] kvm tools: Endian-sanitise pci.h and PCI device setup Matt Evans
2011-12-09 6:55 ` [PATCH V2 20/23] kvm tools: Correctly set virtio-pci bar_size and remove hardwired address Matt Evans
2011-12-09 6:55 ` [PATCH V2 21/23] kvm tools: Add pci__config_{rd,wr}(), pci__find_dev() Matt Evans
2011-12-09 6:55 ` [PATCH V2 22/23] kvm tools: Arch-specific define for PCI MMIO allocation area Matt Evans
2011-12-09 6:56 ` [PATCH V2 23/23] kvm tools: Create arch-specific kvm_cpu__emulate_{mm}io() Matt Evans
2011-12-09 7:53 ` Sasha Levin
2011-12-12 1:08 ` Matt Evans
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