From: Avi Kivity <avi@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] [PATCH 14/23] memory: transaction API
Date: Tue, 26 Jul 2011 13:48:06 +0300 [thread overview]
Message-ID: <4E2E9B66.1080308@redhat.com> (raw)
In-Reply-To: <4E2DC10A.4040005@codemonkey.ws>
On 07/25/2011 10:16 PM, Anthony Liguori wrote:
> On 07/25/2011 09:02 AM, Avi Kivity wrote:
>> Allow changes to the memory hierarchy to be accumulated and
>> made visible all at once. This reduces computational effort,
>> especially when an accelerator (e.g. kvm) is involved.
>>
>> Useful when a single register update causes multiple changes
>> to an address space.
>>
>> Signed-off-by: Avi Kivity<avi@redhat.com>
>
> What's the motivation for this? Was this just because it seemed neat
> to do or did you run into a performance issue you were trying to solve?
Both cirrus and 440fx need this; look at i440fx_update_memory_mappings()
for example, it blindly updates mappings even for PAMs which haven't
changed.
These issues can be also solved by more care on the caller's side, or by
making the API richer, but it's good to have a no-thought-required
solution, particularly as it's so easy to do.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-07-26 10:48 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-25 14:02 [Qemu-devel] [PATCH 00/23] Memory API, batch 1 Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 01/23] Hierarchical memory region API Avi Kivity
2011-07-25 18:41 ` Anthony Liguori
2011-07-26 9:35 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 02/23] memory: implement dirty tracking Avi Kivity
2011-07-25 18:43 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 03/23] memory: merge adjacent segments of a single memory region Avi Kivity
2011-07-25 18:48 ` Anthony Liguori
2011-07-26 9:55 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 04/23] Internal interfaces for memory API Avi Kivity
2011-07-25 18:49 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 05/23] memory: abstract address space operations Avi Kivity
2011-07-25 18:51 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 06/23] memory: rename MemoryRegion::has_ram_addr to ::terminates Avi Kivity
2011-07-25 18:56 ` Anthony Liguori
2011-07-26 9:59 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 07/23] memory: late initialization of ram_addr Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 08/23] memory: I/O address space support Avi Kivity
2011-07-25 19:00 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 09/23] memory: add backward compatibility for old portio registration Avi Kivity
2011-07-25 19:01 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 10/23] memory: add backward compatibility for old mmio registration Avi Kivity
2011-07-25 19:02 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 11/23] memory: add ioeventfd support Avi Kivity
2011-07-25 15:16 ` malc
2011-07-25 15:17 ` Avi Kivity
2011-07-25 15:22 ` malc
2011-07-25 15:28 ` Avi Kivity
2011-07-25 15:38 ` malc
2011-07-25 15:43 ` Avi Kivity
2011-07-25 19:08 ` Anthony Liguori
2011-07-26 10:08 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 12/23] memory: separate building the final memory map into two steps Avi Kivity
2011-07-25 19:12 ` Anthony Liguori
2011-07-26 10:43 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 13/23] memory: document the memory API Avi Kivity
2011-07-25 19:15 ` Anthony Liguori
2011-07-26 10:44 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 14/23] memory: transaction API Avi Kivity
2011-07-25 19:16 ` Anthony Liguori
2011-07-26 10:48 ` Avi Kivity [this message]
2011-07-26 11:39 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 15/23] exec.c: initialize memory map Avi Kivity
2011-07-25 19:17 ` Anthony Liguori
2011-07-26 10:55 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 16/23] ioport: register ranges by byte aligned addresses always Avi Kivity
2011-07-25 19:20 ` Anthony Liguori
2011-07-26 10:59 ` Avi Kivity
2011-07-25 14:02 ` [Qemu-devel] [PATCH 17/23] pc: grab system_memory Avi Kivity
2011-07-25 19:22 ` Anthony Liguori
2011-07-25 14:02 ` [Qemu-devel] [PATCH 18/23] pc: convert pc_memory_init() to memory API Avi Kivity
2011-07-25 19:23 ` Anthony Liguori
2011-07-25 14:03 ` [Qemu-devel] [PATCH 19/23] pc: move global memory map out of pc_init1() and into its callers Avi Kivity
2011-07-25 20:02 ` Anthony Liguori
2011-07-26 11:02 ` Avi Kivity
2011-07-25 14:03 ` [Qemu-devel] [PATCH 20/23] pci: pass address space to pci bus when created Avi Kivity
2011-07-25 20:03 ` Anthony Liguori
2011-07-25 14:03 ` [Qemu-devel] [PATCH 21/23] pci: add MemoryRegion based BAR management API Avi Kivity
2011-07-25 20:20 ` Anthony Liguori
2011-07-26 11:06 ` Avi Kivity
2011-07-25 14:03 ` [Qemu-devel] [PATCH 22/23] sysbus: add MemoryRegion based memory " Avi Kivity
2011-07-25 20:21 ` Anthony Liguori
2011-07-25 14:03 ` [Qemu-devel] [PATCH 23/23] usb-ohci: convert to MemoryRegion Avi Kivity
2011-07-25 20:22 ` Anthony Liguori
2011-07-25 20:23 ` [Qemu-devel] [PATCH 00/23] Memory API, batch 1 Anthony Liguori
2011-07-26 11:32 ` Avi Kivity
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E2E9B66.1080308@redhat.com \
--to=avi@redhat.com \
--cc=anthony@codemonkey.ws \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).