From: Paolo Bonzini <pbonzini@redhat.com>
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
Peter Maydell <peter.maydell@linaro.org>
Cc: "QEMU Developers" <qemu-devel@nongnu.org>,
"Blue Swirl" <blauwirbel@gmail.com>,
"Anthony Liguori" <aliguori@amazon.com>,
pcrost@xilinx.com, "Andreas Färber" <afaerber@suse.de>,
"Aurelien Jarno" <aurelien@aurel32.net>,
"Richard Henderson" <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v4 00/22] Steps towards per CPU address-spaces
Date: Tue, 11 Feb 2014 22:40:42 +0100 [thread overview]
Message-ID: <52FA98DA.8030808@redhat.com> (raw)
In-Reply-To: <20140210235315.GB25819@xsjedgari30.xlnx.xilinx.com>
Il 11/02/2014 00:53, Edgar E. Iglesias ha scritto:
>> > Is there that much overhead to creating an AS per master? I guess
>> > you end up recalculating the same memory flatview for every AS
>> > when a memory region gets mapped or unmapped.
>> > In any case, if it's OK to share AddressSpaces between masters
>> > then we can relatively easily do so, since there's already a list
>> > of all AddressSpaces that you can run through to find the one
>> > whose root MemoryRegion is the one you want. (Probably needs
>> > a refcount in the AddressSpace struct as well.)
> Right, something like that might be worthwhile.
>
> It might not make much difference until we start ramping
> things up significantly (in terms of amount of masters).
We already have a decent amount of masters for PCI, where each device
that can do bus-master DMA has basically its own copy of
address_space_memory. It has never been a problem in terms of time
spent updating the ASes.
Paolo
prev parent reply other threads:[~2014-02-11 21:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-03 9:44 [Qemu-devel] [PATCH v4 00/22] Steps towards per CPU address-spaces Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 01/22] exec: Make tb_invalidate_phys_addr input an AS Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 02/22] exec: Make iotlb_to_region " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 03/22] exec: Always initialize MemorySection address spaces Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 04/22] exec: Make memory_region_section_get_iotlb use section AS Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 05/22] memory: Add MemoryListener to typedefs.h Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 06/22] cpu: Add per-cpu address space Edgar E. Iglesias
2014-02-11 19:52 ` Andreas Färber
2014-02-14 5:36 ` Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 07/22] exec: On AS changes, only flush affected CPU TLBs Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 08/22] exec: Make ldl_*_phys input an AddressSpace Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 09/22] exec: Make ldq/ldub_*_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 10/22] exec: Make lduw_*_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 11/22] exec: Make stq_*_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 12/22] exec: Make stl_*_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 13/22] exec: Make stl_phys_notdirty " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 14/22] exec: Make stw_*_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 15/22] exec: Make stb_phys " Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 16/22] exec: Make cpu_physical_memory_write_rom input an AS Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 17/22] exec: Make cpu_memory_rw_debug use the CPUs AS Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 18/22] memory: Add address_space_find_by_name() Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 19/22] qdev: Add qdev property type for AddressSpaces Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 20/22] cpu: Add address-space property Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 21/22] petalogix-ml605: Create the CPU with object_new() Edgar E. Iglesias
2014-02-03 9:44 ` [Qemu-devel] [PATCH v4 22/22] petalogix-ml605: Make the LMB visible only to the CPU Edgar E. Iglesias
2014-02-05 18:44 ` [Qemu-devel] [PATCH v4 00/22] Steps towards per CPU address-spaces Peter Maydell
2014-02-06 1:40 ` Edgar E. Iglesias
2014-02-09 13:31 ` Andreas Färber
2014-02-09 14:21 ` Peter Maydell
2014-02-09 22:15 ` Paolo Bonzini
2014-02-10 9:23 ` Peter Maydell
2014-02-10 17:04 ` Paolo Bonzini
2014-02-10 23:10 ` Edgar E. Iglesias
2014-02-10 23:42 ` Peter Maydell
2014-02-10 23:53 ` Edgar E. Iglesias
2014-02-11 21:40 ` Paolo Bonzini [this message]
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