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Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integ
From: |
Fabrice Bellard |
Subject: |
Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems? |
Date: |
Tue, 06 Nov 2007 21:05:00 +0100 |
User-agent: |
Thunderbird 1.5.0.9 (X11/20070212) |
Paul Brook wrote:
> [...]
> Personally I like the locking interface as it allows a zero-copy
> implementation. However the kernel uses a copying interface, and my
> understanding is that other qemu maintainers also prefer the copying
> interface.
At least I don't think it is critical performance wise, especially if
the page flag checks are added ! Before you added the current zero copy
interface, my plan was to use a zero copy interface just for big buffers
such as the one for read/write.
Another point is that the code from signal.c is not converted to the
zero-copy interface and it is a significant source of complexity as
there is a large amount of target specific code copied from the Linux
kernel to generate the stack frame.
Regards,
Fabrice.
- [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, TJ, 2007/11/03
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Paul Brook, 2007/11/03
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Thayne Harbaugh, 2007/11/05
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Paul Brook, 2007/11/05
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Thayne Harbaugh, 2007/11/05
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Fabrice Bellard, 2007/11/07
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Thayne Harbaugh, 2007/11/07
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Paul Brook, 2007/11/07
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Thayne Harbaugh, 2007/11/12
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?,
Fabrice Bellard <=
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Stuart Anderson, 2007/11/06
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Paul Brook, 2007/11/06
- Re: [Qemu-devel] RFC: x86_64 Best way to fix 'cast to pointer from integer of different size' problems?, Stuart Anderson, 2007/11/06