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- W6238085 abstract "Now that Linux has fast system calls, good (and getting better) threading, and cheap context switches, it’s possible to write device drivers that live in user space for whole new classes of devices. Of course, some device drivers (Xfree, in particular) have always run in user space, with a little bit of kernel support. With a little bit more kernel support (a way to set up and tear down DMA safely, and a generalised way to be informed of and control interrupts) almost any PCI bus-mastering device could have a user-mode device driver. I shall talk about the benefits and drawbacks of device drivers being in user space or kernel space, and show that performance concerns are not really an issue—in fact, on some platforms, our user-mode IDE driver out-performs the in-kernel one. I shall also present profiling and benchmark results that show where time is spent in in-kernel and user-space drivers, and describe the infrastructure I’ve added to the Linux kernel to allow portable, efficient userspace drivers to be written. ∗This work was funded by HP, National ICT Australia, the ARC, and the University of NSW through the Gelato programme (http://www.gelato.unsw. edu.au)" @default.
- W6238085 created "2016-06-24" @default.
- W6238085 creator A5069250135 @default.
- W6238085 date "2004-01-01" @default.
- W6238085 modified "2023-09-26" @default.
- W6238085 title "Get more device drivers out of the kernel" @default.
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