| Subject | Re: [PATCH 4 of 4] Introduce aio system call submission and completion system calls | From | Andi Kleen <> | Date | 31 Jan 2007 09:58:38 +0100 |
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Zach Brown <zach.brown@oracle.com> writes:
> This finally does something useful with the notion of being able to schedule > stacks as fibrils under a task_struct. Again, i386-specific and in need of > proper layering with archs. > > sys_asys_submit() is added to let userspace submit asynchronous system calls. > It specifies the system call number and arguments. A fibril is constructed for > each call. Each starts with a stack which executes the given system call > handler and then returns to a function which records the return code of the > system call handler. sys_asys_await_completion() then lets userspace collect > these results.
Do you have any numbers how this compares cycle wise to just doing clone+syscall+exit in user space?
If the difference is not too big might it be easier to fix clone+syscall to be more efficient than teach all the rest of the kernel about fibrils?
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