On 07/12/2011 11:38 AM, Peter Zijlstra wrote:
On Tue, 2011-07-12 at 10:20 +0300, Avi Kivity wrote: > Maybe we need a generic "run this function in this task's context" > mechanism instead. Like an IPI, but targeting tasks instead of cpus. > kernel/event/core.c:task_function_call() like?
Similar, but with stronger guarantees: when the function is called, current == p, and the task was either sleeping or in userspace.
This can be used to reduce synchronization requirements between tasks. For example, you can set a task-local bit flag with this, without atomics. If this is rare enough, it's a net win compared to adding atomics.
aio completions might also make use of this. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
