On 09/22/2009 05:32 PM, Ingo Molnar wrote:
* Avi Kivity<avi@xxxxxxxxxx> wrote:
On 09/19/2009 09:40 AM, Avi Kivity wrote:
Add a general per-cpu notifier that is called whenever the kernel is
about to return to userspace. The notifier uses a thread_info flag
and existing checks, so there is no impact on user return or context
switch fast paths.
Ingo/Peter?
Would be nice to convert some existing open-coded return-to-user-space
logic to this facility. One such candidate would be lockdep_sys_exit?
I only implemented this for x86, while lockdep is arch independent. If
arch support is added, it should be trivial.
I think perf counters could use preempt notifiers though, these are arch
independent.
--
error compiling committee.c: too many arguments to function
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