Re: [PATCH 3/3] context_tracking,x86: remove extraneous irq disable & enable from context tracking on syscall entry

[Rik van Riel]

On 05/01/2015 12:37 PM, Ingo Molnar wrote:

> Also note that this bit in context_tracking_enter():
> 
>                         if (state == CONTEXT_USER) {
>                                 trace_user_enter(0);
>                                 vtime_user_enter(current);
>                         }
> 
> 
> is related to precise time measurement of user/kernel execution times, 
> it's not needed by the scheduler at all, it's just exported to 
> tooling. It's not fundamental to the scheduler.

Any objections to the idea from the other thread to simply keep
the time accumulating in buffers in local_clock() units, and
only update the task vtime once a second or so?

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