perf_events: Add perf_event_time()
perf_events: Add perf_event_time()

Adds perf_event_time() to try and centralize access to event
timing and in particular ctx->time. Prepares for cgroup support.

Signed-off-by: Stephane Eranian <f199ae9781930a5b94b284ca2f471140752002a7@google.com>
Signed-off-by: Peter Zijlstra <645ca7d3a8d3d4f60557176cd361ea8351edc32b@chello.nl>
LKML-Reference: <241a804663071d870535c0c42556171e40c7e257@mx.google.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs