xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf: Extend the mmap control page with time (TSC) fields

Browse Source 
Extend the mmap control page with fields so that userspace can compute
time deltas relative to the provided time fields.

Currently only implemented for x86 with constant and nonstop TSC.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Arun Sharma <asharma@fb.com>
Link: http://lkml.kernel.org/n/tip-3u1jucza77j3wuvs0x2bic0f@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2011-11-21 11:43:53 +01:00
committed by Ingo Molnar
parent 0c9d42ed4c
commit e3f3541c19
3 changed files with 31 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/perf_event.h
View File

@@ -291,12 +291,14 @@ struct perf_event_mmap_page {
__s64 offset; /* add to hardware event value */
__u64 time_enabled; /* time event active */
__u64 time_running; /* time event on cpu */
__u32 time_mult, time_shift;
__u64 time_offset;
/*
* Hole for extension of the self monitor capabilities
*/
__u64 __reserved[123]; /* align to 1k */
__u64 __reserved[121]; /* align to 1k */
/*
* Control data for the mmap() data buffer.