Files
kernel_arpi/include/uapi/linux
Peter Zijlstra 6c0246a458 perf: Add perf_event_mmap_page::cap_user_time_short ABI
In order to support short clock counters, provide an ABI extension.

As a whole:

    u64 time, delta, cyc = read_cycle_counter();

+   if (cap_user_time_short)
+	cyc = time_cycle + ((cyc - time_cycle) & time_mask);

    delta = mul_u64_u32_shr(cyc, time_mult, time_shift);

    if (cap_user_time_zero)
	time = time_zero + delta;

    delta += time_offset;

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20200716051130.4359-6-leo.yan@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
2020-07-20 11:50:47 +01:00
..
2020-05-28 11:22:14 +02:00
2019-12-18 18:07:31 +01:00
2019-10-09 22:31:14 -04:00
2019-09-25 17:51:39 -07:00
2020-06-01 11:49:23 -07:00
2020-04-27 16:29:41 +05:30
2020-06-24 21:34:11 +02:00
2020-05-14 16:44:25 +02:00
2020-05-28 22:09:47 -04:00
2019-12-11 15:31:52 +01:00
2020-04-20 12:43:24 -07:00
2020-05-17 14:10:07 -06:00
2020-05-01 10:00:19 -04:00
2020-05-21 08:20:35 -06:00
2020-03-29 22:30:57 -07:00
2020-03-29 22:14:49 -07:00
2020-01-18 09:19:18 -05:00
2019-10-02 20:32:27 -06:00
2020-05-21 17:04:07 -07:00
2020-03-29 22:30:57 -07:00
2020-01-26 15:28:47 +01:00
2019-12-18 18:07:31 +01:00
2019-12-09 09:59:07 +01:00
2020-03-29 23:29:08 +02:00
2019-09-18 20:17:50 +02:00
2020-04-20 07:26:42 +02:00