summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorKurt Kanzenbach <kurt@linutronix.de>2022-04-14 11:18:03 +0200
committerThomas Gleixner <tglx@linutronix.de>2022-04-14 16:19:30 +0200
commit3dc6ffae2da201284cb24af66af77ee0bbb2efaa (patch)
treeed4df2100062a31a189bebab0673d1d1c90b6818
parentce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e (diff)
timekeeping: Introduce fast accessor to clock tai
Introduce fast/NMI safe accessor to clock tai for tracing. The Linux kernel tracing infrastructure has support for using different clocks to generate timestamps for trace events. Especially in TSN networks it's useful to have TAI as trace clock, because the application scheduling is done in accordance to the network time, which is based on TAI. With a tai trace_clock in place, it becomes very convenient to correlate network activity with Linux kernel application traces. Use the same implementation as ktime_get_boot_fast_ns() does by reading the monotonic time and adding the TAI offset. The same limitations as for the fast boot implementation apply. The TAI offset may change at run time e.g., by setting the time or using adjtimex() with an offset. However, these kind of offset changes are rare events. Nevertheless, the user has to be aware and deal with it in post processing. An alternative approach would be to use the same implementation as ktime_get_real_fast_ns() does. However, this requires to add an additional u64 member to the tk_read_base struct. This struct together with a seqcount is designed to fit into a single cache line on 64 bit architectures. Adding a new member would violate this constraint. Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: https://lore.kernel.org/r/20220414091805.89667-2-kurt@linutronix.de
-rw-r--r--Documentation/core-api/timekeeping.rst1
-rw-r--r--include/linux/timekeeping.h1
-rw-r--r--kernel/time/timekeeping.c17
3 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/core-api/timekeeping.rst b/Documentation/core-api/timekeeping.rst
index 729e24864fe7..22ec68f24421 100644
--- a/Documentation/core-api/timekeeping.rst
+++ b/Documentation/core-api/timekeeping.rst
@@ -132,6 +132,7 @@ Some additional variants exist for more specialized cases:
.. c:function:: u64 ktime_get_mono_fast_ns( void )
u64 ktime_get_raw_fast_ns( void )
u64 ktime_get_boot_fast_ns( void )
+ u64 ktime_get_tai_fast_ns( void )
u64 ktime_get_real_fast_ns( void )
These variants are safe to call from any context, including from
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 78a98bdff76d..fe1e467ba046 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -177,6 +177,7 @@ static inline u64 ktime_get_raw_ns(void)
extern u64 ktime_get_mono_fast_ns(void);
extern u64 ktime_get_raw_fast_ns(void);
extern u64 ktime_get_boot_fast_ns(void);
+extern u64 ktime_get_tai_fast_ns(void);
extern u64 ktime_get_real_fast_ns(void);
/*
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index dcdcb85121e4..2c22023fbf5f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -532,6 +532,23 @@ u64 notrace ktime_get_boot_fast_ns(void)
}
EXPORT_SYMBOL_GPL(ktime_get_boot_fast_ns);
+/**
+ * ktime_get_tai_fast_ns - NMI safe and fast access to tai clock.
+ *
+ * The same limitations as described for ktime_get_boot_fast_ns() apply. The
+ * mono time and the TAI offset are not read atomically which may yield wrong
+ * readouts. However, an update of the TAI offset is an rare event e.g., caused
+ * by settime or adjtimex with an offset. The user of this function has to deal
+ * with the possibility of wrong timestamps in post processing.
+ */
+u64 notrace ktime_get_tai_fast_ns(void)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+
+ return (ktime_get_mono_fast_ns() + ktime_to_ns(data_race(tk->offs_tai)));
+}
+EXPORT_SYMBOL_GPL(ktime_get_tai_fast_ns);
+
static __always_inline u64 __ktime_get_real_fast(struct tk_fast *tkf, u64 *mono)
{
struct tk_read_base *tkr;