linux-kernel - [tip:perf/timer] time: Introduce tk_fast

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Message-ID: <tip-f09cb9a1808e35ad7502ea39b6bfb443c7fa0f19@git.kernel.org>
Date:	Fri, 27 Mar 2015 04:45:32 -0700
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	john.stultz@...aro.org, tglx@...utronix.de
Subject: [tip:perf/timer] time: Introduce tk_fast_raw

Commit-ID:  f09cb9a1808e35ad7502ea39b6bfb443c7fa0f19
Gitweb:     http://git.kernel.org/tip/f09cb9a1808e35ad7502ea39b6bfb443c7fa0f19
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 19 Mar 2015 09:39:08 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Mar 2015 09:45:09 +0100

time: Introduce tk_fast_raw

Add the NMI safe CLOCK_MONOTONIC_RAW accessor..

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: John Stultz <john.stultz@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20150319093400.562746929@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/timekeeping.h |  1 +
 kernel/time/timekeeping.c   | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 3eaae47..f36b1ed 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -220,6 +220,7 @@ static inline u64 ktime_get_raw_ns(void)
 }
 
 extern u64 ktime_get_mono_fast_ns(void);
+extern u64 ktime_get_raw_fast_ns(void);
 
 /*
  * Timespec interfaces utilizing the ktime based ones
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 278373e..c3fcff0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -59,6 +59,7 @@ struct tk_fast {
 };
 
 static struct tk_fast tk_fast_mono ____cacheline_aligned;
+static struct tk_fast tk_fast_raw  ____cacheline_aligned;
 
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
@@ -434,6 +435,12 @@ u64 ktime_get_mono_fast_ns(void)
 }
 EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns);
 
+u64 ktime_get_raw_fast_ns(void)
+{
+	return __ktime_get_fast_ns(&tk_fast_raw);
+}
+EXPORT_SYMBOL_GPL(ktime_get_raw_fast_ns);
+
 /* Suspend-time cycles value for halted fast timekeeper. */
 static cycle_t cycles_at_suspend;
 
@@ -461,6 +468,11 @@ static void halt_fast_timekeeper(struct timekeeper *tk)
 	cycles_at_suspend = tkr->read(tkr->clock);
 	tkr_dummy.read = dummy_clock_read;
 	update_fast_timekeeper(&tkr_dummy, &tk_fast_mono);
+
+	tkr = &tk->tkr_raw;
+	memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy));
+	tkr_dummy.read = dummy_clock_read;
+	update_fast_timekeeper(&tkr_dummy, &tk_fast_raw);
 }
 
 #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD
@@ -592,6 +604,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
 		       sizeof(tk_core.timekeeper));
 
 	update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
+	update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
 }
 
 /**
--
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