Recent changes (master)

[Jens Axboe <axboe@kernel.dk>]

The following changes since commit 9af4af7ab40c4e505033d0e077cc42ac84996b09:

  ci: fix macOS sphinx install issues (2024-02-22 20:01:27 -0500)

are available in the Git repository at:

  git://git.kernel.dk/fio.git master

for you to fetch changes up to 5ae4f4220a48dddddc84c8b839ef9d8a1ed4edb1:

  gettime: fix cpuclock-test on AMD platforms (2024-02-27 12:36:45 -0500)

----------------------------------------------------------------
Vincent Fu (2):
      howto: fix job_start_clock_id formatting
      gettime: fix cpuclock-test on AMD platforms

 HOWTO.rst          | 5 +++--
 arch/arch-x86_64.h | 5 +++++
 arch/arch.h        | 7 +++++++
 gettime.c          | 2 +-
 4 files changed, 16 insertions(+), 3 deletions(-)

---

Diff of recent changes:

diff --git a/HOWTO.rst b/HOWTO.rst
index 4b02100c..169cdc2a 100644
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -756,8 +756,9 @@ Time related parameters
 	CPU mask of other jobs.
 
 .. option:: job_start_clock_id=int
-   The clock_id passed to the call to `clock_gettime` used to record job_start
-   in the `json` output format. Default is 0, or CLOCK_REALTIME.
+
+        The clock_id passed to the call to `clock_gettime` used to record
+        job_start in the `json` output format. Default is 0, or CLOCK_REALTIME.
 
 
 Target file/device
diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 86ce1b7e..b402dc6d 100644
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -26,6 +26,11 @@ static inline unsigned long arch_ffz(unsigned long bitmask)
 	return bitmask;
 }
 
+static inline void tsc_barrier(void)
+{
+	__asm__ __volatile__("mfence":::"memory");
+}
+
 static inline unsigned long long get_cpu_clock(void)
 {
 	unsigned int lo, hi;
diff --git a/arch/arch.h b/arch/arch.h
index 3ee9b053..7e294ddf 100644
--- a/arch/arch.h
+++ b/arch/arch.h
@@ -108,6 +108,13 @@ extern unsigned long arch_flags;
 #include "arch-generic.h"
 #endif
 
+#if !defined(__x86_64__) && defined(CONFIG_SYNC_SYNC)
+static inline void tsc_barrier(void)
+{
+	__sync_synchronize();
+}
+#endif
+
 #include "../lib/ffz.h"
 /* IWYU pragma: end_exports */
 
diff --git a/gettime.c b/gettime.c
index bc66a3ac..5ca31206 100644
--- a/gettime.c
+++ b/gettime.c
@@ -623,7 +623,7 @@ static void *clock_thread_fn(void *data)
 			seq = *t->seq;
 			if (seq == UINT_MAX)
 				break;
-			__sync_synchronize();
+			tsc_barrier();
 			tsc = get_cpu_clock();
 		} while (seq != atomic32_compare_and_swap(t->seq, seq, seq + 1));