These flags are the ones tweaked through sysfs, they control the
behavior of autonuma, from enabling disabling it, to selecting various
runtime options.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
include/linux/autonuma_flags.h | 120 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 120 insertions(+), 0 deletions(-)
create mode 100644 include/linux/autonuma_flags.h
diff --git a/include/linux/autonuma_flags.h b/include/linux/autonuma_flags.h
new file mode 100644
index 0000000..630ecc5
--- /dev/null
+++ b/include/linux/autonuma_flags.h
@@ -0,0 +1,120 @@
+#ifndef _LINUX_AUTONUMA_FLAGS_H
+#define _LINUX_AUTONUMA_FLAGS_H
+
+/*
+ * If CONFIG_AUTONUMA=n only autonuma_possible() is defined (as false)
+ * to allow optimizing away at compile time blocks of common code
+ * without using #ifdefs.
+ */
+
+#ifdef CONFIG_AUTONUMA
+
+enum autonuma_flag {
+ /*
+ * Set if the kernel wasn't passed the "noautonuma" boot
+ * parameter and the hardware is NUMA. If AutoNUMA is not
+ * possible the value of all other flags becomes irrelevant
+ * (they will never be checked) and AutoNUMA can't be enabled.
+ *
+ * No defaults: depends on hardware discovery and "noautonuma"
+ * early param.
+ */
+ AUTONUMA_POSSIBLE_FLAG,
+ /*
+ * If AutoNUMA is possible, this defines if AutoNUMA is
+ * currently enabled or disabled. It can be toggled at runtime
+ * through sysfs.
+ *
+ * The default depends on CONFIG_AUTONUMA_DEFAULT_ENABLED.
+ */
+ AUTONUMA_ENABLED_FLAG,
+ /*
+ * If set through sysfs this will print lots of debug info
+ * about the AutoNUMA activities in the kernel logs.
+ *
+ * Default not set.
+ */
+ AUTONUMA_DEBUG_FLAG,
+ /*
+ * This defines if CFS should prioritize between load
+ * balancing fairness or NUMA affinity, if there are no idle
+ * CPUs available. If this flag is set AutoNUMA will
+ * prioritize on NUMA affinity and it will disregard
+ * inter-node fairness.
+ *
+ * Default not set.
+ */
+ AUTONUMA_SCHED_LOAD_BALANCE_STRICT_FLAG,
+ /*
+ * This flag defines if the task/mm_autonuma statistics should
+ * be inherited from the parent task/process or instead if
+ * they should be cleared at every fork/clone. The
+ * task/mm_autonuma statistics are always cleared across
+ * execve and there's no way to disable that.
+ *
+ * Default not set.
+ */
+ AUTONUMA_CHILD_INHERITANCE_FLAG,
+ /*
+ * If set, this tells knuma_scand to trigger NUMA hinting page
+ * faults at the pmd level instead of the pte level. This
+ * reduces the number of NUMA hinting faults potentially
+ * saving CPU time. It reduces the accuracy of the
+ * task_autonuma statistics (but does not change the accuracy
+ * of the mm_autonuma statistics). This flag can be toggled
+ * through sysfs as runtime.
+ *
+ * This flag does not affect AutoNUMA with transparent
+ * hugepages (THP). With THP the NUMA hinting page faults
+ * always happen at the pmd level, regardless of the setting
+ * of this flag. Note: there is no reduction in accuracy of
+ * task_autonuma statistics with THP.
+ *
+ * Default set.
+ */
+ AUTONUMA_SCAN_PMD_FLAG,
+};
+
+extern unsigned long autonuma_flags;
+
+static inline bool autonuma_possible(void)
+{
+ return test_bit(AUTONUMA_POSSIBLE_FLAG, &autonuma_flags);
+}
+
+static inline bool autonuma_enabled(void)
+{
+ return test_bit(AUTONUMA_ENABLED_FLAG, &autonuma_flags);
+}
+
+static inline bool autonuma_debug(void)
+{
+ return test_bit(AUTONUMA_DEBUG_FLAG, &autonuma_flags);
+}
+
+static inline bool autonuma_sched_load_balance_strict(void)
+{
+ return test_bit(AUTONUMA_SCHED_LOAD_BALANCE_STRICT_FLAG,
+ &autonuma_flags);
+}
+
+static inline bool autonuma_child_inheritance(void)
+{
+ return test_bit(AUTONUMA_CHILD_INHERITANCE_FLAG, &autonuma_flags);
+}
+
+static inline bool autonuma_scan_pmd(void)
+{
+ return test_bit(AUTONUMA_SCAN_PMD_FLAG, &autonuma_flags);
+}
+
+#else /* CONFIG_AUTONUMA */
+
+static inline bool autonuma_possible(void)
+{
+ return false;
+}
+
+#endif /* CONFIG_AUTONUMA */
+
+#endif /* _LINUX_AUTONUMA_FLAGS_H */
--
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