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authorFrederic Weisbecker <[email protected]>2019-10-16 04:56:55 +0200
committerIngo Molnar <[email protected]>2019-10-29 10:01:15 +0100
commit9adbb9dd4c4eb45e1129fc73d8de69ca72350f81 (patch)
tree59ece784f86ef5e8d6709403a764597ba2d27cda
parente44fcb4b7a299602fb300b82a546c0b8a50d9d90 (diff)
sched/vtime: Introduce vtime_accounting_enabled_cpu()
This allows us to check if a remote CPU runs vtime accounting (ie: is nohz_full). We'll need that to reliably support reading kcpustat on nohz_full CPUs. Also simplify a bit the condition in the local flavoured function while at it. Signed-off-by: Frederic Weisbecker <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Jacek Anaszewski <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Pavel Machek <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rafael J . Wysocki <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Viresh Kumar <[email protected]> Cc: Wanpeng Li <[email protected]> Cc: Yauheni Kaliuta <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
-rw-r--r--include/linux/vtime.h13
1 files changed, 7 insertions, 6 deletions
diff --git a/include/linux/vtime.h b/include/linux/vtime.h
index eb2e7a19054b..e2733bf33541 100644
--- a/include/linux/vtime.h
+++ b/include/linux/vtime.h
@@ -31,14 +31,14 @@ static inline bool vtime_accounting_enabled(void)
return context_tracking_enabled();
}
-static inline bool vtime_accounting_enabled_this_cpu(void)
+static inline bool vtime_accounting_enabled_cpu(int cpu)
{
- if (vtime_accounting_enabled()) {
- if (context_tracking_enabled_this_cpu())
- return true;
- }
+ return (vtime_accounting_enabled() && context_tracking_enabled_cpu(cpu));
+}
- return false;
+static inline bool vtime_accounting_enabled_this_cpu(void)
+{
+ return (vtime_accounting_enabled() && context_tracking_enabled_this_cpu());
}
extern void vtime_task_switch_generic(struct task_struct *prev);
@@ -51,6 +51,7 @@ static inline void vtime_task_switch(struct task_struct *prev)
#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
+static inline bool vtime_accounting_enabled_cpu(int cpu) {return false; }
static inline bool vtime_accounting_enabled_this_cpu(void) { return false; }
static inline void vtime_task_switch(struct task_struct *prev) { }