diff mbox series

[4/6] tick/nohz: Move nohz_full related fields out of hot task struct's places

Message ID 20250410152327.24504-5-frederic@kernel.org (mailing list archive)
State New
Headers show
Series sched/mm: LRU drain flush on nohz_full | expand

Commit Message

Frederic Weisbecker April 10, 2025, 3:23 p.m. UTC 
nohz_full is a feature that only fits into rare and very corner cases.
Yet distros enable it by default and therefore the related fields are
always reserved in the task struct.

Those task fields are stored in the middle of cacheline hot places such
as cputime accounting and context switch counting, which doesn't make
any sense for a feature that is disabled most of the time.

Move the nohz_full storage to colder places.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
 include/linux/sched.h | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f96ac1982893..b5ce76db6d75 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1110,13 +1110,7 @@  struct task_struct {
 #endif
 	u64				gtime;
 	struct prev_cputime		prev_cputime;
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-	struct vtime			vtime;
-#endif
 
-#ifdef CONFIG_NO_HZ_FULL
-	atomic_t			tick_dep_mask;
-#endif
 	/* Context switch counts: */
 	unsigned long			nvcsw;
 	unsigned long			nivcsw;
@@ -1438,6 +1432,14 @@  struct task_struct {
 	struct task_delay_info		*delays;
 #endif
 
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
+	struct vtime			vtime;
+#endif
+
+#ifdef CONFIG_NO_HZ_FULL
+	atomic_t			tick_dep_mask;
+#endif
+
 #ifdef CONFIG_FAULT_INJECTION
 	int				make_it_fail;
 	unsigned int			fail_nth;