f2fs: Demote GC thread to idle scheduler class

We don't want the background GC work causing UI jitter should it ever collide with periods of user activity. Signed-off-by: Danny Lin <[email protected]>
kdrag0n · Dec 4, 2020 · 2e575be · 2e575be
1 parent 5e4d6c5
commit 2e575be
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
@@ -14,6 +14,7 @@
 #include <linux/delay.h>
 #include <linux/freezer.h>
 #include <linux/sched/signal.h>
+#include <uapi/linux/sched/types.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -124,6 +125,7 @@ static int gc_thread_func(void *data)
 
 int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
 {
+	const struct sched_param param = { .sched_priority = 0 };
 	struct f2fs_gc_kthread *gc_th;
 	dev_t dev = sbi->sb->s_bdev->bd_dev;
 	int err = 0;
@@ -150,6 +152,7 @@ int f2fs_start_gc_thread(struct f2fs_sb_info *sbi)
 		kvfree(gc_th);
 		sbi->gc_thread = NULL;
 	}
+	sched_setscheduler(sbi->gc_thread->f2fs_gc_task, SCHED_IDLE, &param);
 	set_task_ioprio(sbi->gc_thread->f2fs_gc_task,
 			IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
 out: