linux/0126-print-fsync-count-for-bootchart.patch at master · Mikedkmilk/linux · GitHub

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From 41e1c7869bca6e84545e265460e73b33b2e449f9 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Tue, 20 Jun 2017 20:19:08 +0000
Subject: [PATCH 126/126] print fsync count for bootchart

---
 block/blk-core.c      | 3 +++
 include/linux/sched.h | 1 +
 kernel/sched/debug.c  | 1 +
 3 files changed, 5 insertions(+)

diff --git a/block/blk-core.c b/block/blk-core.c
index 048be4aa6024..3ddfe5901a07 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2271,6 +2271,9 @@ blk_qc_t submit_bio(struct bio *bio)
 			count_vm_events(PGPGIN, count);
 		}

+		if (bio->bi_opf & REQ_PREFLUSH)
+			current->fsync_count++;
+
 		if (unlikely(block_dump)) {
 			char b[BDEVNAME_SIZE];
 			printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors)\n",
diff --git a/include/linux/sched.h b/include/linux/sched.h
index fdf74f27acf1..f4a102b249f5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -738,6 +738,7 @@ struct task_struct {
 	struct task_cputime		cputime_expires;
 	struct list_head		cpu_timers[3];
 #endif
+	int fsync_count;

 	/* Process credentials: */

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 2f93e4a2d9f6..7a2f3f3ea75b 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -943,6 +943,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 	PN(se.exec_start);
 	PN(se.vruntime);
 	PN(se.sum_exec_runtime);
+	P(fsync_count);

 	nr_switches = p->nvcsw + p->nivcsw;

--
2.15.0