Export the throttling statistics collected for each task through
/proc/PID/io-throttle-stat:
- total number of delayed I/O request
- total amount of time in jiffies spent to wait for the delayed requests

Signed-off-by: Andrea Righi
---
fs/proc/base.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 01ed610..9983730 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -54,6 +54,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -2440,6 +2441,14 @@ static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */

+#ifdef CONFIG_CGROUP_IO_THROTTLE
+static int proc_iothrottle_stat(struct task_struct *task, char *buffer)
+{
+ return sprintf(buffer, "%llu %llu\n",
+ get_io_throttle_cnt(task), get_io_throttle_sleep(task));
+}
+#endif /* CONFIG_CGROUP_IO_THROTTLE */
+
/*
* Thread groups
*/
@@ -2515,6 +2524,9 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, tgid_io_accounting),
#endif
+#ifdef CONFIG_CGROUP_IO_THROTTLE
+ INF("io-throttle-stat", S_IRUGO, iothrottle_stat),
+#endif
};

static int proc_tgid_base_readdir(struct file * filp,
@@ -2846,6 +2858,9 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, tid_io_accounting),
#endif
+#ifdef CONFIG_CGROUP_IO_THROTTLE
+ INF("io-throttle-stat", S_IRUGO, iothrottle_stat),
+#endif
};

static int proc_tid_base_readdir(struct file * filp,
--
1.5.4.3

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