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Subject[PATCH v5 07/14] mm/damon: Implement kernel space API
Date
From: SeongJae Park <sjpark@amazon.de>

This commit implements the DAMON api for the kernel. Other kernel code
can use DAMON by calling damon_start() and damon_stop() with their own
'struct damon_ctx'.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
include/linux/damon.h | 71 +++++++++++++++++++++++++++++++++++++++++++
mm/damon.c | 71 +++++++++----------------------------------
2 files changed, 85 insertions(+), 57 deletions(-)
create mode 100644 include/linux/damon.h

diff --git a/include/linux/damon.h b/include/linux/damon.h
new file mode 100644
index 000000000000..78785cb88d42
--- /dev/null
+++ b/include/linux/damon.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * DAMON api
+ *
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ *
+ * Author: SeongJae Park <sjpark@amazon.de>
+ */
+
+#ifndef _DAMON_H_
+#define _DAMON_H_
+
+#include <linux/random.h>
+#include <linux/spinlock_types.h>
+#include <linux/time64.h>
+#include <linux/types.h>
+
+/* Represents a monitoring target region on the virtual address space */
+struct damon_region {
+ unsigned long vm_start;
+ unsigned long vm_end;
+ unsigned long sampling_addr;
+ unsigned int nr_accesses;
+ struct list_head list;
+};
+
+/* Represents a monitoring target task */
+struct damon_task {
+ unsigned long pid;
+ struct list_head regions_list;
+ struct list_head list;
+};
+
+struct damon_ctx {
+ unsigned long sample_interval;
+ unsigned long aggr_interval;
+ unsigned long regions_update_interval;
+ unsigned long min_nr_regions;
+ unsigned long max_nr_regions;
+
+ struct timespec64 last_aggregation;
+ struct timespec64 last_regions_update;
+
+ unsigned char *rbuf;
+ unsigned int rbuf_len;
+ unsigned int rbuf_offset;
+ char *rfile_path;
+
+ struct task_struct *kdamond;
+ bool kdamond_stop;
+ spinlock_t kdamond_lock;
+
+ struct rnd_state rndseed;
+
+ struct list_head tasks_list; /* 'damon_task' objects */
+
+ /* callbacks */
+ void (*sample_cb)(struct damon_ctx *context);
+ void (*aggregate_cb)(struct damon_ctx *context);
+};
+
+int damon_set_pids(struct damon_ctx *ctx,
+ unsigned long *pids, ssize_t nr_pids);
+int damon_set_recording(struct damon_ctx *ctx,
+ unsigned int rbuf_len, char *rfile_path);
+int damon_set_attrs(struct damon_ctx *ctx, unsigned long s, unsigned long a,
+ unsigned long r, unsigned long min, unsigned long max);
+int damon_start(struct damon_ctx *ctx);
+int damon_stop(struct damon_ctx *ctx);
+
+#endif
diff --git a/mm/damon.c b/mm/damon.c
index 3d46bf5e353a..45d82128e3ac 100644
--- a/mm/damon.c
+++ b/mm/damon.c
@@ -9,6 +9,7 @@

#define pr_fmt(fmt) "damon: " fmt

+#include <linux/damon.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/mm.h>
@@ -40,60 +41,6 @@
#define damon_for_each_task_safe(ctx, t, next) \
list_for_each_entry_safe(t, next, &(ctx)->tasks_list, list)

-/* Represents a monitoring target region on the virtual address space */
-struct damon_region {
- unsigned long vm_start;
- unsigned long vm_end;
- unsigned long sampling_addr;
- unsigned int nr_accesses;
- struct list_head list;
-};
-
-/* Represents a monitoring target task */
-struct damon_task {
- unsigned long pid;
- struct list_head regions_list;
- struct list_head list;
-};
-
-/*
- * For each 'sample_interval', DAMON checks whether each region is accessed or
- * not. It aggregates and keeps the access information (number of accesses to
- * each region) for each 'aggr_interval' time. And for each
- * 'regions_update_interval', damon checks whether the memory mapping of the
- * target tasks has changed (e.g., by mmap() calls from the applications) and
- * applies the changes.
- *
- * All time intervals are in micro-seconds.
- */
-struct damon_ctx {
- unsigned long sample_interval;
- unsigned long aggr_interval;
- unsigned long regions_update_interval;
- unsigned long min_nr_regions;
- unsigned long max_nr_regions;
-
- struct timespec64 last_aggregation;
- struct timespec64 last_regions_update;
-
- unsigned char *rbuf;
- unsigned int rbuf_len;
- unsigned int rbuf_offset;
- char *rfile_path;
-
- struct task_struct *kdamond;
- bool kdamond_stop;
- spinlock_t kdamond_lock;
-
- struct rnd_state rndseed;
-
- struct list_head tasks_list; /* 'damon_task' objects */
-
- /* callbacks */
- void (*sample_cb)(struct damon_ctx *context);
- void (*aggregate_cb)(struct damon_ctx *context);
-};
-
#define MAX_RFILE_PATH_LEN 256

/* Get a random number in [l, r) */
@@ -961,10 +908,20 @@ static int damon_turn_kdamond(struct damon_ctx *ctx, bool on)
return 0;
}

+int damon_start(struct damon_ctx *ctx)
+{
+ return damon_turn_kdamond(ctx, true);
+}
+
+int damon_stop(struct damon_ctx *ctx)
+{
+ return damon_turn_kdamond(ctx, false);
+}
+
/*
* This function should not be called while the kdamond is running.
*/
-static int damon_set_pids(struct damon_ctx *ctx,
+int damon_set_pids(struct damon_ctx *ctx,
unsigned long *pids, ssize_t nr_pids)
{
ssize_t i;
@@ -998,7 +955,7 @@ static int damon_set_pids(struct damon_ctx *ctx,
*
* Returns 0 on success, negative error code otherwise.
*/
-static int damon_set_recording(struct damon_ctx *ctx,
+int damon_set_recording(struct damon_ctx *ctx,
unsigned int rbuf_len, char *rfile_path)
{
size_t rfile_path_len;
@@ -1044,7 +1001,7 @@ static int damon_set_recording(struct damon_ctx *ctx,
*
* Returns 0 on success, negative error code otherwise.
*/
-static int damon_set_attrs(struct damon_ctx *ctx, unsigned long sample_int,
+int damon_set_attrs(struct damon_ctx *ctx, unsigned long sample_int,
unsigned long aggr_int, unsigned long regions_update_int,
unsigned long min_nr_reg, unsigned long max_nr_reg)
{
--
2.17.1
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