[PATCH 2/2] f2fs: add sysfs support for controlling the gc_thread
From: Namjae Jeon
Date: Sat May 25 2013 - 22:06:16 EST
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Add sysfs entries to control the timing parameters for
f2fs gc thread and also provide a control flag, which will
allow the user to forcefully start a FG garbage collection
if required.
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Pankaj Kumar <pankaj.km@xxxxxxxxxxx>
---
fs/f2fs/f2fs.h | 6 +++
fs/f2fs/gc.c | 20 +++++---
fs/f2fs/gc.h | 33 +++++++------
fs/f2fs/super.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 185 insertions(+), 21 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 00c8c5f..40abd81 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -400,6 +400,8 @@ struct f2fs_sb_info {
struct mutex gc_mutex; /* mutex for GC */
struct f2fs_gc_kthread *gc_thread; /* GC thread */
unsigned int cur_victim_sec; /* current victim section num */
+ unsigned int forced_fg; /* forced forgound gc */
+
/*
* for stat information.
@@ -415,6 +417,10 @@ struct f2fs_sb_info {
#endif
unsigned int last_victim[2]; /* last victim segment # */
spinlock_t stat_lock; /* lock for stat operations */
+
+ /* For sysfs suppport */
+ struct kobject s_kobj;
+ struct completion s_kobj_unregister;
};
/*
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index ddc2c67..8041d70 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -29,10 +29,11 @@ static struct kmem_cache *winode_slab;
static int gc_thread_func(void *data)
{
struct f2fs_sb_info *sbi = data;
+ struct f2fs_gc_kthread *gc_th = sbi->gc_thread;
wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
long wait_ms;
- wait_ms = GC_THREAD_MIN_SLEEP_TIME;
+ wait_ms = gc_th->min_sleep_time;
do {
if (try_to_freeze())
@@ -45,7 +46,7 @@ static int gc_thread_func(void *data)
break;
if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
- wait_ms = GC_THREAD_MAX_SLEEP_TIME;
+ wait_ms = gc_th->max_sleep_time;
continue;
}
@@ -66,15 +67,15 @@ static int gc_thread_func(void *data)
continue;
if (!is_idle(sbi)) {
- wait_ms = increase_sleep_time(wait_ms);
+ wait_ms = increase_sleep_time(gc_th, wait_ms);
mutex_unlock(&sbi->gc_mutex);
continue;
}
if (has_enough_invalid_blocks(sbi))
- wait_ms = decrease_sleep_time(wait_ms);
+ wait_ms = decrease_sleep_time(gc_th, wait_ms);
else
- wait_ms = increase_sleep_time(wait_ms);
+ wait_ms = increase_sleep_time(gc_th, wait_ms);
#ifdef CONFIG_F2FS_STAT_FS
sbi->bg_gc++;
@@ -82,7 +83,7 @@ static int gc_thread_func(void *data)
/* if return value is not zero, no victim was selected */
if (f2fs_gc(sbi))
- wait_ms = GC_THREAD_NOGC_SLEEP_TIME;
+ wait_ms = gc_th->no_gc_sleep_time;
} while (!kthread_should_stop());
return 0;
}
@@ -101,7 +102,12 @@ int start_gc_thread(struct f2fs_sb_info *sbi)
goto out;
}
+ gc_th->min_sleep_time = DEF_GC_THREAD_MIN_SLEEP_TIME;
+ gc_th->max_sleep_time = DEF_GC_THREAD_MAX_SLEEP_TIME;
+ gc_th->no_gc_sleep_time = DEF_GC_THREAD_NOGC_SLEEP_TIME;
+
sbi->gc_thread = gc_th;
+
init_waitqueue_head(&sbi->gc_thread->gc_wait_queue_head);
sbi->gc_thread->f2fs_gc_task = kthread_run(gc_thread_func, sbi,
"f2fs_gc-%u:%u", MAJOR(dev), MINOR(dev));
@@ -677,7 +683,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi)
{
struct list_head ilist;
unsigned int segno, i;
- int gc_type = BG_GC;
+ int gc_type = sbi->forced_fg ? FG_GC : BG_GC;
int nfree = 0;
int ret = -1;
diff --git a/fs/f2fs/gc.h b/fs/f2fs/gc.h
index 2c6a6bd..f4bf44c 100644
--- a/fs/f2fs/gc.h
+++ b/fs/f2fs/gc.h
@@ -13,9 +13,9 @@
* whether IO subsystem is idle
* or not
*/
-#define GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
-#define GC_THREAD_MAX_SLEEP_TIME 60000
-#define GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
+#define DEF_GC_THREAD_MIN_SLEEP_TIME 30000 /* milliseconds */
+#define DEF_GC_THREAD_MAX_SLEEP_TIME 60000
+#define DEF_GC_THREAD_NOGC_SLEEP_TIME 300000 /* wait 5 min */
#define LIMIT_INVALID_BLOCK 40 /* percentage over total user space */
#define LIMIT_FREE_BLOCK 40 /* percentage over invalid + free space */
@@ -25,6 +25,11 @@
struct f2fs_gc_kthread {
struct task_struct *f2fs_gc_task;
wait_queue_head_t gc_wait_queue_head;
+
+ /* for gc sleep time */
+ unsigned int min_sleep_time;
+ unsigned int max_sleep_time;
+ unsigned int no_gc_sleep_time;
};
struct inode_entry {
@@ -56,25 +61,25 @@ static inline block_t limit_free_user_blocks(struct f2fs_sb_info *sbi)
return (long)(reclaimable_user_blocks * LIMIT_FREE_BLOCK) / 100;
}
-static inline long increase_sleep_time(long wait)
+static inline long increase_sleep_time(struct f2fs_gc_kthread *gc_th, long wait)
{
- if (wait == GC_THREAD_NOGC_SLEEP_TIME)
+ if (wait == gc_th->no_gc_sleep_time)
return wait;
- wait += GC_THREAD_MIN_SLEEP_TIME;
- if (wait > GC_THREAD_MAX_SLEEP_TIME)
- wait = GC_THREAD_MAX_SLEEP_TIME;
+ wait += gc_th->min_sleep_time;
+ if (wait > gc_th->max_sleep_time)
+ wait = gc_th->max_sleep_time;
return wait;
}
-static inline long decrease_sleep_time(long wait)
+static inline long decrease_sleep_time(struct f2fs_gc_kthread *gc_th, long wait)
{
- if (wait == GC_THREAD_NOGC_SLEEP_TIME)
- wait = GC_THREAD_MAX_SLEEP_TIME;
+ if (wait == gc_th->no_gc_sleep_time)
+ wait = gc_th->max_sleep_time;
- wait -= GC_THREAD_MIN_SLEEP_TIME;
- if (wait <= GC_THREAD_MIN_SLEEP_TIME)
- wait = GC_THREAD_MIN_SLEEP_TIME;
+ wait -= gc_th->min_sleep_time;
+ if (wait <= gc_th->min_sleep_time)
+ wait = gc_th->min_sleep_time;
return wait;
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 3ac305d..ef16d2c 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -22,16 +22,20 @@
#include <linux/exportfs.h>
#include <linux/blkdev.h>
#include <linux/f2fs_fs.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
+#include "gc.h"
#define CREATE_TRACE_POINTS
#include <trace/events/f2fs.h>
static struct kmem_cache *f2fs_inode_cachep;
+static struct kset *f2fs_kset;
enum {
Opt_gc_background_off,
@@ -57,6 +61,136 @@ static match_table_t f2fs_tokens = {
{Opt_err, NULL},
};
+/*Sysfs support for F2fs */
+struct f2fs_attr {
+ struct attribute attr;
+ ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
+ ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
+ const char *, size_t);
+ int offset;
+};
+
+static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
+ unsigned int *ui = (unsigned int *) (((char *)gc_kth) + a->offset);
+
+ return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
+static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ struct f2fs_gc_kthread *gc_kth = sbi->gc_thread;
+ unsigned int *ui = (unsigned int *) (((char *)gc_kth) + a->offset);
+ unsigned long t;
+ ssize_t ret;
+
+ ret = kstrtoul(skip_spaces(buf), 0, &t);
+ if (ret < 0)
+ return ret;
+ *ui = t;
+ return count;
+}
+
+static ssize_t f2fs_forced_fg_trigger(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+ ssize_t ret;
+
+ ret = kstrtoul(skip_spaces(buf), 0, &t);
+ if (ret < 0)
+ return ret;
+ if (t == 0)
+ return count;
+ else if (t == 1) {
+ sbi->forced_fg = t;
+ mutex_lock(&sbi->gc_mutex);
+ f2fs_gc(sbi);
+ sbi->forced_fg = 0;
+ }
+
+ return count;
+}
+
+static ssize_t f2fs_forced_fg_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%u\n", sbi->forced_fg);
+}
+
+static ssize_t f2fs_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+ return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+ return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void f2fs_sb_release(struct kobject *kobj)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ complete(&sbi->s_kobj_unregister);
+}
+
+#define F2FS_ATTR_OFFSET(_name, _mode, _show, _store, _elname) \
+static struct f2fs_attr f2fs_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .store = _store, \
+ .offset = offsetof(struct f2fs_gc_kthread, _elname), \
+}
+
+#define F2FS_ATTR(name, mode, show, store) \
+static struct f2fs_attr f2fs_attr_##name = __ATTR(name, mode, show, store)
+
+#define F2FS_RW_ATTR(name, elname) \
+ F2FS_ATTR_OFFSET(name, 0644, f2fs_sbi_show, f2fs_sbi_store, elname)
+
+F2FS_RW_ATTR(gc_min_sleep_time, min_sleep_time);
+F2FS_RW_ATTR(gc_max_sleep_time, max_sleep_time);
+F2FS_RW_ATTR(gc_no_gc_sleep_time, no_gc_sleep_time);
+F2FS_ATTR(gc_forced_fg, 0644, f2fs_forced_fg_show, f2fs_forced_fg_trigger);
+
+#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
+static struct attribute *f2fs_attrs[] = {
+ ATTR_LIST(gc_min_sleep_time),
+ ATTR_LIST(gc_max_sleep_time),
+ ATTR_LIST(gc_no_gc_sleep_time),
+ ATTR_LIST(gc_forced_fg),
+ NULL,
+};
+
+static const struct sysfs_ops f2fs_attr_ops = {
+ .show = f2fs_attr_show,
+ .store = f2fs_attr_store,
+};
+
+static struct kobj_type f2fs_ktype = {
+ .default_attrs = f2fs_attrs,
+ .sysfs_ops = &f2fs_attr_ops,
+ .release = f2fs_sb_release,
+};
+
+
void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
{
struct va_format vaf;
@@ -582,6 +716,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
mutex_init(&sbi->fs_lock[i]);
mutex_init(&sbi->node_write);
sbi->por_doing = 0;
+ sbi->forced_fg = 0;
spin_lock_init(&sbi->stat_lock);
init_rwsem(&sbi->bio_sem);
init_sb_info(sbi);
@@ -691,6 +826,14 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
"the device does not support discard");
}
+ sbi->s_kobj.kset = f2fs_kset;
+ init_completion(&sbi->s_kobj_unregister);
+ err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
+ "%s", sb->s_id);
+ if (err)
+ goto fail;
+
+
return 0;
fail:
stop_gc_thread(sbi);
@@ -765,6 +908,9 @@ static int __init init_f2fs_fs(void)
err = create_checkpoint_caches();
if (err)
goto fail;
+ f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
+ if (!f2fs_kset)
+ goto fail;
err = register_filesystem(&f2fs_fs_type);
if (err)
goto fail;
@@ -781,6 +927,7 @@ static void __exit exit_f2fs_fs(void)
destroy_gc_caches();
destroy_node_manager_caches();
destroy_inodecache();
+ kset_unregister(f2fs_kset);
}
module_init(init_f2fs_fs)
--
1.7.9.5
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