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scoutfs: add shrink exit trace points

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Add trace points that show the incoming nr_to_scan and resulting object
count for shrinker calls.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-09-28 13:59:49 -07:00
committed by Mark Fasheh
parent 43a2d63f79
commit 15aa09b0c2
4 changed files with 44 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kmod/src/item.c
+4 -1
View File
@@ -1748,6 +1748,7 @@ static int item_lru_shrink(struct shrinker *shrink, struct shrink_control *sc)
struct cached_item *end;
unsigned long flags;
unsigned long nr;
int ret;
nr = sc->nr_to_scan;
if (nr == 0)
@@ -1848,7 +1849,9 @@ abort:
spin_unlock_irqrestore(&cac->lock, flags);
out:
return min_t(unsigned long, cac->lru_nr, INT_MAX);
ret = min_t(unsigned long, cac->lru_nr, INT_MAX);
trace_scoutfs_item_shrink_exit(sb, sc->nr_to_scan, ret);
return ret;
}
static void *copy_key_with_len(void *data, struct scoutfs_key_buf *key)
kmod/src/lock.c
+4 -1
View File
@@ -345,6 +345,7 @@ static int shrink_lock_tree(struct shrinker *shrink, struct shrink_control *sc)
struct scoutfs_lock *tmp;
unsigned long flags;
unsigned long nr;
int ret;
nr = sc->nr_to_scan;
if (!nr)
@@ -368,7 +369,9 @@ static int shrink_lock_tree(struct shrinker *shrink, struct shrink_control *sc)
spin_unlock_irqrestore(&linfo->lock, flags);
out:
return min_t(unsigned long, linfo->lru_nr, INT_MAX);
ret = min_t(unsigned long, linfo->lru_nr, INT_MAX);
trace_scoutfs_lock_shrink_exit(linfo->sb, sc->nr_to_scan, ret);
return ret;
}
static void free_lock_tree(struct super_block *sb)
kmod/src/scoutfs_trace.h
+32
View File
@@ -1650,6 +1650,38 @@ TRACE_EVENT(scoutfs_item_next_range_check,
__get_str(last), __get_str(end), __get_str(range_end))
);
DECLARE_EVENT_CLASS(scoutfs_shrink_exit_class,
TP_PROTO(struct super_block *sb, unsigned long nr_to_scan, int ret),
TP_ARGS(sb, nr_to_scan, ret),
TP_STRUCT__entry(
__field(void *, sb)
__field(unsigned long, nr_to_scan)
__field(int, ret)
),
TP_fast_assign(
__entry->sb = sb;
__entry->nr_to_scan = nr_to_scan;
__entry->ret = ret;
),
TP_printk("sb %p nr_to_scan %lu ret %d",
__entry->sb, __entry->nr_to_scan, __entry->ret)
);
DEFINE_EVENT(scoutfs_shrink_exit_class, scoutfs_lock_shrink_exit,
TP_PROTO(struct super_block *sb, unsigned long nr_to_scan, int ret),
TP_ARGS(sb, nr_to_scan, ret)
);
DEFINE_EVENT(scoutfs_shrink_exit_class, scoutfs_seg_shrink_exit,
TP_PROTO(struct super_block *sb, unsigned long nr_to_scan, int ret),
TP_ARGS(sb, nr_to_scan, ret)
);
DEFINE_EVENT(scoutfs_shrink_exit_class, scoutfs_item_shrink_exit,
TP_PROTO(struct super_block *sb, unsigned long nr_to_scan, int ret),
TP_ARGS(sb, nr_to_scan, ret)
);
#endif /* _TRACE_SCOUTFS_H */
/* This part must be outside protection */
kmod/src/seg.c
+4 -1
View File
@@ -716,6 +716,7 @@ static int seg_lru_shrink(struct shrinker *shrink, struct shrink_control *sc)
unsigned long flags;
unsigned long nr;
LIST_HEAD(list);
int ret;
nr = sc->nr_to_scan;
if (!nr)
@@ -746,7 +747,9 @@ static int seg_lru_shrink(struct shrinker *shrink, struct shrink_control *sc)
}
out:
return min_t(unsigned long, cac->lru_nr, INT_MAX);
ret = min_t(unsigned long, cac->lru_nr, INT_MAX);
trace_scoutfs_seg_shrink_exit(sb, sc->nr_to_scan, ret);
return ret;
}
int scoutfs_seg_setup(struct super_block *sb)