This patch removes radix tree after finishing tracing IOs.
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
fs/f2fs/super.c | 1 +
fs/f2fs/trace.c | 37 +++++++++++++++++++++++++++++++++++++
fs/f2fs/trace.h | 2 ++
3 files changed, 40 insertions(+)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index e6f035c..0e97974 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1272,6 +1272,7 @@ static void __exit exit_f2fs_fs(void)
destroy_node_manager_caches();
destroy_inodecache();
kset_unregister(f2fs_kset);
+ f2fs_destroy_trace_ios();
}
module_init(init_f2fs_fs)
diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c
index 92fa38a..b3570dc 100644
--- a/fs/f2fs/trace.c
+++ b/fs/f2fs/trace.c
@@ -11,6 +11,7 @@
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/sched.h>
+#include <linux/radix-tree.h>
#include "f2fs.h"
#include "trace.h"
@@ -120,3 +121,39 @@ void f2fs_build_trace_ios(void)
{
spin_lock_init(&pids_lock);
}
+
+#define PIDVEC_SIZE 128
+static unsigned int gang_lookup_pids(pid_t *results, unsigned long first_index,
+ unsigned int max_items)
+{
+ struct radix_tree_iter iter;
+ void **slot;
+ unsigned int ret = 0;
+
+ if (unlikely(!max_items))
+ return 0;
+
+ radix_tree_for_each_slot(slot, &pids, &iter, first_index) {
+ results[ret] = iter.index;
+ if (++ret == PIDVEC_SIZE)
+ break;
+ }
+ return ret;
+}
+
+void f2fs_destroy_trace_ios(void)
+{
+ pid_t pid[PIDVEC_SIZE];
+ pid_t next_pid = 0;
+ unsigned int found;
+
+ spin_lock(&pids_lock);
+ while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) {
+ unsigned idx;
+
+ next_pid = pid[found - 1] + 1;
+ for (idx = 0; idx < found; idx++)
+ radix_tree_delete(&pids, pid[idx]);
+ }
+ spin_unlock(&pids_lock);
+}
diff --git a/fs/f2fs/trace.h b/fs/f2fs/trace.h
index eb39fa0..1041dbe 100644
--- a/fs/f2fs/trace.h
+++ b/fs/f2fs/trace.h
@@ -35,10 +35,12 @@ struct last_io_info {
extern void f2fs_trace_pid(struct page *);
extern void f2fs_trace_ios(struct page *, struct f2fs_io_info *, int);
extern void f2fs_build_trace_ios(void);
+extern void f2fs_destroy_trace_ios(void);
#else
#define f2fs_trace_pid(p)
#define f2fs_trace_ios(p, i, n)
#define f2fs_build_trace_ios()
+#define f2fs_destroy_trace_ios()
#endif
#endif /* __F2FS_TRACE_H__ */
--
2.1.1
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