f2fs: add f2fs_destroy_trace_ios to free radix tree
This patch removes radix tree after finishing tracing IOs.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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 @@
{
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);
+}