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authorJaegeuk Kim <jaegeuk@kernel.org>2015-01-08 01:09:48 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2015-01-10 04:02:28 +0300
commit351f4fba843db3303a92897b21a3d4dff4b6c717 (patch)
treec7f729d8f998e10a861a3e4bbf2aa200df012309 /fs/f2fs/trace.c
parentc05086506f2204bcf02c9d3eb7950cdf0d8a3bef (diff)
downloadlinux-351f4fba843db3303a92897b21a3d4dff4b6c717.tar.xz
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>
Diffstat (limited to 'fs/f2fs/trace.c')
-rw-r--r--fs/f2fs/trace.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c
index 92fa38a47e63..b3570dcca945 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);
+}