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f2fs: add f2fs_destroy_trace_ios to free radix tree

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This patch removes radix tree after finishing tracing IOs.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-01-07 14:09:48 -08:00
parent c05086506f
commit 351f4fba84
3 changed files with 40 additions and 0 deletions
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1
fs/f2fs/super.c
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@ -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)

37
fs/f2fs/trace.c
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@ -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);
}

2
fs/f2fs/trace.h
View File

@ -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__ */