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| author |   Jaegeuk Kim <jaegeuk@kernel.org> | 2015-01-07 14:07:36 -0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-01-09 17:02:28 -0800 |
| commit | c05086506f2204bcf02c9d3eb7950cdf0d8a3bef (patch) | |
| tree | 497cac2c9e686e280d83e499cf4577c634f8eabe /fs/f2fs/trace.c | |
| parent | f2fs: add nat/sit entries into status (diff) | |
| download | linux-dev-c05086506f2204bcf02c9d3eb7950cdf0d8a3bef.tar.xz linux-dev-c05086506f2204bcf02c9d3eb7950cdf0d8a3bef.zip | |
f2fs: add spin_lock to cover radix operations in IO tracer
This patch adds spin_lock to cover radix tree operations in IO tracer.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/trace.c')
| -rw-r--r-- | fs/f2fs/trace.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c index 19f5216b9b9c..92fa38a47e63 100644 --- a/fs/f2fs/trace.c +++ b/fs/f2fs/trace.c @@ -15,7 +15,8 @@ #include "f2fs.h" #include "trace.h" -RADIX_TREE(pids, GFP_NOIO); +RADIX_TREE(pids, GFP_ATOMIC); +spinlock_t pids_lock; struct last_io_info last_io; static inline void __print_last_io(void) @@ -58,9 +59,13 @@ void f2fs_trace_pid(struct page *page) page->private = pid; + if (radix_tree_preload(GFP_NOFS)) + return; + + spin_lock(&pids_lock); p = radix_tree_lookup(&pids, pid); if (p == current) - return; + goto out; if (p) radix_tree_delete(&pids, pid); @@ -69,7 +74,9 @@ void f2fs_trace_pid(struct page *page) trace_printk("%3x:%3x %4x %-16s\n", MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev), pid, current->comm); - +out: + spin_unlock(&pids_lock); + radix_tree_preload_end(); } void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush) @@ -108,3 +115,8 @@ void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush) last_io.len = 1; return; } + +void f2fs_build_trace_ios(void) +{ + spin_lock_init(&pids_lock); +} |