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btrfs: add 'cold' compiler annotations to all error handling functions 

The annotated functios will be placed into .text.unlikely section. The
annotation also hints compiler to move the code out of the hot paths,
and may implicitly mark if-statement leading to that block as unlikely.

This is a heuristic, the impact on the generated code is not
significant.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2015-04-24 19:11:57 +02:00 committed by Chris Mason
parent 1a9a8a71ed
commit c0d19e2b9a
2 changed files with 7 additions and 0 deletions
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4
fs/btrfs/ctree.h
View File

@ -4050,6 +4050,7 @@ void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
#ifdef CONFIG_BTRFS_ASSERT
__cold
static inline void assfail(char *expr, char *file, int line)
{
pr_err("BTRFS: assertion failed: %s, file: %s, line: %d",
@ -4065,10 +4066,12 @@ static inline void assfail(char *expr, char *file, int line)
#define btrfs_assert()
__printf(5, 6)
__cold
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...);
__cold
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *function,
unsigned int line, int errno);
@ -4138,6 +4141,7 @@ do { \
} while (0)
__printf(5, 6)
__cold
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...);

3
fs/btrfs/super.c
View File

@ -135,6 +135,7 @@ static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
* __btrfs_std_error decodes expected errors from the caller and
* invokes the approciate error response.
*/
__cold
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...)
{
@ -247,6 +248,7 @@ void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
* We'll complete the cleanup in btrfs_end_transaction and
* btrfs_commit_transaction.
*/
__cold
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *function,
unsigned int line, int errno)
@ -273,6 +275,7 @@ void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
* __btrfs_panic decodes unexpected, fatal errors from the caller,
* issues an alert, and either panics or BUGs, depending on mount options.
*/
__cold
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
unsigned int line, int errno, const char *fmt, ...)
{