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

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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, ...)
{