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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-08-21 14:46:05 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-10-19 10:45:25 -0700 |
| commit | 6f6e3ee567cbff328df83dcf9ee0a5459746fce0 (patch) | |
| tree | a61f9d12d5b24e37ac8d4e39c9585e37e0e4f900 /sysdeps/unix/sysv/linux/statfs64.c | |
| parent | 2028f49dabb94bd56a85a7be16141bee4853aae6 (diff) | |
| download | glibc-hjl/i386/master.zip glibc-hjl/i386/master.tar.gz glibc-hjl/i386/master.tar.bz2 | |
Avoid reading errno in syscall implementationshjl/i386/master
Reading errno is expensive for x86 PIC. With INTERNAL_SYSCALL,
INTERNAL_SYSCALL_ERROR_P, INTERNAL_SYSCALL_ERRNO and
INLINE_SYSCALL_ERROR_RETURN_VALUE, we can avoid reading errno.
There are no code changes on x86-64. On i686, libc.so sizes in bytes
show:
text data bss dec
after 1748495 11380 11132 1771007
before 1748403 11380 11132 1770915
* sysdeps/unix/sysv/linux/eventfd.c (eventfd): Use
INTERNAL_SYSCALL, INTERNAL_SYSCALL_ERROR_P and
INTERNAL_SYSCALL_ERRNO to avoid reading errno.
* sysdeps/unix/sysv/linux/fstatfs64.c (__fstatfs64): Likewise.
* sysdeps/unix/sysv/linux/getrlimit64.c (__getrlimit64):
Likewise.
* sysdeps/unix/sysv/linux/setrlimit64.c (setrlimit64):
Likewise.
* sysdeps/unix/sysv/linux/signalfd.c (signalfd): Likewise.
* sysdeps/unix/sysv/linux/statfs64.c (__statfs64): Likewise.
Diffstat (limited to 'sysdeps/unix/sysv/linux/statfs64.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/statfs64.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/statfs64.c b/sysdeps/unix/sysv/linux/statfs64.c index ac5c33f..469eda1 100644 --- a/sysdeps/unix/sysv/linux/statfs64.c +++ b/sysdeps/unix/sysv/linux/statfs64.c @@ -37,12 +37,18 @@ __statfs64 (const char *file, struct statfs64 *buf) if (! __no_statfs64) # endif { - int result = INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf); - # if __ASSUME_STATFS64 == 0 - if (result == 0 || errno != ENOSYS) -# endif + INTERNAL_SYSCALL_DECL (err); + int result = INTERNAL_SYSCALL (statfs64, err, 3, file, + sizeof (*buf), buf); + + if (!__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err))) return result; + else if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) + return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result, err)); +# else + return INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf); +# endif # if __ASSUME_STATFS64 == 0 __no_statfs64 = 1; |