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libbb: add and use infrastructure for fixed page size optimization

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function                                             old     new   delta
procps_scan                                         1121    1118      -3
getpagesize                                            6       -      -6
rpm_main                                            1037    1027     -10
rpm2cpio_main                                        120     110     -10
ptok                                                  38      21     -17
time_main                                           1282    1261     -21
mkswap_main                                          317     278     -39
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(add/remove: 0/2 grow/shrink: 0/6 up/down: 0/-106)           Total: -106 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2020-12-14 18:49:23 +01:00
parent fd3c512f88
commit c7b858ff8d
7 changed files with 37 additions and 20 deletions
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18
include/libbb.h
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@ -391,6 +391,24 @@ void *mmap_read(int fd, size_t size) FAST_FUNC;
void *mmap_anon(size_t size) FAST_FUNC;
void *xmmap_anon(size_t size) FAST_FUNC;
#if defined(__x86_64__) || defined(i386)
# define BB_ARCH_FIXED_PAGESIZE 4096
#else /* if defined(ARCH) */
/* add you favorite arch today! */
#endif
#if defined BB_ARCH_FIXED_PAGESIZE
# define IF_VARIABLE_ARCH_PAGESIZE(...) /*nothing*/
# define bb_getpagesize() BB_ARCH_FIXED_PAGESIZE
# define INIT_PAGESIZE(var) ((void)0)
# define cached_pagesize(var) BB_ARCH_FIXED_PAGESIZE
#else
# define IF_VARIABLE_ARCH_PAGESIZE(...) __VA_ARGS__
# define bb_getpagesize() getpagesize()
# define INIT_PAGESIZE(var) ((var) = getpagesize())
# define cached_pagesize(var) (var)
#endif
//TODO: supply a pointer to char[11] buffer (avoid statics)?
extern const char *bb_mode_string(mode_t mode) FAST_FUNC;