From c7b858ff8d2e8b2d785f74b2d319bc9c839f4faa Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Mon, 14 Dec 2020 18:49:23 +0100 Subject: libbb: add and use infrastructure for fixed page size optimization 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 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 0/6 up/down: 0/-106) Total: -106 bytes Signed-off-by: Denys Vlasenko --- include/libbb.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include') diff --git a/include/libbb.h b/include/libbb.h index a74b3119f..db5bf7a51 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -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; -- cgit v1.2.3