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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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14
miscutils/hexedit.c
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@ -31,7 +31,8 @@ struct globals {
int fd;
unsigned height;
unsigned row;
unsigned pagesize;
IF_VARIABLE_ARCH_PAGESIZE(unsigned pagesize;)
#define G_pagesize cached_pagesize(G.pagesize)
uint8_t *baseaddr;
uint8_t *current_byte;
uint8_t *eof_byte;
@ -46,15 +47,6 @@ struct globals {
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
} while (0)
//TODO: move to libbb
#if defined(__x86_64__) || defined(i386)
# define G_pagesize 4096
# define INIT_PAGESIZE() ((void)0)
#else
# define G_pagesize (G.pagesize)
# define INIT_PAGESIZE() ((void)(G.pagesize = getpagesize()))
#endif
/* hopefully there aren't arches with PAGE_SIZE > 64k */
#define G_mapsize (64*1024)
@ -262,7 +254,7 @@ int hexedit_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hexedit_main(int argc UNUSED_PARAM, char **argv)
{
INIT_G();
INIT_PAGESIZE();
INIT_PAGESIZE(G.pagesize);
get_terminal_width_height(-1, NULL, &G.height);
if (1) {