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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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4
libbb/procps.c
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@ -94,15 +94,15 @@ static int read_to_buf(const char *filename, void *buf)
static procps_status_t* FAST_FUNC alloc_procps_scan(void)
{
unsigned n = getpagesize();
procps_status_t* sp = xzalloc(sizeof(procps_status_t));
sp->dir = xopendir("/proc");
unsigned n = bb_getpagesize();
while (1) {
n >>= 1;
if (!n) break;
sp->shift_pages_to_bytes++;
}
sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
sp->dir = xopendir("/proc");
return sp;
}