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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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10
archival/rpm.c
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@@ -83,7 +83,9 @@ struct globals {
void *map;
rpm_index *mytags;
int tagcount;
unsigned mapsize, pagesize;
unsigned mapsize;
IF_VARIABLE_ARCH_PAGESIZE(unsigned pagesize;)
#define G_pagesize cached_pagesize(G.pagesize)
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
@@ -141,7 +143,7 @@ static int rpm_gettags(const char *filename)
G.mytags = tags;
/* Map the store */
storepos = (storepos + G.pagesize) & -(int)G.pagesize;
storepos = (storepos + G_pagesize) & -(int)G_pagesize;
/* remember size for munmap */
G.mapsize = storepos;
/* some NOMMU systems prefer MAP_PRIVATE over MAP_SHARED */
@@ -356,7 +358,7 @@ int rpm_main(int argc, char **argv)
int opt, func = 0;
INIT_G();
G.pagesize = getpagesize();
INIT_PAGESIZE(G.pagesize);
while ((opt = getopt(argc, argv, "iqpldc")) != -1) {
switch (opt) {
@@ -523,7 +525,7 @@ int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
int rpm_fd;
INIT_G();
G.pagesize = getpagesize();
INIT_PAGESIZE(G.pagesize);
rpm_fd = rpm_gettags(argv[1]);