diff options
| author | Denys Vlasenko <vda.linux@googlemail.com> | 2020-12-14 18:49:23 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2020-12-14 18:54:30 +0100 |
| commit | c7b858ff8d2e8b2d785f74b2d319bc9c839f4faa (patch) | |
| tree | 9ad109d5999444dfb3a281678b6b63d2570a76cd /miscutils | |
| parent | fd3c512f88d43e6633bd3c3110cfa0bb321adaa8 (diff) | |
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 <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils')
| -rw-r--r-- | miscutils/devmem.c | 2 | ||||
| -rw-r--r-- | miscutils/hexedit.c | 14 | ||||
| -rw-r--r-- | miscutils/time.c | 7 |
3 files changed, 10 insertions, 13 deletions
diff --git a/miscutils/devmem.c b/miscutils/devmem.c index e8dce5225..f9f0276bc 100644 --- a/miscutils/devmem.c +++ b/miscutils/devmem.c @@ -75,7 +75,7 @@ int devmem_main(int argc UNUSED_PARAM, char **argv) bb_show_usage(); /* one of bb_strtouXX failed */ fd = xopen("/dev/mem", argv[3] ? (O_RDWR | O_SYNC) : (O_RDONLY | O_SYNC)); - mapped_size = page_size = getpagesize(); + mapped_size = page_size = bb_getpagesize(); offset_in_page = (unsigned)target & (page_size - 1); if (offset_in_page + width > page_size) { /* This access spans pages. diff --git a/miscutils/hexedit.c b/miscutils/hexedit.c index 898d77376..f8ff9b62b 100644 --- a/miscutils/hexedit.c +++ b/miscutils/hexedit.c @@ -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) { diff --git a/miscutils/time.c b/miscutils/time.c index d15d363f3..0006c59d8 100644 --- a/miscutils/time.c +++ b/miscutils/time.c @@ -111,6 +111,10 @@ static void printargv(char *const *argv) This is funky since the pagesize could be less than 1K. Note: Some machines express getrusage statistics in terms of K, others in terms of pages. */ +#ifdef BB_ARCH_FIXED_PAGESIZE +# define pagesize BB_ARCH_FIXED_PAGESIZE +# define ptok(pagesize, pages) ptok(pages) +#endif static unsigned long ptok(const unsigned pagesize, const unsigned long pages) { unsigned long tmp; @@ -124,6 +128,7 @@ static unsigned long ptok(const unsigned pagesize, const unsigned long pages) tmp = pages * pagesize; /* Larger first, */ return tmp / 1024; /* then smaller. */ } +#undef pagesize /* summarize: Report on the system use of a command. @@ -177,7 +182,7 @@ static void summarize(const char *fmt, char **command, resource_t *resp) { unsigned vv_ms; /* Elapsed virtual (CPU) milliseconds */ unsigned cpu_ticks; /* Same, in "CPU ticks" */ - unsigned pagesize = getpagesize(); + unsigned pagesize = bb_getpagesize(); /* Impossible: we do not use WUNTRACED flag in wait()... if (WIFSTOPPED(resp->waitstatus)) |