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free: add -b/k/m/g options; remove 4 TB limitation. +100 bytes

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Based on patch by Stefan Tomanek (stefan@pico.ruhr.de)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-10-01 21:57:59 +02:00
parent ee5ab8f321
commit 5542934d65
1 changed files with 56 additions and 42 deletions
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98
procps/free.c
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@ -11,47 +11,58 @@
#include "libbb.h"
struct globals {
unsigned mem_unit;
#if ENABLE_DESKTOP
unsigned unit_steps;
# define G_unit_steps G.unit_steps
#else
# define G_unit_steps 10
#endif
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { } while (0)
static unsigned long long scale(unsigned long d)
{
return ((unsigned long long)d * G.mem_unit) >> G_unit_steps;
}
int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
{
struct sysinfo info;
unsigned mem_unit;
INIT_G();
#if ENABLE_DESKTOP
if (argv[1] && argv[1][0] == '-')
bb_show_usage();
G.unit_steps = 10;
if (argv[1] && argv[1][0] == '-') {
switch (argv[1][1]) {
case 'b':
G.unit_steps = 0;
break;
case 'k': /* 2^10 */
/* G.unit_steps = 10; - already is */
break;
case 'm': /* 2^(2*10) */
G.unit_steps = 20;
break;
case 'g': /* 2^(3*10) */
G.unit_steps = 30;
break;
default:
bb_show_usage();
}
}
#endif
sysinfo(&info);
/* Kernels prior to 2.4.x will return info.mem_unit==0, so cope... */
mem_unit = 1;
if (info.mem_unit != 0) {
mem_unit = info.mem_unit;
}
/* Convert values to kbytes */
if (mem_unit == 1) {
info.totalram >>= 10;
info.freeram >>= 10;
#if BB_MMU
info.totalswap >>= 10;
info.freeswap >>= 10;
#endif
info.sharedram >>= 10;
info.bufferram >>= 10;
} else {
mem_unit >>= 10;
/* TODO: Make all this stuff not overflow when mem >= 4 Tb */
info.totalram *= mem_unit;
info.freeram *= mem_unit;
#if BB_MMU
info.totalswap *= mem_unit;
info.freeswap *= mem_unit;
#endif
info.sharedram *= mem_unit;
info.bufferram *= mem_unit;
}
G.mem_unit = (info.mem_unit ? info.mem_unit : 1);
printf(" %13s%13s%13s%13s%13s\n",
"total",
@ -63,30 +74,33 @@ int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
* /proc/meminfo instead and get "Cached: NNN kB" from there.
*/
);
#define FIELDS_5 "%13lu%13lu%13lu%13lu%13lu\n"
#define FIELDS_3 (FIELDS_5 + 2*5)
#define FIELDS_2 (FIELDS_5 + 3*5)
#define FIELDS_5 "%13llu%13llu%13llu%13llu%13llu\n"
#define FIELDS_3 (FIELDS_5 + 2*6)
#define FIELDS_2 (FIELDS_5 + 3*6)
printf("Mem: ");
printf(FIELDS_5,
info.totalram,
info.totalram - info.freeram,
info.freeram,
info.sharedram, info.bufferram
scale(info.totalram),
scale(info.totalram - info.freeram),
scale(info.freeram),
scale(info.sharedram),
scale(info.bufferram)
);
/* Show alternate, more meaningful busy/free numbers by counting
* buffer cache as free memory (make it "-/+ buffers/cache"
* if/when we add support for "cached" column): */
printf("-/+ buffers: ");
printf(FIELDS_2,
info.totalram - info.freeram - info.bufferram,
info.freeram + info.bufferram
scale(info.totalram - info.freeram - info.bufferram),
scale(info.freeram + info.bufferram)
);
#if BB_MMU
printf("Swap:");
printf(FIELDS_3,
info.totalswap,
info.totalswap - info.freeswap,
info.freeswap
scale(info.totalswap),
scale(info.totalswap - info.freeswap),
scale(info.freeswap)
);
#endif
return EXIT_SUCCESS;