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top: switch to malloced "globals".

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This seems to be more efficient:

function                                             old     new   delta
clearmems                                              -      28     +28
display_process_list                                1001    1018     +17
read_cpu_jiffy                                       171     177      +6
do_stats                                             194     198      +4
reset_term                                            20      23      +3
topmem_sort                                           63      65      +2
mult_lvl_cmp                                          44      45      +1
get_jiffy_counts                                     247     248      +1
display_topmem_process_list                          549     546      -3
top_main                                             912     879     -33
handle_input                                         630     549     -81
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 7/3 up/down: 62/-117)           Total: -55 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-08-16 11:40:10 +02:00
parent 9832bbaba9
commit d80302db99
1 changed files with 6 additions and 7 deletions
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13
procps/top.c
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@ -116,7 +116,6 @@
//kbuild:lib-$(CONFIG_TOP) += top.o
#include "libbb.h"
#include "common_bufsiz.h"
typedef struct top_status_t {
@ -154,6 +153,8 @@ typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
enum { SORT_DEPTH = 3 };
/* Screens wider than this are unlikely */
enum { LINE_BUF_SIZE = 512 - 64 };
struct globals {
top_status_t *top;
@ -192,10 +193,9 @@ struct globals {
#if ENABLE_FEATURE_TOP_INTERACTIVE
char kbd_input[KEYCODE_BUFFER_SIZE];
#endif
char line_buf[80];
}; //FIX_ALIASING; - large code growth
enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
#define G (*(struct globals*)bb_common_bufsiz1)
char line_buf[LINE_BUF_SIZE];
};
#define G (*ptr_to_globals)
#define top (G.top )
#define ntop (G.ntop )
#define sort_field (G.sort_field )
@ -213,8 +213,7 @@ enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
#define total_pcpu (G.total_pcpu )
#define line_buf (G.line_buf )
#define INIT_G() do { \
setup_common_bufsiz(); \
BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
} while (0)