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https://github.com/sheumann/hush.git
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top: get rid of on-stack variable buffers, use permanent one.
code shrank with and without TOPMEM: top_main 828 844 +16 display_process_list 1525 1473 -52 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 16/-52) Total: -36 bytes top_main 1150 1171 +21 display_topmem_process_list 1150 1167 +17 display_process_list 1525 1473 -52 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 38/-52) Total: -14 bytes
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@ -54,6 +54,7 @@
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# define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
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# if __GNUC_PREREQ (3,0)
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# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
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# define NOINLINE __attribute__((noinline))
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# if !ENABLE_WERROR
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# define ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
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# define ATTRIBUTE_UNUSED_RESULT __attribute__ ((warn_unused_result))
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45
procps/top.c
45
procps/top.c
@ -82,8 +82,10 @@ struct globals {
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/* int hist_iterations; */
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unsigned total_pcpu;
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/* unsigned long total_vsz; */
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char line_buf[80];
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#endif
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};
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enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() \
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do { \
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@ -102,6 +104,7 @@ struct globals {
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#define jif (G.jif )
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#define prev_jif (G.prev_jif )
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#define total_pcpu (G.total_pcpu )
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#define line_buf (G.line_buf )
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#define OPT_BATCH_MODE (option_mask32 & 0x4)
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@ -366,7 +369,7 @@ static unsigned long display_header(int scr_width)
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return total;
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}
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static void display_process_list(int count, int scr_width)
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static NOINLINE void display_process_list(int count, int scr_width)
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{
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enum {
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BITS_PER_INT = sizeof(int)*8
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@ -447,7 +450,6 @@ static void display_process_list(int count, int scr_width)
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scr_width += 2; /* account for leading '\n' and trailing NUL */
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/* Ok, all preliminary data is ready, go thru the list */
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while (count-- > 0) {
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char buf[scr_width];
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unsigned col;
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CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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@ -459,7 +461,7 @@ static void display_process_list(int count, int scr_width)
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else
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sprintf(vsz_str_buf, "%7ld", s->vsz);
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// PID PPID USER STAT VSZ %MEM [%CPU] COMMAND
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col = snprintf(buf, scr_width,
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col = snprintf(line_buf, scr_width,
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"\n" "%5u%6u %-8.8s %s%s" FMT
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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FMT
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@ -473,8 +475,8 @@ static void display_process_list(int count, int scr_width)
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#endif
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);
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if (col < scr_width)
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read_cmdline(buf + col, scr_width - col, s->pid, s->comm);
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fputs(buf, stdout);
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read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
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fputs(line_buf, stdout);
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/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
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jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
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s++;
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@ -722,33 +724,32 @@ static void smart_ulltoa6(unsigned long long ul, char buf[6])
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buf[5] = ' ';
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}
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static void display_topmem_process_list(int count, int scr_width)
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static NOINLINE void display_topmem_process_list(int count, int scr_width)
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{
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#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
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#define MIN_WIDTH sizeof(HDR_STR)
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const topmem_status_t *s = topmem;
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char buf[scr_width | MIN_WIDTH]; /* a|b is a cheap max(a,b) */
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display_topmem_header(scr_width);
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strcpy(buf, HDR_STR " COMMAND");
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buf[5 + sort_field * 6] = '*';
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, buf);
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strcpy(line_buf, HDR_STR " COMMAND");
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line_buf[5 + sort_field * 6] = '*';
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
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while (--count >= 0) {
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// PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND
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smart_ulltoa6(s->pid , &buf[0*6]);
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smart_ulltoa6(s->vsz , &buf[1*6]);
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smart_ulltoa6(s->vszrw , &buf[2*6]);
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smart_ulltoa6(s->rss , &buf[3*6]);
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smart_ulltoa6(s->rss_sh , &buf[4*6]);
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smart_ulltoa6(s->dirty , &buf[5*6]);
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smart_ulltoa6(s->dirty_sh, &buf[6*6]);
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smart_ulltoa6(s->stack , &buf[7*6]);
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buf[8*6] = '\0';
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smart_ulltoa6(s->pid , &line_buf[0*6]);
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smart_ulltoa6(s->vsz , &line_buf[1*6]);
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smart_ulltoa6(s->vszrw , &line_buf[2*6]);
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smart_ulltoa6(s->rss , &line_buf[3*6]);
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smart_ulltoa6(s->rss_sh , &line_buf[4*6]);
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smart_ulltoa6(s->dirty , &line_buf[5*6]);
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smart_ulltoa6(s->dirty_sh, &line_buf[6*6]);
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smart_ulltoa6(s->stack , &line_buf[7*6]);
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line_buf[8*6] = '\0';
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if (scr_width > MIN_WIDTH) {
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read_cmdline(&buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
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read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
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}
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printf("\n""%.*s", scr_width, buf);
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printf("\n""%.*s", scr_width, line_buf);
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s++;
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}
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putchar(OPT_BATCH_MODE ? '\n' : '\r');
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@ -848,6 +849,8 @@ int top_main(int argc, char **argv)
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continue;
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}
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#endif /* FEATURE_USE_TERMIOS */
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if (col > LINE_BUF_SIZE-2) /* +2 bytes for '\n', NUL, */
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col = LINE_BUF_SIZE-2;
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if (!ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && scan_mask == TOP_MASK)
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lines -= 3;
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else
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