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top: improve large PID display in memory ('s') mode

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Display VSZ[RW] fields in more compact form if PID is wider.

function                                             old     new   delta
display_topmem_process_list                          564     614     +50
ulltoa5_and_space                                      -      14     +14
ulltoa6_and_space                                     14       -     -14
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 1/0 up/down: 64/-14)             Total: 50 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2023-11-23 01:18:02 +01:00
parent a63b60bdd6
commit 28f4126093
1 changed files with 28 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

41
procps/top.c
View file

@ -713,7 +713,10 @@ typedef struct { unsigned quot, rem; } bb_div_t;
ppu = ppubuf;
if (n != 6+6+8) {
/* Format PID PPID USER part into 6+6+8 chars:
* shrink PID/PPID if possible, then truncate USER
* shrink PID/PPID if possible, then truncate USER.
* Tested on Linux 5.18.0:
* sysctl kernel.pid_max=4194304 is the maximum allowed,
* so PID and PPID are 7 chars wide at most.
*/
char *p, *pp;
if (*ppu == ' ') {
@ -857,11 +860,15 @@ static void display_topmem_header(int scr_width, int *lines_rem_p)
(*lines_rem_p) -= 3;
}
static void ulltoa6_and_space(unsigned long long ul, char buf[6])
{
/* see http://en.wikipedia.org/wiki/Tera */
static void ulltoa5_and_space(unsigned long long ul, char buf[6])
{
smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
}
static void ulltoa4_and_space(unsigned long long ul, char buf[5])
{
smart_ulltoa4(ul, buf, " mgtpezy")[0] = ' ';
}
static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
{
@ -887,16 +894,24 @@ static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
while (--lines_rem >= 0) {
/* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
int n = sprintf(line_buf, "%5u ", s->pid);
ulltoa6_and_space(s->vsz , &line_buf[1*6]);
if (n > 7 || (n == 7 && line_buf[6] != ' '))
/* PID and VSZ are clumped together, truncate PID */
line_buf[5] = '.';
ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
ulltoa6_and_space(s->rss , &line_buf[3*6]);
ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
ulltoa6_and_space(s->dirty , &line_buf[5*6]);
ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
ulltoa6_and_space(s->stack , &line_buf[7*6]);
if (n > 7) {
/* PID is 7 chars long (up to 4194304) */
ulltoa4_and_space(s->vsz , &line_buf[8]);
ulltoa4_and_space(s->vszrw, &line_buf[8+5]);
/* the next field (RSS) starts at 8+10 = 3*6 */
} else {
if (n == 7) /* PID is 6 chars long */
ulltoa4_and_space(s->vsz, &line_buf[7]);
/* the next field (VSZRW) starts at 7+5 = 2*6 */
else /* PID is 5 chars or less */
ulltoa5_and_space(s->vsz, &line_buf[6]);
ulltoa5_and_space(s->vszrw, &line_buf[2*6]);
}
ulltoa5_and_space(s->rss , &line_buf[3*6]);
ulltoa5_and_space(s->rss_sh , &line_buf[4*6]);
ulltoa5_and_space(s->dirty , &line_buf[5*6]);
ulltoa5_and_space(s->dirty_sh, &line_buf[6*6]);
ulltoa5_and_space(s->stack , &line_buf[7*6]);
line_buf[8*6] = '\0';
if (scr_width > (int)MIN_WIDTH) {
read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);