emo/procps
1
0
Fork 0
Code Issues Pull Requests Packages Releases Activity

top: for performance, employ additional inlining

Browse Source 
The 'refactor and enhance column width management'
recent redesign produced many subsequent benefits,
the latest of which is automatically sized fixed-width
non-scalable columns.

As expected, there was a cost associated with these
many enhancements.  That cost has now been identified
as a 1-4% performance degradation, depending on which
fields are being displayed.

This increased cost arises principally from current
drawing related function calls, whereas top-3.3.3 did
most of its drawing via macros effectively inlining
those duties.

This commit inlines the equivalent drawing functions,
thus eliminating the function call penalty, and places
this top on a par with top-3.3.3.  The trade off is a
modest additional 4k in executable size.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2012-10-05 15:15:15 -05:00 committed by Craig Small
parent f005411974
commit e77c8e8cf0
2 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
top/top.c
View File

@ -1169,7 +1169,7 @@ static inline const char *justify_pad (const char *str, int width, int justr) {
/*
* Make and then justify a single character. */
static const char *make_chr (const char ch, int width, int justr) {
static inline const char *make_chr (const char ch, int width, int justr) {
static char buf[SMLBUFSIZ];
snprintf(buf, sizeof(buf), "%c", ch);
@ -1180,7 +1180,7 @@ static const char *make_chr (const char ch, int width, int justr) {
/*
* Make and then justify an integer NOT subject to scaling,
* and include a visual clue should tuncation be necessary. */
static const char *make_num (long num, int width, int justr, int col) {
static inline const char *make_num (long num, int width, int justr, int col) {
static char buf[SMLBUFSIZ];
if (width < snprintf(buf, sizeof(buf), "%ld", num)) {
@ -1194,7 +1194,7 @@ static const char *make_num (long num, int width, int justr, int col) {
/*
* Make and then justify a character string,
* and include a visual clue should tuncation be necessary. */
static const char *make_str (const char *str, int width, int justr, int col) {
static inline const char *make_str (const char *str, int width, int justr, int col) {
static char buf[SCREENMAX];
if (width < snprintf(buf, sizeof(buf), "%s", str)) {
@ -1207,7 +1207,7 @@ static const char *make_str (const char *str, int width, int justr, int col) {
/*
* Make and then justify a percentage, with decreasing precision. */
static const char *scale_pcnt (float num, int width, int justr) {
static inline const char *scale_pcnt (float num, int width, int justr) {
static char buf[SMLBUFSIZ];
#ifdef PERCENTBOOST

8
top/top.h
View File

@ -612,10 +612,10 @@ typedef struct WIN_t {
//atic inline int user_matched (WIN_t *q, const proc_t *p);
/*------ Basic Formatting support --------------------------------------*/
//atic inline const char *justify_pad (const char *str, int width, int justr);
//atic const char *make_chr (const char ch, int width, int justr);
//atic const char *make_num (long num, int width, int justr, int col);
//atic const char *make_str (const char *str, int width, int justr, int col);
//atic const char *scale_pcnt (float num, int width, int justr);
//atic inline const char *make_chr (const char ch, int width, int justr);
//atic inline const char *make_num (long num, int width, int justr, int col);
//atic inline const char *make_str (const char *str, int width, int justr, int col);
//atic inline const char *scale_pcnt (float num, int width, int justr);
//atic const char *scale_tics (TIC_t tics, int width, int justr);
//atic const char *scale_unum (unsigned long num, int type, int width, int justr);
/*------ Fields Management support -------------------------------------*/