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[MINOR] slightly optimize time calculation for rbtree 

The new rbtree-based scheduler makes heavy use of tv_cmp2(), and
this function becomes a huge CPU eater. Refine it a little bit in
order to slightly reduce CPU usage.
This commit is contained in:
Willy Tarreau 2007-02-12 00:59:08 +01:00
parent b1b8272a54
commit 5e8f066961
3 changed files with 49 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
include/common/time.h
View File

@ -47,11 +47,18 @@ REGPRM3 struct timeval *tv_delayfrom(struct timeval *tv, const struct timeval *f
*/
REGPRM2 int tv_cmp_ms(const struct timeval *tv1, const struct timeval *tv2);
/*
* compares <tv1> and <tv2> : returns 0 if tv1 < tv2, 1 if tv1 >= tv2,
* considering that 0 is the eternity.
*/
REGPRM2 int tv_cmp_ge2(const struct timeval *tv1, const struct timeval *tv2);
/*
* compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
* considering that 0 is the eternity.
*/
REGPRM2 int tv_cmp2(const struct timeval *tv1, const struct timeval *tv2);
/*
* compares <tv1> and <tv2> modulo 1 ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
* considering that 0 is the eternity.
@ -92,6 +99,20 @@ REGPRM2 static inline int tv_cmp(const struct timeval *tv1, const struct timeval
return 0;
}
/*
* compares <tv1> and <tv2> : returns 0 if tv1 < tv2, 1 if tv1 >= tv2
*/
REGPRM2 static inline int tv_cmp_ge(const struct timeval *tv1, const struct timeval *tv2)
{
if (tv1->tv_sec > tv2->tv_sec)
return 1;
if (tv1->tv_sec < tv2->tv_sec)
return 0;
if (tv1->tv_usec >= tv2->tv_usec)
return 1;
return 0;
}
/*
* returns the difference, in ms, between tv1 and tv2
* Must not be used when either argument is eternity.
@ -144,7 +165,7 @@ REGPRM1 static inline struct timeval *tv_eternity(struct timeval *tv)
*/
REGPRM1 static inline int tv_iseternity(const struct timeval *tv)
{
if (tv->tv_sec == 0 && tv->tv_usec == 0)
if ((tv->tv_sec | tv->tv_usec) == 0)
return 1;
else
return 0;

6
src/task.c
View File

@ -39,7 +39,7 @@ static inline void __rb_insert_task_queue(struct task *newtask)
{
parent = *p;
task = rb_entry(parent, struct task, rb_node);
if (tv_cmp2(&task->expire, &newtask->expire) >= 0)
if (tv_cmp_ge2(&task->expire, &newtask->expire))
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
@ -82,7 +82,7 @@ struct task *task_queue(struct task *task)
node = rb_prev(&task->rb_node);
if (node) {
prev = rb_entry(node, struct task, rb_node);
if (tv_cmp2(&prev->expire, &task->expire) >= 0) {
if (tv_cmp_ge(&prev->expire, &task->expire)) {
task_delete(task);
task->wq = &wait_queue[0];
rb_insert_task_queue(task);
@ -93,7 +93,7 @@ struct task *task_queue(struct task *task)
node = rb_next(&task->rb_node);
if (node) {
next = rb_entry(node, struct task, rb_node);
if (tv_cmp2(&task->expire, &next->expire) > 0) {
if (tv_cmp_ge(&task->expire, &next->expire)) {
task_delete(task);
task->wq = &wait_queue[0];
rb_insert_task_queue(task);

27
src/time.c
View File

@ -13,6 +13,7 @@
#include <sys/time.h>
#include <common/config.h>
#include <common/standard.h>
#include <common/time.h>
struct timeval now; /* the current date at any moment */
@ -58,18 +59,38 @@ REGPRM2 int tv_cmp_ms(const struct timeval *tv1, const struct timeval *tv2)
return 0;
}
/*
* compares <tv1> and <tv2> : returns 0 if tv1 < tv2, 1 if tv1 >= tv2,
* considering that 0 is the eternity.
*/
REGPRM2 int tv_cmp_ge2(const struct timeval *tv1, const struct timeval *tv2)
{
if (unlikely(tv_iseternity(tv1)))
return 1;
if (unlikely(tv_iseternity(tv2)))
return 0; /* same */
if (tv1->tv_sec > tv2->tv_sec)
return 1;
if (tv1->tv_sec < tv2->tv_sec)
return 0;
if (tv1->tv_usec >= tv2->tv_usec)
return 1;
return 0;
}
/*
* compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
* considering that 0 is the eternity.
*/
REGPRM2 int tv_cmp2(const struct timeval *tv1, const struct timeval *tv2)
{
if (tv_iseternity(tv1))
if (tv_iseternity(tv2))
if (unlikely(tv_iseternity(tv1)))
if (unlikely(tv_iseternity(tv2)))
return 0; /* same */
else
return 1; /* tv1 later than tv2 */
else if (tv_iseternity(tv2))
else if (likely(tv_iseternity(tv2)))
return -1; /* tv2 later than tv1 */
if (tv1->tv_sec > tv2->tv_sec)