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latencytop: optimize LT_BACKTRACEDEPTH loops a bit

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There is no need to loop any longer when 'same == 0'.

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dmitry Adamushko 2008-02-17 22:34:07 +01:00 committed by Ingo Molnar
parent 50df5d6aea
commit 19fb518c2a
1 changed files with 17 additions and 10 deletions
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27
kernel/latencytop.c
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@ -64,8 +64,8 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
return; return;
for (i = 0; i < MAXLR; i++) { for (i = 0; i < MAXLR; i++) {
int q; int q, same = 1;
int same = 1;
/* Nothing stored: */ /* Nothing stored: */
if (!latency_record[i].backtrace[0]) { if (!latency_record[i].backtrace[0]) {
if (firstnonnull > i) if (firstnonnull > i)
@ -73,12 +73,15 @@ account_global_scheduler_latency(struct task_struct *tsk, struct latency_record
continue; continue;
} }
for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) { for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
if (latency_record[i].backtrace[q] != unsigned long record = lat->backtrace[q];
lat->backtrace[q])
if (latency_record[i].backtrace[q] != record) {
same = 0; same = 0;
if (same && lat->backtrace[q] == 0)
break; break;
if (same && lat->backtrace[q] == ULONG_MAX) }
/* 0 and ULONG_MAX entries mean end of backtrace: */
if (record == 0 || record == ULONG_MAX)
break; break;
} }
if (same) { if (same) {
@ -143,14 +146,18 @@ account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
for (i = 0; i < LT_SAVECOUNT ; i++) { for (i = 0; i < LT_SAVECOUNT ; i++) {
struct latency_record *mylat; struct latency_record *mylat;
int same = 1; int same = 1;
mylat = &tsk->latency_record[i]; mylat = &tsk->latency_record[i];
for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) { for (q = 0 ; q < LT_BACKTRACEDEPTH ; q++) {
if (mylat->backtrace[q] != unsigned long record = lat.backtrace[q];
lat.backtrace[q])
if (mylat->backtrace[q] != record) {
same = 0; same = 0;
if (same && lat.backtrace[q] == 0)
break; break;
if (same && lat.backtrace[q] == ULONG_MAX) }
/* 0 and ULONG_MAX entries mean end of backtrace: */
if (record == 0 || record == ULONG_MAX)
break; break;
} }
if (same) { if (same) {