cirno/plan9front
1
0
Fork 0
mirror of git://git.9front.org/plan9front/plan9front synced 2025-01-12 11:10:06 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

kernel: remove unused lockstats and make lock() return type void

Browse source 
remove the global statistics counters from taslock.c
as they'r not particularily usefull nor precise
and just cause unneccessary cache traffic.

if we want them back, we should place them into
the Mach structure.

also change the lock() function prototype to return void.
This commit is contained in:
cinap_lenrek 2024-10-06 16:02:13 +00:00
parent 40177b86bf
commit 96bf1d3ebd
2 changed files with 4 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
sys/src/9/port/portfns.h
View file

@ -166,7 +166,7 @@ void (*kproftimer)(uintptr);
void ksetenv(char*, char*, int);
void kstrcpy(char*, char*, int);
void kstrdup(char**, char*);
int lock(Lock*);
void lock(Lock*);
void logopen(Log*);
void logclose(Log*);
char* logctl(Log*, int, char**, Logflag*);

19
sys/src/9/port/taslock.c
View file

@ -16,13 +16,6 @@ uintptr maxilockpc;
uintptr ilockpcs[0x100] = { [0xff] = 1 };
#endif
struct
{
ulong locks;
ulong glare;
ulong inglare;
} lockstats;
void
lockloop(Lock *l, uintptr pc)
{
@ -39,7 +32,7 @@ lockloop(Lock *l, uintptr pc)
dumpaproc(p);
}
int
void
lock(Lock *l)
{
int i;
@ -47,7 +40,6 @@ lock(Lock *l)
pc = getcallerpc(&l);
lockstats.locks++;
if(up)
up->nlocks++; /* prevent being scheded */
if(tas(&l->key) == 0){
@ -60,14 +52,12 @@ lock(Lock *l)
#ifdef LOCKCYCLES
l->lockcycles = -lcycles();
#endif
return 0;
return;
}
if(up)
up->nlocks--;
lockstats.glare++;
for(;;){
lockstats.inglare++;
i = 0;
while(l->key){
if(conf.nmach < 2 && up && up->edf && (up->edf->flags & Admitted)){
@ -96,7 +86,7 @@ lock(Lock *l)
#ifdef LOCKCYCLES
l->lockcycles = -lcycles();
#endif
return 1;
return;
}
if(up)
up->nlocks--;
@ -110,18 +100,15 @@ ilock(Lock *l)
uintptr pc;
pc = getcallerpc(&l);
lockstats.locks++;
x = splhi();
if(tas(&l->key) != 0){
lockstats.glare++;
/*
* Cannot also check l->pc, l->m, or l->isilock here
* because they might just not be set yet, or
* (for pc and m) the lock might have just been unlocked.
*/
for(;;){
lockstats.inglare++;
splx(x);
while(l->key)
;