diff options
Diffstat (limited to 'src/cmd/venti/srv/lumpcache.c')
| -rw-r--r-- | src/cmd/venti/srv/lumpcache.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/cmd/venti/srv/lumpcache.c b/src/cmd/venti/srv/lumpcache.c index b989c3cb..d9a6b954 100644 --- a/src/cmd/venti/srv/lumpcache.c +++ b/src/cmd/venti/srv/lumpcache.c @@ -71,7 +71,7 @@ lookuplump(u8int *score, int type) Lump *b; u32int h; - ms = msec(); + ms = 0; trace(TraceLump, "lookuplump enter"); h = hashbits(score, HashLog); @@ -112,6 +112,9 @@ again: CHECK(checklumpcache()); } + /* start timer on cache miss to avoid system call on cache hit */ + ms = msec(); + addstat(StatLcacheMiss, 1); b = lumpcache.free; lumpcache.free = b->next; @@ -151,7 +154,7 @@ found: addstat(StatLumpStall, -1); trace(TraceLump, "lookuplump exit"); - addstat2(StatLcacheRead, 1, StatLcacheReadTime, msec()-ms); + addstat2(StatLcacheRead, 1, StatLcacheReadTime, ms ? msec()-ms : 0); return b; } |