diff options
Diffstat (limited to 'src/cmd/venti/srv/disksched.c')
| -rw-r--r-- | src/cmd/venti/srv/disksched.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/src/cmd/venti/srv/disksched.c b/src/cmd/venti/srv/disksched.c index d43b64c7..0315425c 100644 --- a/src/cmd/venti/srv/disksched.c +++ b/src/cmd/venti/srv/disksched.c @@ -15,7 +15,7 @@ disksched(void) ulong t; vlong cflush; Stats *prev; - + /* * no locks because all the data accesses are atomic. */ @@ -40,22 +40,22 @@ disksched(void) /* # entries written to index cache */ nwrite = stats.n[StatIcacheWrite] - prev->n[StatIcacheWrite]; - + /* # dirty entries in index cache */ ndirty = stats.n[StatIcacheDirty] - prev->n[StatIcacheDirty]; - + /* # entries flushed to disk */ nflush = nwrite - ndirty; - + /* want to stay around 70% dirty */ tdirty = (vlong)stats.n[StatIcacheSize]*700/1000; - + /* assume nflush*icachesleeptime is a constant */ cflush = (vlong)nflush*(icachesleeptime+1); - + /* computer number entries to write in next minute */ toflush = nwrite + (stats.n[StatIcacheDirty] - tdirty); - + /* schedule for that many */ if(toflush <= 0 || cflush/toflush > 100000) icachesleeptime = SleepForever; @@ -86,4 +86,3 @@ diskaccess(int level) } lasttime[level] = time(0); } - |