tvttracelevel - plan9port - [fork] Plan 9 from user space
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---
(DIR) commit 6cd6f689109a3021bd81cbdd62a738e26b693f23
(DIR) parent 663017560218b62119022f9f4360cf6eb05a36e2
(HTM) Author: rsc <devnull@localhost>
Date: Fri, 5 May 2006 13:17:28 +0000
vttracelevel
Diffstat:
M src/libventi/cache.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
---
(DIR) diff --git a/src/libventi/cache.c b/src/libventi/cache.c
t@@ -15,6 +15,7 @@
int vtcachenread;
int vtcachencopy;
int vtcachenwrite;
+int vttracelevel;
enum {
BioLocal = 1,
t@@ -367,9 +368,14 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
int n;
u32int addr;
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d from %p\n", score, type, getcallerpc(&c));
addr = vtglobaltolocal(score);
- if(addr != NilBlock)
+ if(addr != NilBlock){
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => local\n", score, type);
return vtcachelocal(c, addr, type);
+ }
h = (u32int)(score[0]|(score[1]<<8)|(score[2]<<16)|(score[3]<<24)) % c->nhash;
t@@ -383,15 +389,20 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
heapdel(b);
b->ref++;
qunlock(&c->lk);
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => found in cache %p; locking\n", score, type, b);
qlock(&b->lk);
b->nlock = 1;
if(b->iostate == BioVentiError){
if(chattyventi)
fprint(2, "cached read error for %V\n", score);
- werrstr("venti i/o error");
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => cache read error\n", score, typ werrstr("venti i/o error");
vtblockput(b);
return nil;
}
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => found in cache; returning\n", score, type);
return b;
}
t@@ -417,6 +428,8 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
* the block here can never be the block in a vtblockwrite, so we're safe.
* We're certainly living on the edge.
*/
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => bumped; locking %p\n", score, type, b);
qlock(&b->lk);
b->nlock = 1;
qunlock(&c->lk);
t@@ -426,6 +439,8 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
if(n < 0){
if(chattyventi)
fprint(2, "read %V: %r\n", score);
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => bumped; read error\n", score, type);
b->iostate = BioVentiError;
vtblockput(b);
return nil;
t@@ -433,7 +448,8 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
vtzeroextend(type, b->data, n, c->blocksize);
b->iostate = BioVenti;
b->nlock = 1;
- return b;
+ if(vttracelevel)
+ fprint(2, "vtcacheglobal %V %d => loaded into cache; returning\n", score, ty return b;
}
/*
t@@ -462,6 +478,8 @@ vtblockput(VtBlock* b)
return;
if(0)fprint(2, "vtblockput: %d: %x %d %d\n", getpid(), b->addr, c->nheap, b->iostate);
+ if(vttracelevel)
+ fprint(2, "vtblockput %p from %p\n", b, getcallerpc(&b));
if(--b->nlock > 0)
return;