kernel: avoid padblock copying for devtls/devssl/esp, cleanup debugging

to avoid copying in padblock() when adding cryptographics macs to a block
in devtls/devssl/esp we reserve 16 extra bytes to the allocation.

remove qio ixsummary() function and add acid function qiostats() to
/sys/lib/acid/kernel

simplify iallocb(), remove iallocsummary() statitics.

sys/lib/acid/kernel

@@ -55,6 +55,16 @@ defn imagecache() {
 	}
 }
 
+defn qiostats() {
+	print ("padblockcnt=", *padblockcnt\D, "\n");
+	print ("concatblockcnt=", *concatblockcnt\D, "\n");
+	print ("pullupblockcnt=", *pullupblockcnt\D, "\n");
+	print ("copyblockcnt=", *copyblockcnt\D, "\n");
+	print ("consumecnt=", *consumecnt\D, "\n");
+	print ("producecnt=", *producecnt\D, "\n");
+	print ("qcopycnt=", *qcopycnt\D, "\n");
+}
+
 // dump channels
 defn chan(c) {
 	local d, q;

sys/src/9/port/allocb.c

@@ -8,21 +8,17 @@
 enum
 {
 	Hdrspc		= 64,		/* leave room for high-level headers */
+	Tlrspc		= 16,		/* extra room at the end for pad/crc/mac */
 	Bdead		= 0x51494F42,	/* "QIOB" */
 };
 
-struct
-{
-	Lock;
-	ulong	bytes;
-} ialloc;
-
 static Block*
 _allocb(int size)
 {
 	Block *b;
 	uintptr addr;
 
+	size += Tlrspc;
 	if((b = mallocz(sizeof(Block)+size+Hdrspc, 0)) == nil)
 		return nil;
 
@@ -58,7 +54,6 @@ allocb(int size)
 
 	/*
 	 * Check in a process and wait until successful.
-	 * Can still error out of here, though.
 	 */
 	if(up == nil)
 		panic("allocb without up: %#p", getcallerpc(&size));
@@ -82,34 +77,22 @@ Block*
 iallocb(int size)
 {
 	Block *b;
-	static int m1, m2, mp;
-
-	if(ialloc.bytes > conf.ialloc){
-		if((m1++%10000)==0){
-			if(mp++ > 1000)
-				panic("iallocb: out of memory");
-			iprint("iallocb: limited %lud/%lud\n",
-				ialloc.bytes, conf.ialloc);
-		}
-		return nil;
-	}
 
 	if((b = _allocb(size)) == nil){
-		if((m2++%10000)==0){
-			if(mp++ > 1000)
-				panic("iallocb: out of memory");
-			iprint("iallocb: no memory %lud/%lud\n",
-				ialloc.bytes, conf.ialloc);
+		static ulong nerr;
+		if((nerr++%10000)==0){
+			if(nerr > 10000000){
+				xsummary();
+				mallocsummary();
+				panic("iallocb: out of memory")
+			}
+			iprint("iallocb: no memory for %d bytes\n", size);
 		}
 		return nil;
 	}
 	setmalloctag(b, getcallerpc(&size));
 	b->flag = BINTR;
 
-	ilock(&ialloc);
-	ialloc.bytes += b->lim - b->base;
-	iunlock(&ialloc);
-
 	return b;
 }
 
@@ -129,11 +112,6 @@ freeb(Block *b)
 		b->free(b);
 		return;
 	}
-	if(b->flag & BINTR) {
-		ilock(&ialloc);
-		ialloc.bytes -= b->lim - b->base;
-		iunlock(&ialloc);
-	}
 
 	/* poison the block in case someone is still holding onto it */
 	b->next = dead;
@@ -171,9 +149,3 @@ checkb(Block *b, char *msg)
 	if(b->wp > b->lim)
 		panic("checkb 4 %s %#p %#p", msg, b->wp, b->lim);
 }
-
-void
-iallocsummary(void)
-{
-	print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
-}

sys/src/9/port/portfns.h

@@ -129,7 +129,6 @@ long		hostownerwrite(char*, int);
 void 		(*hwrandbuf)(void*, ulong);
 void		hzsched(void);
 Block*		iallocb(int);
-void		iallocsummary(void);
 uintptr		ibrk(uintptr, int);
 void		ilock(Lock*);
 void		interrupted(void);
@@ -143,7 +142,6 @@ int		iseve(void);
 int		islo(void);
 Segment*	isoverlap(uintptr, uintptr);
 Physseg*	findphysseg(char*);
-void		ixsummary(void);
 void		kickpager(void);
 void		killbig(char*);
 void		kproc(char*, void(*)(void*), void*);

sys/src/9/port/qio.c

@@ -13,8 +13,6 @@ static ulong consumecnt;
 static ulong producecnt;
 static ulong qcopycnt;
 
-static int debugging;
-
 #define QDEBUG	if(0)
 
 /*
@@ -56,17 +54,6 @@ enum
 
 uint	qiomaxatomic = Maxatomic;
 
-void
-ixsummary(void)
-{
-	debugging ^= 1;
-	iallocsummary();
-	print("pad %lud, concat %lud, pullup %lud, copy %lud\n",
-		padblockcnt, concatblockcnt, pullupblockcnt, copyblockcnt);
-	print("consume %lud, produce %lud, qcopy %lud\n",
-		consumecnt, producecnt, qcopycnt);
-}
-
 /*
  *  free a list of blocks
  */