All linpools use pages to allocate regular blocks

1 files changed, 20 insertions, 46 deletions

diff --git a/lib/mempool.c b/lib/mempool.c
index c75f1f5b..325b1ecf 100644
--- a/lib/mempool.c
+++ b/lib/mempool.c
@@ -27,19 +27,18 @@
 
 struct lp_chunk {
   struct lp_chunk *next;
-  uint size;
   uintptr_t data_align[0];
   byte data[0];
 };
 
-const int lp_chunk_size = sizeof(struct lp_chunk);
+#define LP_DATA_SIZE	(page_size - OFFSETOF(struct lp_chunk, data))
 
 struct linpool {
   resource r;
   byte *ptr, *end;
   struct lp_chunk *first, *current;		/* Normal (reusable) chunks */
   struct lp_chunk *first_large;			/* Large chunks */
-  uint chunk_size, threshold, total:31, use_pages:1, total_large;
+  uint total, total_large;
 };
 
 _Thread_local linpool *tmp_linpool;
@@ -61,25 +60,14 @@ static struct resclass lp_class = {
 /**
  * lp_new - create a new linear memory pool
  * @p: pool
- * @blk: block size
  *
  * lp_new() creates a new linear memory pool resource inside the pool @p.
- * The linear pool consists of a list of memory chunks of size at least
- * @blk.
+ * The linear pool consists of a list of memory chunks of page size.
  */
 linpool
-*lp_new(pool *p, uint blk)
+*lp_new(pool *p)
 {
-  linpool *m = ralloc(p, &lp_class);
-  if (!blk)
-  {
-    m->use_pages = 1;
-    blk = page_size - lp_chunk_size;
-  }
-
-  m->chunk_size = blk;
-  m->threshold = 3*blk/4;
-  return m;
+  return ralloc(p, &lp_class);
 }
 
 /**
@@ -110,14 +98,13 @@ lp_alloc(linpool *m, uint size)
   else
     {
       struct lp_chunk *c;
-      if (size >= m->threshold)
+      if (size > LP_DATA_SIZE)
 	{
 	  /* Too large => allocate large chunk */
 	  c = xmalloc(sizeof(struct lp_chunk) + size);
 	  m->total_large += size;
 	  c->next = m->first_large;
 	  m->first_large = c;
-	  c->size = size;
 	}
       else
 	{
@@ -129,14 +116,10 @@ lp_alloc(linpool *m, uint size)
 	  else
 	    {
 	      /* Need to allocate a new chunk */
-	      if (m->use_pages)
-		c = alloc_page();
-	      else
-		c = xmalloc(sizeof(struct lp_chunk) + m->chunk_size);
+	      c = alloc_page();
 
-	      m->total += m->chunk_size;
+	      m->total += LP_DATA_SIZE;
 	      c->next = NULL;
-	      c->size = m->chunk_size;
 
 	      if (m->current)
 		m->current->next = c;
@@ -145,7 +128,7 @@ lp_alloc(linpool *m, uint size)
 	    }
 	  m->current = c;
 	  m->ptr = c->data + size;
-	  m->end = c->data + m->chunk_size;
+	  m->end = c->data + LP_DATA_SIZE;
 	}
       return c->data;
     }
@@ -207,7 +190,7 @@ lp_flush(linpool *m)
   /* Move ptr to the first chunk and free all large chunks */
   m->current = c = m->first;
   m->ptr = c ? c->data : NULL;
-  m->end = c ? c->data + m->chunk_size : NULL;
+  m->end = c ? c->data + LP_DATA_SIZE : NULL;
 
   while (c = m->first_large)
     {
@@ -230,6 +213,7 @@ lp_save(linpool *m, lp_state *p)
 {
   p->current = m->current;
   p->large = m->first_large;
+  p->total_large = m->total_large;
   p->ptr = m->ptr;
 }
 
@@ -251,12 +235,12 @@ lp_restore(linpool *m, lp_state *p)
   /* Move ptr to the saved pos and free all newer large chunks */
   m->current = c = p->current;
   m->ptr = p->ptr;
-  m->end = c ? c->data + m->chunk_size : NULL;
+  m->end = c ? c->data + LP_DATA_SIZE : NULL;
+  m->total_large = p->total_large;
 
   while ((c = m->first_large) && (c != p->large))
     {
       m->first_large = c->next;
-      m->total_large -= c->size;
       xfree(c);
     }
 }
@@ -270,10 +254,7 @@ lp_free(resource *r)
   for(d=m->first; d; d = c)
     {
       c = d->next;
-      if (m->use_pages)
-	free_page(d);
-      else
-	xfree(d);
+      free_page(d);
     }
   for(d=m->first_large; d; d = c)
     {
@@ -293,9 +274,7 @@ lp_dump(resource *r)
     ;
   for(cntl=0, c=m->first_large; c; c=c->next, cntl++)
     ;
-  debug("(chunk=%d threshold=%d count=%d+%d total=%d+%d)\n",
-	m->chunk_size,
-	m->threshold,
+  debug("(count=%d+%d total=%d+%d)\n",
 	cnt,
 	cntl,
 	m->total,
@@ -308,20 +287,18 @@ lp_memsize(resource *r)
   linpool *m = (linpool *) r;
   struct resmem sz = {
     .overhead = sizeof(struct linpool) + ALLOC_OVERHEAD,
+    .effective = m->total_large,
   };
 
   for (struct lp_chunk *c = m->first_large; c; c = c->next)
-  {
-    sz.effective += c->size;
-    sz.overhead += lp_chunk_size + ALLOC_OVERHEAD;
-  }
+    sz.overhead += sizeof(struct lp_chunk) + ALLOC_OVERHEAD;
 
   uint regular = 0;
   for (struct lp_chunk *c = m->first; c; c = c->next)
     regular++;
 
-  sz.effective += m->chunk_size * regular;
-  sz.overhead += (lp_chunk_size + ALLOC_OVERHEAD) * regular;
+  sz.effective += LP_DATA_SIZE * regular;
+  sz.overhead += (sizeof(struct lp_chunk) + ALLOC_OVERHEAD) * regular;
 
   return sz;
 }
@@ -334,10 +311,7 @@ lp_lookup(resource *r, unsigned long a)
   struct lp_chunk *c;
 
   for(c=m->first; c; c=c->next)
-    if ((unsigned long) c->data <= a && (unsigned long) c->data + c->size > a)
-      return r;
-  for(c=m->first_large; c; c=c->next)
-    if ((unsigned long) c->data <= a && (unsigned long) c->data + c->size > a)
+    if ((unsigned long) c->data <= a && (unsigned long) c->data + LP_DATA_SIZE > a)
       return r;
   return NULL;
 }