From: Pavel Charvat <pchar@ucw.cz>
Date: Tue, 20 May 2014 11:36:32 +0000 (+0200)
Subject: Mempool: Implemented mp_shrink().
X-Git-Tag: v6.0~33
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=4570bd0b9f62747176322900eb0951db9c96f14a;p=libucw.git

Mempool: Implemented mp_shrink().
---

diff --git a/ucw/mempool.c b/ucw/mempool.c
index 9e5d62b0..1048686f 100644
--- a/ucw/mempool.c
+++ b/ucw/mempool.c
@@ -230,6 +230,19 @@ mp_total_size(struct mempool *pool)
   return pool->total_size;
 }
 
+void
+mp_shrink(struct mempool *pool, u64 min_total_size)
+{
+  while (1)
+    {
+      struct mempool_chunk *chunk = pool->unused;
+      if (!chunk || pool->total_size - (chunk->size + MP_CHUNK_TAIL) < min_total_size)
+	break;
+      pool->unused = chunk->next;
+      mp_free_chunk(pool, chunk);
+    }
+}
+
 void *
 mp_alloc_internal(struct mempool *pool, uns size)
 {
diff --git a/ucw/mempool.h b/ucw/mempool.h
index 9427a8ac..b44b955a 100644
--- a/ucw/mempool.h
+++ b/ucw/mempool.h
@@ -137,6 +137,11 @@ void mp_stats(struct mempool *pool, struct mempool_stats *stats);
  **/
 u64 mp_total_size(struct mempool *pool);
 
+/**
+ * Release unused chunks of memory reserved for further allocation
+ * requests, but stop if mp_total_size() would drop below @min_total_size.
+ **/
+void mp_shrink(struct mempool *pool, u64 min_total_size);
 
 /***
  * [[alloc]]