From 07317eb3cbeec4684d0fbc8d3193ac8135d363e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Vavru=C5=A1a?= <marek.vavrusa@nic.cz>
Date: Wed, 2 Apr 2014 12:23:52 +0200
Subject: [PATCH] mempool: partial import of bigalloc.c to use mempools in
mmap'ed mode
http://www.ucw.cz/gitweb/?p=libucw.git;a=blob;f=ucw/bigalloc.c;hb=HEAD
---
src/common/mempool.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/src/common/mempool.c b/src/common/mempool.c
index 082806afe4..cda8e6e3df 100644
--- a/src/common/mempool.c
+++ b/src/common/mempool.c
@@ -21,6 +21,7 @@
/** \todo This shouldn't be precalculated, but computed on load. */
#define CPU_PAGE_SIZE 4096
+
/** Align an integer @s to the nearest higher multiple of @a (which should be a power of two) **/
#define ALIGN_TO(s, a) (((s)+a-1)&~(a-1))
#define MP_CHUNK_TAIL ALIGN_TO(sizeof(struct mempool_chunk), CPU_STRUCT_ALIGN)
@@ -31,6 +32,33 @@
#endif
#define DBG(s...)
+/** \note Imported MMAP backend from bigalloc.c */
+#define CONFIG_UCW_POOL_IS_MMAP
+#ifdef CONFIG_UCW_POOL_IS_MMAP
+#include <sys/mman.h>
+static void *
+page_alloc(uint64_t len)
+{
+ if (!len)
+ return NULL;
+ if (len > SIZE_MAX)
+ return NULL;
+ assert(!(len & (CPU_PAGE_SIZE-1)));
+ uint8_t *p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (p == (uint8_t*) MAP_FAILED)
+ return NULL;
+ return p;
+}
+
+static void
+page_free(void *start, uint64_t len)
+{
+ assert(!(len & (CPU_PAGE_SIZE-1)));
+ assert(!((uintptr_t) start & (CPU_PAGE_SIZE-1)));
+ munmap(start, len);
+}
+#endif
+
struct mempool_chunk {
struct mempool_chunk *next;
unsigned size;
--
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