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/* -*- linux-c -*-
* Memory allocation functions
* Copyright (C) 2005, 2006, 2007 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _ALLOC_C_
#define _ALLOC_C_
/* counters of how much memory has been allocated */
static int _stp_allocated_memory = 0;
static int _stp_allocated_net_memory = 0;
#define STP_ALLOC_FLAGS (GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN)
static void *_stp_kmalloc(size_t size)
{
void *ret = kmalloc(size, STP_ALLOC_FLAGS);
if (ret)
_stp_allocated_memory += size;
return ret;
}
static void *_stp_kzalloc(size_t size)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
{
void *ret = kmalloc(size, STP_ALLOC_FLAGS);
if (ret) {
memset (ret, 0, size);
_stp_allocated_memory += size;
}
return ret;
}
#else
{
void *ret = kzalloc(size, STP_ALLOC_FLAGS);
if (ret)
_stp_allocated_memory += size;
return ret;
}
#endif
static void *_stp_vmalloc(unsigned long size)
{
void *ret = __vmalloc(size, STP_ALLOC_FLAGS, PAGE_KERNEL);
if (ret)
_stp_allocated_memory += size;
return ret;
}
/* This file exists because all the NUMA-compatible allocators keep
changing in 2.6 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
#define kmalloc_node(size,flags,node) kmalloc(size,flags)
#endif /* LINUX_VERSION_CODE */
#ifdef CONFIG_SMP
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
#define _stp_alloc_percpu(size) __alloc_percpu(size, 8)
#define _stp_free_percpu(ptr) free_percpu(ptr)
#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15) */
/* This is like alloc_percpu() except it simply takes a size, instead of a type. */
void *_stp_alloc_percpu(size_t size)
{
int i;
struct percpu_data *pdata = kmalloc(sizeof (*pdata), STP_ALLOC_FLAGS);
if (!pdata)
return NULL;
for_each_cpu(i) {
int node = cpu_to_node(i);
if (node_online(node))
pdata->ptrs[i] = kmalloc_node(size, STP_ALLOC_FLAGS, node);
else
pdata->ptrs[i] = kmalloc(size, STP_ALLOC_FLAGS);
if (!pdata->ptrs[i])
goto unwind_oom;
_stp_allocated_memory += size;
memset(pdata->ptrs[i], 0, size);
}
/* Catch derefs w/o wrappers */
return (void *) (~(unsigned long) pdata);
unwind_oom:
while (--i >= 0) {
if (!cpu_possible(i))
continue;
kfree(pdata->ptrs[i]);
}
kfree(pdata);
return NULL;
}
void _stp_free_percpu(const void *objp)
{
int i;
struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
for_each_cpu(i)
kfree(p->ptrs[i]);
kfree(p);
}
#endif /* LINUX_VERSION_CODE */
#else /* CONFIG_SMP */
#define _stp_free_percpu(ptr) kfree(ptr)
void *_stp_alloc_percpu(size_t size)
{
void *ret = kmalloc(size, STP_ALLOC_FLAGS);
if (ret)
memset(ret, 0, size);
return ret;
}
#endif /* CONFIG_SMP */
#endif /* _ALLOC_C_ */
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