mirror of
https://github.com/matrix-construct/construct
synced 2024-11-15 22:41:12 +01:00
ea53aab823
* librb is no longer a separately configured subproject. * charybdis is now a standalone directory with a binary. * Include path layout now requires a directory ircd/ rb/ etc.
308 lines
10 KiB
C
308 lines
10 KiB
C
/*
|
|
* ircd-ratbox: A slightly useful ircd.
|
|
* balloc.c: A block allocator.
|
|
*
|
|
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
|
|
* Copyright (C) 1996-2002 Hybrid Development Team
|
|
* Copyright (C) 2002-2006 ircd-ratbox development team
|
|
*
|
|
* Below are the orignal headers from the old blalloc.c
|
|
*
|
|
* File: blalloc.c
|
|
* Owner: Wohali (Joan Touzet)
|
|
*
|
|
* Modified 2001/11/29 for mmap() support by Aaron Sethman <androsyn@ratbox.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
|
|
* USA
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* About the block allocator
|
|
*
|
|
* Basically we have three ways of getting memory off of the operating
|
|
* system. Below are this list of methods and the order of preference.
|
|
*
|
|
* 1. mmap() anonymous pages with the MMAP_ANON flag.
|
|
* 2. mmap() via the /dev/zero trick.
|
|
* 3. HeapCreate/HeapAlloc (on win32)
|
|
* 4. malloc()
|
|
*
|
|
* The advantages of 1 and 2 are this. We can munmap() the pages which will
|
|
* return the pages back to the operating system, thus reducing the size
|
|
* of the process as the memory is unused. malloc() on many systems just keeps
|
|
* a heap of memory to itself, which never gets given back to the OS, except on
|
|
* exit. This of course is bad, if say we have an event that causes us to allocate
|
|
* say, 200MB of memory, while our normal memory consumption would be 15MB. In the
|
|
* malloc() case, the amount of memory allocated to our process never goes down, as
|
|
* malloc() has it locked up in its heap. With the mmap() method, we can munmap()
|
|
* the block and return it back to the OS, thus causing our memory consumption to go
|
|
* down after we no longer need it.
|
|
*
|
|
*
|
|
*
|
|
*/
|
|
#include <rb/rb.h>
|
|
|
|
static void _rb_bh_fail(const char *reason, const char *file, int line) __attribute__((noreturn));
|
|
|
|
static uintptr_t offset_pad;
|
|
|
|
/* status information for an allocated block in heap */
|
|
struct rb_heap_block
|
|
{
|
|
size_t alloc_size;
|
|
rb_dlink_node node;
|
|
unsigned long free_count;
|
|
void *elems; /* Points to allocated memory */
|
|
};
|
|
typedef struct rb_heap_block rb_heap_block;
|
|
|
|
/* information for the root node of the heap */
|
|
struct rb_bh
|
|
{
|
|
rb_dlink_node hlist;
|
|
size_t elemSize; /* Size of each element to be stored */
|
|
unsigned long elemsPerBlock; /* Number of elements per block */
|
|
rb_dlink_list block_list;
|
|
rb_dlink_list free_list;
|
|
char *desc;
|
|
};
|
|
|
|
static rb_dlink_list *heap_lists;
|
|
|
|
#define rb_bh_fail(x) _rb_bh_fail(x, __FILE__, __LINE__)
|
|
|
|
static void
|
|
_rb_bh_fail(const char *reason, const char *file, int line)
|
|
{
|
|
rb_lib_log("rb_heap_blockheap failure: %s (%s:%d)", reason, file, line);
|
|
abort();
|
|
}
|
|
|
|
/*
|
|
* void rb_init_bh(void)
|
|
*
|
|
* Inputs: None
|
|
* Outputs: None
|
|
* Side Effects: Initializes the block heap
|
|
*/
|
|
|
|
void
|
|
rb_init_bh(void)
|
|
{
|
|
heap_lists = rb_malloc(sizeof(rb_dlink_list));
|
|
offset_pad = sizeof(void *);
|
|
/* XXX if you get SIGBUS when trying to use a long long..here is where you need to
|
|
* fix your shit
|
|
*/
|
|
#ifdef __sparc__
|
|
if((offset_pad % __alignof__(long long)) != 0)
|
|
{
|
|
offset_pad += __alignof__(long long);
|
|
offset_pad &= ~(__alignof__(long long) - 1);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* ************************************************************************ */
|
|
/* FUNCTION DOCUMENTATION: */
|
|
/* rb_bh_create */
|
|
/* Description: */
|
|
/* Creates a new blockheap from which smaller blocks can be allocated. */
|
|
/* Intended to be used instead of multiple calls to malloc() when */
|
|
/* performance is an issue. */
|
|
/* Parameters: */
|
|
/* elemsize (IN): Size of the basic element to be stored */
|
|
/* elemsperblock (IN): Number of elements to be stored in a single block */
|
|
/* of memory. When the blockheap runs out of free memory, it will */
|
|
/* allocate elemsize * elemsperblock more. */
|
|
/* Returns: */
|
|
/* Pointer to new rb_bh, or NULL if unsuccessful */
|
|
/* ************************************************************************ */
|
|
rb_bh *
|
|
rb_bh_create(size_t elemsize, int elemsperblock, const char *desc)
|
|
{
|
|
rb_bh *bh;
|
|
lrb_assert(elemsize > 0 && elemsperblock > 0);
|
|
lrb_assert(elemsize >= sizeof(rb_dlink_node));
|
|
|
|
/* Catch idiotic requests up front */
|
|
if((elemsize == 0) || (elemsperblock <= 0))
|
|
{
|
|
rb_bh_fail("Attempting to rb_bh_create idiotic sizes");
|
|
}
|
|
|
|
if(elemsize < sizeof(rb_dlink_node))
|
|
rb_bh_fail("Attempt to rb_bh_create smaller than sizeof(rb_dlink_node)");
|
|
|
|
/* Allocate our new rb_bh */
|
|
bh = rb_malloc(sizeof(rb_bh));
|
|
bh->elemSize = elemsize;
|
|
bh->elemsPerBlock = elemsperblock;
|
|
if(desc != NULL)
|
|
bh->desc = rb_strdup(desc);
|
|
|
|
if(bh == NULL)
|
|
{
|
|
rb_bh_fail("bh == NULL when it shouldn't be");
|
|
}
|
|
rb_dlinkAdd(bh, &bh->hlist, heap_lists);
|
|
return (bh);
|
|
}
|
|
|
|
/* ************************************************************************ */
|
|
/* FUNCTION DOCUMENTATION: */
|
|
/* rb_bh_alloc */
|
|
/* Description: */
|
|
/* Returns a pointer to a struct within our rb_bh that's free for */
|
|
/* the taking. */
|
|
/* Parameters: */
|
|
/* bh (IN): Pointer to the Blockheap. */
|
|
/* Returns: */
|
|
/* Pointer to a structure (void *), or NULL if unsuccessful. */
|
|
/* ************************************************************************ */
|
|
|
|
void *
|
|
rb_bh_alloc(rb_bh *bh)
|
|
{
|
|
lrb_assert(bh != NULL);
|
|
if(rb_unlikely(bh == NULL))
|
|
{
|
|
rb_bh_fail("Cannot allocate if bh == NULL");
|
|
}
|
|
|
|
return (rb_malloc(bh->elemSize));
|
|
}
|
|
|
|
|
|
/* ************************************************************************ */
|
|
/* FUNCTION DOCUMENTATION: */
|
|
/* rb_bh_free */
|
|
/* Description: */
|
|
/* Returns an element to the free pool, does not free() */
|
|
/* Parameters: */
|
|
/* bh (IN): Pointer to rb_bh containing element */
|
|
/* ptr (in): Pointer to element to be "freed" */
|
|
/* Returns: */
|
|
/* 0 if successful, 1 if element not contained within rb_bh. */
|
|
/* ************************************************************************ */
|
|
int
|
|
rb_bh_free(rb_bh *bh, void *ptr)
|
|
{
|
|
lrb_assert(bh != NULL);
|
|
lrb_assert(ptr != NULL);
|
|
|
|
if(rb_unlikely(bh == NULL))
|
|
{
|
|
rb_lib_log("balloc.c:rb_bhFree() bh == NULL");
|
|
return (1);
|
|
}
|
|
|
|
if(rb_unlikely(ptr == NULL))
|
|
{
|
|
rb_lib_log("balloc.rb_bhFree() ptr == NULL");
|
|
return (1);
|
|
}
|
|
|
|
rb_free(ptr);
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* ************************************************************************ */
|
|
/* FUNCTION DOCUMENTATION: */
|
|
/* rb_bhDestroy */
|
|
/* Description: */
|
|
/* Completely free()s a rb_bh. Use for cleanup. */
|
|
/* Parameters: */
|
|
/* bh (IN): Pointer to the rb_bh to be destroyed. */
|
|
/* Returns: */
|
|
/* 0 if successful, 1 if bh == NULL */
|
|
/* ************************************************************************ */
|
|
int
|
|
rb_bh_destroy(rb_bh *bh)
|
|
{
|
|
if(bh == NULL)
|
|
return (1);
|
|
|
|
rb_dlinkDelete(&bh->hlist, heap_lists);
|
|
rb_free(bh->desc);
|
|
rb_free(bh);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
rb_bh_usage(rb_bh *bh, size_t *bused, size_t *bfree, size_t *bmemusage, const char **desc)
|
|
{
|
|
if(bused != NULL)
|
|
*bused = 0;
|
|
if(bfree != NULL)
|
|
*bfree = 0;
|
|
if(bmemusage != NULL)
|
|
*bmemusage = 0;
|
|
if(desc != NULL)
|
|
*desc = "no blockheap";
|
|
}
|
|
|
|
void
|
|
rb_bh_usage_all(rb_bh_usage_cb *cb, void *data)
|
|
{
|
|
rb_dlink_node *ptr;
|
|
rb_bh *bh;
|
|
size_t used, freem, memusage, heapalloc;
|
|
static const char *unnamed = "(unnamed_heap)";
|
|
const char *desc = unnamed;
|
|
|
|
if(cb == NULL)
|
|
return;
|
|
|
|
RB_DLINK_FOREACH(ptr, heap_lists->head)
|
|
{
|
|
bh = (rb_bh *)ptr->data;
|
|
freem = rb_dlink_list_length(&bh->free_list);
|
|
used = (rb_dlink_list_length(&bh->block_list) * bh->elemsPerBlock) - freem;
|
|
memusage = used * bh->elemSize;
|
|
heapalloc = (freem + used) * bh->elemSize;
|
|
if(bh->desc != NULL)
|
|
desc = bh->desc;
|
|
cb(used, freem, memusage, heapalloc, desc, data);
|
|
}
|
|
return;
|
|
}
|
|
|
|
void
|
|
rb_bh_total_usage(size_t *total_alloc, size_t *total_used)
|
|
{
|
|
rb_dlink_node *ptr;
|
|
size_t total_memory = 0, used_memory = 0, used, freem;
|
|
rb_bh *bh;
|
|
|
|
RB_DLINK_FOREACH(ptr, heap_lists->head)
|
|
{
|
|
bh = (rb_bh *)ptr->data;
|
|
freem = rb_dlink_list_length(&bh->free_list);
|
|
used = (rb_dlink_list_length(&bh->block_list) * bh->elemsPerBlock) - freem;
|
|
used_memory += used * bh->elemSize;
|
|
total_memory += (freem + used) * bh->elemSize;
|
|
}
|
|
|
|
if(total_alloc != NULL)
|
|
*total_alloc = total_memory;
|
|
if(total_used != NULL)
|
|
*total_used = used_memory;
|
|
}
|