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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] Remove unused old xmalloc.c file.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1224689977 -3600
# Node ID 734a5493f03a9ca31d47adf7a2f78e255e5e9ea9
# Parent 94227875c13d4713b3c44f322663881b5c4ea4a0
Remove unused old xmalloc.c file.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/common/xmalloc.c | 286 ---------------------------------------------------
1 files changed, 286 deletions(-)
diff -r 94227875c13d -r 734a5493f03a xen/common/xmalloc.c
--- a/xen/common/xmalloc.c Wed Oct 22 15:11:54 2008 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,286 +0,0 @@
-/******************************************************************************
- * Simple allocator for Xen. If larger than a page, simply use the
- * page-order allocator.
- *
- * Copyright (C) 2005 Rusty Russell IBM Corporation
- *
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/*
- * TODO (Keir, 17/2/05):
- * 1. Use space in page_info to avoid xmalloc_hdr in allocated blocks.
- * 2. page_info points into free list to make xfree() O(1) complexity.
- * 3. Perhaps make this a sub-page buddy allocator? xmalloc() == O(1).
- * (Disadvantage is potentially greater internal fragmentation).
- */
-
-#include <xen/config.h>
-#include <xen/mm.h>
-#include <xen/spinlock.h>
-#include <xen/timer.h>
-#include <xen/cache.h>
-#include <xen/prefetch.h>
-#include <xen/irq.h>
-#include <xen/smp.h>
-
-/*
- * XMALLOC_DEBUG:
- * 1. Free data blocks are filled with poison bytes.
- * 2. In-use data blocks have guard bytes at the start and end.
- */
-#ifndef NDEBUG
-#define XMALLOC_DEBUG 1
-#endif
-
-static LIST_HEAD(freelist);
-static DEFINE_SPINLOCK(freelist_lock);
-
-struct xmalloc_hdr
-{
- /* Size is total including this header. */
- size_t size;
- struct list_head freelist;
-} __cacheline_aligned;
-
-static void add_to_freelist(struct xmalloc_hdr *hdr)
-{
-#if XMALLOC_DEBUG
- memset(hdr + 1, 0xa5, hdr->size - sizeof(*hdr));
-#endif
- list_add(&hdr->freelist, &freelist);
-}
-
-static void del_from_freelist(struct xmalloc_hdr *hdr)
-{
-#if XMALLOC_DEBUG
- size_t i;
- unsigned char *data = (unsigned char *)(hdr + 1);
- for ( i = 0; i < (hdr->size - sizeof(*hdr)); i++ )
- BUG_ON(data[i] != 0xa5);
- BUG_ON((hdr->size <= 0) || (hdr->size >= PAGE_SIZE));
-#endif
- list_del(&hdr->freelist);
-}
-
-static void *data_from_header(struct xmalloc_hdr *hdr)
-{
-#if XMALLOC_DEBUG
- /* Data block contain SMP_CACHE_BYTES of guard canary. */
- unsigned char *data = (unsigned char *)(hdr + 1);
- memset(data, 0x5a, SMP_CACHE_BYTES);
- memset(data + hdr->size - sizeof(*hdr) - SMP_CACHE_BYTES,
- 0x5a, SMP_CACHE_BYTES);
- return data + SMP_CACHE_BYTES;
-#else
- return hdr + 1;
-#endif
-}
-
-static struct xmalloc_hdr *header_from_data(void *p)
-{
-#if XMALLOC_DEBUG
- unsigned char *data = (unsigned char *)p - SMP_CACHE_BYTES;
- struct xmalloc_hdr *hdr = (struct xmalloc_hdr *)data - 1;
- size_t i;
-
- /* Check header guard canary. */
- for ( i = 0; i < SMP_CACHE_BYTES; i++ )
- BUG_ON(data[i] != 0x5a);
-
- /* Check footer guard canary. */
- data += hdr->size - sizeof(*hdr) - SMP_CACHE_BYTES;
- for ( i = 0; i < SMP_CACHE_BYTES; i++ )
- BUG_ON(data[i] != 0x5a);
-
- return hdr;
-#else
- return (struct xmalloc_hdr *)p - 1;
-#endif
-}
-
-static void maybe_split(struct xmalloc_hdr *hdr, size_t size, size_t block)
-{
- struct xmalloc_hdr *extra;
- size_t leftover = block - size;
-
- /* If enough is left to make a block, put it on free list. */
- if ( leftover >= (2 * sizeof(struct xmalloc_hdr)) )
- {
- extra = (struct xmalloc_hdr *)((unsigned long)hdr + size);
- extra->size = leftover;
- add_to_freelist(extra);
- }
- else
- {
- size = block;
- }
-
- hdr->size = size;
- /* Debugging aid. */
- hdr->freelist.next = hdr->freelist.prev = NULL;
-}
-
-static void *xmalloc_new_page(size_t size)
-{
- struct xmalloc_hdr *hdr;
-
- hdr = alloc_xenheap_page();
- if ( hdr == NULL )
- return NULL;
-
- spin_lock(&freelist_lock);
- maybe_split(hdr, size, PAGE_SIZE);
- spin_unlock(&freelist_lock);
-
- return data_from_header(hdr);
-}
-
-/* Big object? Just use the page allocator. */
-static void *xmalloc_whole_pages(size_t size)
-{
- struct xmalloc_hdr *hdr;
- unsigned int pageorder = get_order_from_bytes(size);
-
- hdr = alloc_xenheap_pages(pageorder);
- if ( hdr == NULL )
- return NULL;
-
- hdr->size = (1 << (pageorder + PAGE_SHIFT));
- /* Debugging aid. */
- hdr->freelist.next = hdr->freelist.prev = NULL;
-
- return data_from_header(hdr);
-}
-
-/* Return size, increased to alignment with align. */
-static inline size_t align_up(size_t size, size_t align)
-{
- return (size + align - 1) & ~(align - 1);
-}
-
-void *_xmalloc(size_t size, size_t align)
-{
- struct xmalloc_hdr *i;
-
- ASSERT(!in_irq());
-
- /* We currently always return cacheline aligned. */
- BUG_ON(align > SMP_CACHE_BYTES);
-
-#if XMALLOC_DEBUG
- /* Add room for canaries at start and end of data block. */
- size += 2 * SMP_CACHE_BYTES;
-#endif
-
- /* Add room for header, pad to align next header. */
- size += sizeof(struct xmalloc_hdr);
- size = align_up(size, __alignof__(struct xmalloc_hdr));
-
- /* For big allocs, give them whole pages. */
- if ( size >= PAGE_SIZE )
- return xmalloc_whole_pages(size);
-
- /* Search free list. */
- spin_lock(&freelist_lock);
- list_for_each_entry( i, &freelist, freelist )
- {
- if ( i->size < size )
- continue;
- del_from_freelist(i);
- maybe_split(i, size, i->size);
- spin_unlock(&freelist_lock);
- return data_from_header(i);
- }
- spin_unlock(&freelist_lock);
-
- /* Alloc a new page and return from that. */
- return xmalloc_new_page(size);
-}
-
-void xfree(void *p)
-{
- struct xmalloc_hdr *i, *tmp, *hdr;
-
- ASSERT(!in_irq());
-
- if ( p == NULL )
- return;
-
- hdr = header_from_data(p);
-
- /* We know hdr will be on same page. */
- BUG_ON(((long)p & PAGE_MASK) != ((long)hdr & PAGE_MASK));
-
- /* Not previously freed. */
- BUG_ON(hdr->freelist.next || hdr->freelist.prev);
-
- /* Big allocs free directly. */
- if ( hdr->size >= PAGE_SIZE )
- {
- free_xenheap_pages(hdr, get_order_from_bytes(hdr->size));
- return;
- }
-
- /* Merge with other free block, or put in list. */
- spin_lock(&freelist_lock);
- list_for_each_entry_safe( i, tmp, &freelist, freelist )
- {
- unsigned long _i = (unsigned long)i;
- unsigned long _hdr = (unsigned long)hdr;
-
- /* Do not merge across page boundaries. */
- if ( ((_i ^ _hdr) & PAGE_MASK) != 0 )
- continue;
-
- /* We follow this block? Swallow it. */
- if ( (_i + i->size) == _hdr )
- {
- del_from_freelist(i);
- i->size += hdr->size;
- hdr = i;
- }
-
- /* We precede this block? Swallow it. */
- if ( (_hdr + hdr->size) == _i )
- {
- del_from_freelist(i);
- hdr->size += i->size;
- }
- }
-
- /* Did we merge an entire page? */
- if ( hdr->size == PAGE_SIZE )
- {
- BUG_ON((((unsigned long)hdr) & (PAGE_SIZE-1)) != 0);
- free_xenheap_pages(hdr, 0);
- }
- else
- {
- add_to_freelist(hdr);
- }
-
- spin_unlock(&freelist_lock);
-}
-
-/*
- * Local variables:
- * mode: C
- * c-set-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
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