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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] Replace boot-time free-pages bitmap with a region list.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1247087311 -3600
# Node ID d6c1d7992f437c625135c2f8752fc94078ec4c31
# Parent ef38784f9f85ba8db24af84c345b33da08970b13
Replace boot-time free-pages bitmap with a region list.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/ia64/xen/xenmem.c | 6 -
xen/arch/ia64/xen/xensetup.c | 4
xen/arch/x86/mm.c | 2
xen/arch/x86/setup.c | 17 +-
xen/arch/x86/tboot.c | 7 -
xen/arch/x86/x86_64/mm.c | 1
xen/common/kexec.c | 1
xen/common/page_alloc.c | 253 ++++++++++++++++---------------------------
xen/include/asm-x86/mm.h | 10 -
xen/include/xen/mm.h | 5
10 files changed, 110 insertions(+), 196 deletions(-)
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/ia64/xen/xenmem.c
--- a/xen/arch/ia64/xen/xenmem.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/ia64/xen/xenmem.c Wed Jul 08 22:08:31 2009 +0100
@@ -87,8 +87,6 @@ alloc_dir_page(void)
{
unsigned long mfn = alloc_boot_pages(1, 1);
unsigned long dir;
- if (!mfn)
- panic("Not enough memory for virtual frame table!\n");
++table_size;
dir = mfn << PAGE_SHIFT;
clear_page(__va(dir));
@@ -101,8 +99,6 @@ alloc_table_page(unsigned long fill)
unsigned long mfn = alloc_boot_pages(1, 1);
unsigned long *table;
unsigned long i;
- if (!mfn)
- panic("Not enough memory for virtual frame table!\n");
++table_size;
table = (unsigned long *)__va((mfn << PAGE_SHIFT));
for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++)
@@ -245,8 +241,6 @@ void __init init_frametable(void)
* address is identity mapped */
pfn = alloc_boot_pages(
frame_table_size >> PAGE_SHIFT, FT_ALIGN_SIZE >> PAGE_SHIFT);
- if (pfn == 0)
- panic("Not enough memory for frame table.\n");
frame_table = __va(pfn << PAGE_SHIFT);
memset(frame_table, 0, frame_table_size);
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/ia64/xen/xensetup.c
--- a/xen/arch/ia64/xen/xensetup.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/ia64/xen/xensetup.c Wed Jul 08 22:08:31 2009 +0100
@@ -514,9 +514,7 @@ skip_move:
efi_print();
xen_heap_start = memguard_init(ia64_imva(&_end));
- printk("Before xen_heap_start: %p\n", xen_heap_start);
- xen_heap_start = __va(init_boot_allocator(__pa(xen_heap_start)));
- printk("After xen_heap_start: %p\n", xen_heap_start);
+ printk("xen_heap_start: %p\n", xen_heap_start);
efi_memmap_walk(filter_rsvd_memory, init_boot_pages);
efi_memmap_walk(xen_count_pages, &nr_pages);
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/x86/mm.c Wed Jul 08 22:08:31 2009 +0100
@@ -199,8 +199,6 @@ void __init init_frametable(void)
while (nr_pages + 4 - i < page_step)
page_step >>= PAGETABLE_ORDER;
mfn = alloc_boot_pages(page_step, page_step);
- if ( mfn == 0 )
- panic("Not enough memory for frame table\n");
map_pages_to_xen(
FRAMETABLE_VIRT_START + (i << PAGE_SHIFT),
mfn, page_step, PAGE_HYPERVISOR);
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/x86/setup.c Wed Jul 08 22:08:31 2009 +0100
@@ -97,7 +97,6 @@ cpumask_t cpu_present_map;
cpumask_t cpu_present_map;
unsigned long xen_phys_start;
-unsigned long allocator_bitmap_end;
#ifdef CONFIG_X86_32
/* Limits of Xen heap, used to initialise the allocator. */
@@ -764,24 +763,21 @@ void __init __start_xen(unsigned long mb
EARLY_FAIL("Not enough memory to relocate the dom0 kernel image.\n");
reserve_e820_ram(&boot_e820, initial_images_base, initial_images_end);
- /* Initialise boot heap. */
- allocator_bitmap_end = init_boot_allocator(__pa(&_end));
#if defined(CONFIG_X86_32)
- xenheap_initial_phys_start = allocator_bitmap_end;
+ xenheap_initial_phys_start = __pa(&_end);
xenheap_phys_end = DIRECTMAP_MBYTES << 20;
#else
if ( !xen_phys_start )
EARLY_FAIL("Not enough memory to relocate Xen.\n");
- reserve_e820_ram(&boot_e820, __pa(&_start), allocator_bitmap_end);
+ reserve_e820_ram(&boot_e820, __pa(&_start), __pa(&_end));
#endif
/* Late kexec reservation (dynamic start address). */
kexec_reserve_area(&boot_e820);
/*
- * With the boot allocator now initialised, we can walk every RAM region
- * and map it in its entirety (on x86/64, at least) and notify it to the
- * boot allocator.
+ * Walk every RAM region and map it in its entirety (on x86/64, at least)
+ * and notify it to the boot allocator.
*/
for ( i = 0; i < boot_e820.nr_map; i++ )
{
@@ -1132,7 +1128,6 @@ int xen_in_range(paddr_t start, paddr_t
if ( !xen_regions[0].s )
{
extern char __init_begin[], __bss_start[];
- extern unsigned long allocator_bitmap_end;
/* S3 resume code (and other real mode trampoline code) */
xen_regions[0].s = bootsym_phys(trampoline_start);
@@ -1144,9 +1139,9 @@ int xen_in_range(paddr_t start, paddr_t
xen_regions[2].s = __pa(&__per_cpu_start);
xen_regions[2].e = xen_regions[2].s +
(((paddr_t)last_cpu(cpu_possible_map) + 1) << PERCPU_SHIFT);
- /* bss + boot allocator bitmap */
+ /* bss */
xen_regions[3].s = __pa(&__bss_start);
- xen_regions[3].e = allocator_bitmap_end;
+ xen_regions[3].e = __pa(&_end);
}
for ( i = 0; i < ARRAY_SIZE(xen_regions); i++ )
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/x86/tboot.c
--- a/xen/arch/x86/tboot.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/x86/tboot.c Wed Jul 08 22:08:31 2009 +0100
@@ -47,7 +47,6 @@ static uint64_t sinit_base, sinit_size;
#define TXTCR_HEAP_SIZE 0x0308
extern char __init_begin[], __per_cpu_start[], __bss_start[];
-extern unsigned long allocator_bitmap_end;
#define SHA1_SIZE 20
typedef uint8_t sha1_hash_t[SHA1_SIZE];
@@ -299,7 +298,7 @@ void tboot_shutdown(uint32_t shutdown_ty
/*
* Xen regions for tboot to MAC
*/
- g_tboot_shared->num_mac_regions = 5;
+ g_tboot_shared->num_mac_regions = 4;
/* S3 resume code (and other real mode trampoline code) */
g_tboot_shared->mac_regions[0].start = bootsym_phys(trampoline_start);
g_tboot_shared->mac_regions[0].size = bootsym_phys(trampoline_end) -
@@ -315,10 +314,6 @@ void tboot_shutdown(uint32_t shutdown_ty
/* bss */
g_tboot_shared->mac_regions[3].start = (uint64_t)__pa(&__bss_start);
g_tboot_shared->mac_regions[3].size = __pa(&_end) - __pa(&__bss_start);
- /* boot allocator bitmap */
- g_tboot_shared->mac_regions[4].start = (uint64_t)__pa(&_end);
- g_tboot_shared->mac_regions[4].size = allocator_bitmap_end -
- __pa(&_end);
/*
* MAC domains and other Xen memory
diff -r ef38784f9f85 -r d6c1d7992f43 xen/arch/x86/x86_64/mm.c
--- a/xen/arch/x86/x86_64/mm.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/arch/x86/x86_64/mm.c Wed Jul 08 22:08:31 2009 +0100
@@ -68,7 +68,6 @@ void *alloc_xen_pagetable(void)
}
mfn = alloc_boot_pages(1, 1);
- BUG_ON(mfn == 0);
return mfn_to_virt(mfn);
}
diff -r ef38784f9f85 -r d6c1d7992f43 xen/common/kexec.c
--- a/xen/common/kexec.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/common/kexec.c Wed Jul 08 22:08:31 2009 +0100
@@ -334,7 +334,6 @@ static void crash_save_vmcoreinfo(void)
VMCOREINFO_SYMBOL(domain_list);
VMCOREINFO_SYMBOL(frame_table);
- VMCOREINFO_SYMBOL(alloc_bitmap);
VMCOREINFO_SYMBOL(max_page);
VMCOREINFO_STRUCT_SIZE(page_info);
diff -r ef38784f9f85 -r d6c1d7992f43 xen/common/page_alloc.c
--- a/xen/common/page_alloc.c Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/common/page_alloc.c Wed Jul 08 22:08:31 2009 +0100
@@ -69,117 +69,78 @@ PAGE_LIST_HEAD(page_offlined_list);
/* Broken page list, protected by heap_lock. */
PAGE_LIST_HEAD(page_broken_list);
-/*********************
- * ALLOCATION BITMAP
- * One bit per page of memory. Bit set => page is allocated.
- */
-
-unsigned long *alloc_bitmap;
-#define PAGES_PER_MAPWORD (sizeof(unsigned long) * 8)
-
-#define allocated_in_map(_pn) \
-({ unsigned long ___pn = (_pn); \
- !!(alloc_bitmap[___pn/PAGES_PER_MAPWORD] & \
- (1UL<<(___pn&(PAGES_PER_MAPWORD-1)))); })
-
-/*
- * Hint regarding bitwise arithmetic in map_{alloc,free}:
- * -(1<<n) sets all bits >= n.
- * (1<<n)-1 sets all bits < n.
- * Variable names in map_{alloc,free}:
- * *_idx == Index into `alloc_bitmap' array.
- * *_off == Bit offset within an element of the `alloc_bitmap' array.
- */
-
-static void map_alloc(unsigned long first_page, unsigned long nr_pages)
-{
- unsigned long start_off, end_off, curr_idx, end_idx;
-
-#ifndef NDEBUG
- unsigned long i;
- /* Check that the block isn't already allocated. */
- for ( i = 0; i < nr_pages; i++ )
- ASSERT(!allocated_in_map(first_page + i));
-#endif
-
- curr_idx = first_page / PAGES_PER_MAPWORD;
- start_off = first_page & (PAGES_PER_MAPWORD-1);
- end_idx = (first_page + nr_pages) / PAGES_PER_MAPWORD;
- end_off = (first_page + nr_pages) & (PAGES_PER_MAPWORD-1);
-
- if ( curr_idx == end_idx )
- {
- alloc_bitmap[curr_idx] |= ((1UL<<end_off)-1) & -(1UL<<start_off);
- }
- else
- {
- alloc_bitmap[curr_idx] |= -(1UL<<start_off);
- while ( ++curr_idx < end_idx ) alloc_bitmap[curr_idx] = ~0UL;
- alloc_bitmap[curr_idx] |= (1UL<<end_off)-1;
- }
-}
-
-static void map_free(unsigned long first_page, unsigned long nr_pages)
-{
- unsigned long start_off, end_off, curr_idx, end_idx;
-
-#ifndef NDEBUG
- unsigned long i;
- /* Check that the block isn't already freed. */
- for ( i = 0; i < nr_pages; i++ )
- ASSERT(allocated_in_map(first_page + i));
-#endif
-
- curr_idx = first_page / PAGES_PER_MAPWORD;
- start_off = first_page & (PAGES_PER_MAPWORD-1);
- end_idx = (first_page + nr_pages) / PAGES_PER_MAPWORD;
- end_off = (first_page + nr_pages) & (PAGES_PER_MAPWORD-1);
-
- if ( curr_idx == end_idx )
- {
- alloc_bitmap[curr_idx] &= -(1UL<<end_off) | ((1UL<<start_off)-1);
- }
- else
- {
- alloc_bitmap[curr_idx] &= (1UL<<start_off)-1;
- while ( ++curr_idx != end_idx ) alloc_bitmap[curr_idx] = 0;
- alloc_bitmap[curr_idx] &= -(1UL<<end_off);
- }
-}
-
-
-
/*************************
* BOOT-TIME ALLOCATOR
*/
-static unsigned long first_valid_mfn = ~0UL;
-
-/* Initialise allocator to handle up to @max_page pages. */
-paddr_t __init init_boot_allocator(paddr_t bitmap_start)
-{
- unsigned long bitmap_size;
-
- bitmap_start = round_pgup(bitmap_start);
-
- /*
- * Allocate space for the allocation bitmap. Include an extra longword
- * of padding for possible overrun in map_alloc and map_free.
- */
- bitmap_size = max_page / 8;
- bitmap_size += sizeof(unsigned long);
- bitmap_size = round_pgup(bitmap_size);
- alloc_bitmap = (unsigned long *)maddr_to_virt(bitmap_start);
-
- /* All allocated by default. */
- memset(alloc_bitmap, ~0, bitmap_size);
-
- return bitmap_start + bitmap_size;
+static unsigned long __initdata first_valid_mfn = ~0UL;
+
+static struct bootmem_region {
+ unsigned long s, e; /* MFNs @s through @e-1 inclusive are free */
+} *__initdata bootmem_region_list;
+static unsigned int __initdata nr_bootmem_regions;
+
+static void __init boot_bug(int line)
+{
+ panic("Boot BUG at %s:%d\n", __FILE__, line);
+}
+#define BOOT_BUG_ON(p) if ( p ) boot_bug(__LINE__);
+
+static void __init bootmem_region_add(unsigned long s, unsigned long e)
+{
+ unsigned int i;
+
+ if ( (bootmem_region_list == NULL) && (s < e) )
+ bootmem_region_list = mfn_to_virt(s++);
+
+ if ( s >= e )
+ return;
+
+ for ( i = 0; i < nr_bootmem_regions; i++ )
+ if ( s < bootmem_region_list[i].e )
+ break;
+
+ BOOT_BUG_ON((i < nr_bootmem_regions) && (e > bootmem_region_list[i].s));
+ BOOT_BUG_ON(nr_bootmem_regions ==
+ (PAGE_SIZE / sizeof(struct bootmem_region)));
+
+ memmove(&bootmem_region_list[i+1], &bootmem_region_list[i],
+ (nr_bootmem_regions - i) * sizeof(*bootmem_region_list));
+ bootmem_region_list[i] = (struct bootmem_region) { s, e };
+ nr_bootmem_regions++;
+}
+
+static void __init bootmem_region_zap(unsigned long s, unsigned long e)
+{
+ unsigned int i;
+
+ for ( i = 0; i < nr_bootmem_regions; i++ )
+ {
+ struct bootmem_region *r = &bootmem_region_list[i];
+ if ( e <= r->s )
+ break;
+ if ( s >= r->e )
+ continue;
+ if ( s <= r->s )
+ {
+ r->s = min(e, r->e);
+ }
+ else if ( e >= r->e )
+ {
+ r->e = s;
+ }
+ else
+ {
+ unsigned long _e = r->e;
+ r->e = s;
+ bootmem_region_add(e, _e);
+ }
+ }
}
void __init init_boot_pages(paddr_t ps, paddr_t pe)
{
- unsigned long bad_spfn, bad_epfn, i;
+ unsigned long bad_spfn, bad_epfn;
const char *p;
ps = round_pgup(ps);
@@ -189,7 +150,7 @@ void __init init_boot_pages(paddr_t ps,
first_valid_mfn = min_t(unsigned long, ps >> PAGE_SHIFT, first_valid_mfn);
- map_free(ps >> PAGE_SHIFT, (pe - ps) >> PAGE_SHIFT);
+ bootmem_region_add(ps >> PAGE_SHIFT, pe >> PAGE_SHIFT);
/* Check new pages against the bad-page list. */
p = opt_badpage;
@@ -217,32 +178,29 @@ void __init init_boot_pages(paddr_t ps,
printk("Marking pages %lx through %lx as bad\n",
bad_spfn, bad_epfn);
- for ( i = bad_spfn; i <= bad_epfn; i++ )
- if ( (i < max_page) && !allocated_in_map(i) )
- map_alloc(i, 1);
+ bootmem_region_zap(bad_spfn, bad_epfn+1);
}
}
unsigned long __init alloc_boot_pages(
unsigned long nr_pfns, unsigned long pfn_align)
{
- unsigned long pg, i;
-
- /* Search backwards to obtain highest available range. */
- for ( pg = (max_page - nr_pfns) & ~(pfn_align - 1);
- pg >= first_valid_mfn;
- pg = (pg + i - nr_pfns) & ~(pfn_align - 1) )
- {
- for ( i = 0; i < nr_pfns; i++ )
- if ( allocated_in_map(pg+i) )
- break;
- if ( i == nr_pfns )
- {
- map_alloc(pg, nr_pfns);
- return pg;
- }
- }
-
+ unsigned long pg, _e;
+ int i;
+
+ for ( i = nr_bootmem_regions - 1; i >= 0; i-- )
+ {
+ struct bootmem_region *r = &bootmem_region_list[i];
+ pg = (r->e - nr_pfns) & ~(pfn_align - 1);
+ if ( pg < r->s )
+ continue;
+ _e = r->e;
+ r->e = pg;
+ bootmem_region_add(pg + nr_pfns, _e);
+ return pg;
+ }
+
+ BOOT_BUG_ON(1);
return 0;
}
@@ -660,12 +618,7 @@ int offline_page(unsigned long mfn, int
*status = 0;
pg = mfn_to_page(mfn);
-#if defined(__x86_64__)
- /* Xen's txt mfn in x86_64 is reserved in e820 */
if ( is_xen_fixed_mfn(mfn) )
-#elif defined(__i386__)
- if ( is_xen_heap_mfn(mfn) )
-#endif
{
*status = PG_OFFLINE_XENPAGE | PG_OFFLINE_FAILED |
(DOMID_XEN << PG_OFFLINE_OWNER_SHIFT);
@@ -673,14 +626,14 @@ int offline_page(unsigned long mfn, int
}
/*
- * N.B. xen's txt in x86_64 is marked reserved and handled already
- * Also kexec range is reserved
+ * N.B. xen's txt in x86_64 is marked reserved and handled already.
+ * Also kexec range is reserved.
*/
- if ( !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
- {
+ if ( !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
+ {
*status = PG_OFFLINE_FAILED | PG_OFFLINE_NOT_CONV_RAM;
return -EINVAL;
- }
+ }
spin_lock(&heap_lock);
@@ -703,7 +656,7 @@ int offline_page(unsigned long mfn, int
/* Release the reference since it will not be allocated anymore */
put_page(pg);
}
- else if ( old_info & PGC_xen_heap)
+ else if ( old_info & PGC_xen_heap )
{
*status = PG_OFFLINE_XENPAGE | PG_OFFLINE_PENDING |
(DOMID_XEN << PG_OFFLINE_OWNER_SHIFT);
@@ -880,31 +833,18 @@ static unsigned long avail_heap_pages(
return free_pages;
}
-#define avail_for_domheap(mfn) !(allocated_in_map(mfn) || is_xen_heap_mfn(mfn))
void __init end_boot_allocator(void)
{
- unsigned long i, nr = 0;
- int curr_free, next_free;
+ unsigned int i;
/* Pages that are free now go to the domain sub-allocator. */
- if ( (curr_free = next_free = avail_for_domheap(first_valid_mfn)) )
- map_alloc(first_valid_mfn, 1);
- for ( i = first_valid_mfn; i < max_page; i++ )
- {
- curr_free = next_free;
- next_free = avail_for_domheap(i+1);
- if ( next_free )
- map_alloc(i+1, 1); /* prevent merging in free_heap_pages() */
- if ( curr_free )
- ++nr;
- else if ( nr )
- {
- init_heap_pages(mfn_to_page(i - nr), nr);
- nr = 0;
- }
- }
- if ( nr )
- init_heap_pages(mfn_to_page(i - nr), nr);
+ for ( i = 0; i < nr_bootmem_regions; i++ )
+ {
+ struct bootmem_region *r = &bootmem_region_list[i];
+ if ( r->s < r->e )
+ init_heap_pages(mfn_to_page(r->s), r->e - r->s);
+ }
+ init_heap_pages(virt_to_page(bootmem_region_list), 1);
if ( !dma_bitsize && (num_online_nodes() > 1) )
{
@@ -923,7 +863,6 @@ void __init end_boot_allocator(void)
printk(" DMA width %u bits", dma_bitsize);
printk("\n");
}
-#undef avail_for_domheap
/*
* Scrub all unallocated pages in all heap zones. This function is more
diff -r ef38784f9f85 -r d6c1d7992f43 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/include/asm-x86/mm.h Wed Jul 08 22:08:31 2009 +0100
@@ -219,14 +219,14 @@ struct page_info
unsigned long _mfn = (mfn); \
(_mfn < paddr_to_pfn(xenheap_phys_end)); \
})
-#else
-extern unsigned long allocator_bitmap_end;
+#define is_xen_fixed_mfn(mfn) is_xen_heap_mfn(mfn)
+#else
#define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
#define is_xen_heap_mfn(mfn) \
(__mfn_valid(mfn) && is_xen_heap_page(__mfn_to_page(mfn)))
-#define is_xen_fixed_mfn(mfn) \
- ( (mfn << PAGE_SHIFT) >= __pa(&_start) && \
- (mfn << PAGE_SHIFT) <= allocator_bitmap_end )
+#define is_xen_fixed_mfn(mfn) \
+ ((((mfn) << PAGE_SHIFT) >= __pa(&_start)) && \
+ (((mfn) << PAGE_SHIFT) <= __pa(&_end)))
#endif
#if defined(__i386__)
diff -r ef38784f9f85 -r d6c1d7992f43 xen/include/xen/mm.h
--- a/xen/include/xen/mm.h Wed Jul 08 16:47:58 2009 +0100
+++ b/xen/include/xen/mm.h Wed Jul 08 22:08:31 2009 +0100
@@ -37,7 +37,6 @@ struct page_info;
struct page_info;
/* Boot-time allocator. Turns into generic allocator after bootstrap. */
-paddr_t init_boot_allocator(paddr_t bitmap_start);
void init_boot_pages(paddr_t ps, paddr_t pe);
unsigned long alloc_boot_pages(
unsigned long nr_pfns, unsigned long pfn_align);
@@ -307,9 +306,7 @@ int guest_remove_page(struct domain *d,
#define RAM_TYPE_RESERVED 0x00000002
#define RAM_TYPE_UNUSABLE 0x00000004
#define RAM_TYPE_ACPI 0x00000008
-/* Returns TRUE if the whole page at @mfn is of the requested RAM type(s)
above. */
+/* TRUE if the whole page at @mfn is of the requested RAM type(s) above. */
int page_is_ram_type(unsigned long mfn, unsigned long mem_type);
-extern unsigned long *alloc_bitmap; /* for vmcoreinfo */
-
#endif /* __XEN_MM_H__ */
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