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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86 shadow: allocate all shadow memory in single pages
# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxx>
# Date 1283336629 -3600
# Node ID eff592364826a7361b6d72adca596c5ee2331840
# Parent ec9caff0adc6331bbe07581d7953950f1ff4eaeb
x86 shadow: allocate all shadow memory in single pages
now that multi-page shadows need not be contiguous.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
---
xen/arch/x86/mm/shadow/common.c | 346 +++++++++++++---------------------------
xen/arch/x86/mm/shadow/multi.c | 1
xen/include/asm-x86/domain.h | 3
xen/include/asm-x86/mm.h | 7
4 files changed, 120 insertions(+), 237 deletions(-)
diff -r ec9caff0adc6 -r eff592364826 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Wed Sep 01 11:23:48 2010 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Wed Sep 01 11:23:49 2010 +0100
@@ -45,11 +45,8 @@ DEFINE_PER_CPU(uint32_t,trace_shadow_pat
* Called for every domain from arch_domain_create() */
void shadow_domain_init(struct domain *d, unsigned int domcr_flags)
{
- int i;
shadow_lock_init(d);
- for ( i = 0; i <= SHADOW_MAX_ORDER; i++ )
- INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.freelists[i]);
- INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.p2m_freelist);
+ INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.freelist);
INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.pinned_shadows);
/* Use shadow pagetables for log-dirty support */
@@ -1229,11 +1226,6 @@ int shadow_cmpxchg_guest_entry(struct vc
* sl3 size - - - - 4k
* sl4 size - - - - 4k
*
- * We allocate memory from xen in four-page units and break them down
- * with a simple buddy allocator. Can't use the xen allocator to handle
- * this as it only works for contiguous zones, and a domain's shadow
- * pool is made of fragments.
- *
* In HVM guests, the p2m table is built out of shadow pages, and we provide
* a function for the p2m management to steal pages, in max-order chunks, from
* the free pool. We don't provide for giving them back, yet.
@@ -1261,57 +1253,31 @@ static unsigned int shadow_min_acceptabl
return (vcpu_count * 128);
}
-/* Figure out the order of allocation needed for a given shadow type */
+/* Figure out the size (in pages) of a given shadow type */
static inline u32
-shadow_order(unsigned int shadow_type)
-{
- static const u32 type_to_order[SH_type_unused] = {
- 0, /* SH_type_none */
- 1, /* SH_type_l1_32_shadow */
- 1, /* SH_type_fl1_32_shadow */
- 2, /* SH_type_l2_32_shadow */
- 0, /* SH_type_l1_pae_shadow */
- 0, /* SH_type_fl1_pae_shadow */
- 0, /* SH_type_l2_pae_shadow */
- 0, /* SH_type_l2h_pae_shadow */
- 0, /* SH_type_l1_64_shadow */
- 0, /* SH_type_fl1_64_shadow */
- 0, /* SH_type_l2_64_shadow */
- 0, /* SH_type_l2h_64_shadow */
- 0, /* SH_type_l3_64_shadow */
- 0, /* SH_type_l4_64_shadow */
- 2, /* SH_type_p2m_table */
- 0, /* SH_type_monitor_table */
- 0 /* SH_type_oos_snapshot */
+shadow_size(unsigned int shadow_type)
+{
+ static const u32 type_to_size[SH_type_unused] = {
+ 1, /* SH_type_none */
+ 2, /* SH_type_l1_32_shadow */
+ 2, /* SH_type_fl1_32_shadow */
+ 4, /* SH_type_l2_32_shadow */
+ 1, /* SH_type_l1_pae_shadow */
+ 1, /* SH_type_fl1_pae_shadow */
+ 1, /* SH_type_l2_pae_shadow */
+ 1, /* SH_type_l2h_pae_shadow */
+ 1, /* SH_type_l1_64_shadow */
+ 1, /* SH_type_fl1_64_shadow */
+ 1, /* SH_type_l2_64_shadow */
+ 1, /* SH_type_l2h_64_shadow */
+ 1, /* SH_type_l3_64_shadow */
+ 1, /* SH_type_l4_64_shadow */
+ 1, /* SH_type_p2m_table */
+ 1, /* SH_type_monitor_table */
+ 1 /* SH_type_oos_snapshot */
};
ASSERT(shadow_type < SH_type_unused);
- return type_to_order[shadow_type];
-}
-
-static inline unsigned int
-shadow_max_order(struct domain *d)
-{
- return is_hvm_domain(d) ? SHADOW_MAX_ORDER : 0;
-}
-
-/* Do we have at total of count pages of the requested order free? */
-static inline int space_is_available(
- struct domain *d,
- unsigned int order,
- unsigned int count)
-{
- for ( ; order <= shadow_max_order(d); ++order )
- {
- unsigned int n = count;
- const struct page_info *sp;
-
- page_list_for_each ( sp, &d->arch.paging.shadow.freelists[order] )
- if ( --n == 0 )
- return 1;
- count = (count + 1) >> 1;
- }
-
- return 0;
+ return type_to_size[shadow_type];
}
/* Dispatcher function: call the per-mode function that will unhook the
@@ -1357,8 +1323,7 @@ static inline void trace_shadow_prealloc
* available in the shadow page pool. */
static void _shadow_prealloc(
struct domain *d,
- unsigned int order,
- unsigned int count)
+ unsigned int pages)
{
/* Need a vpcu for calling unpins; for now, since we don't have
* per-vcpu shadows, any will do */
@@ -1367,8 +1332,7 @@ static void _shadow_prealloc(
mfn_t smfn;
int i;
- ASSERT(order <= shadow_max_order(d));
- if ( space_is_available(d, order, count) ) return;
+ if ( d->arch.paging.shadow.free_pages >= pages ) return;
v = current;
if ( v->domain != d )
@@ -1386,7 +1350,7 @@ static void _shadow_prealloc(
sh_unpin(v, smfn);
/* See if that freed up enough space */
- if ( space_is_available(d, order, count) ) return;
+ if ( d->arch.paging.shadow.free_pages >= pages ) return;
}
/* Stage two: all shadow pages are in use in hierarchies that are
@@ -1404,7 +1368,7 @@ static void _shadow_prealloc(
pagetable_get_mfn(v2->arch.shadow_table[i]), 0);
/* See if that freed up enough space */
- if ( space_is_available(d, order, count) )
+ if ( d->arch.paging.shadow.free_pages >= pages )
{
flush_tlb_mask(&d->domain_dirty_cpumask);
return;
@@ -1414,9 +1378,9 @@ static void _shadow_prealloc(
/* Nothing more we can do: all remaining shadows are of pages that
* hold Xen mappings for some vcpu. This can never happen. */
- SHADOW_ERROR("Can't pre-allocate %u order-%u shadow pages!\n"
+ SHADOW_ERROR("Can't pre-allocate %u shadow pages!\n"
" shadow pages total = %u, free = %u, p2m=%u\n",
- count, order,
+ pages,
d->arch.paging.shadow.total_pages,
d->arch.paging.shadow.free_pages,
d->arch.paging.shadow.p2m_pages);
@@ -1430,7 +1394,7 @@ static void _shadow_prealloc(
* to avoid freeing shadows that the caller is currently working on. */
void shadow_prealloc(struct domain *d, u32 type, unsigned int count)
{
- return _shadow_prealloc(d, shadow_order(type), count);
+ return _shadow_prealloc(d, shadow_size(type) * count);
}
/* Deliberately free all the memory we can: this will tear down all of
@@ -1506,6 +1470,7 @@ __initcall(shadow_blow_tables_keyhandler
__initcall(shadow_blow_tables_keyhandler_init);
#endif /* !NDEBUG */
+/* Accessors for the singly-linked list that's used for hash chains */
static inline struct page_info *
next_shadow(const struct page_info *sp)
{
@@ -1526,42 +1491,29 @@ mfn_t shadow_alloc(struct domain *d,
unsigned long backpointer)
{
struct page_info *sp = NULL;
- unsigned int order = shadow_order(shadow_type);
+ unsigned int pages = shadow_size(shadow_type);
struct page_list_head tmp_list;
cpumask_t mask;
void *p;
int i;
ASSERT(shadow_locked_by_me(d));
- if (shadow_type == SH_type_p2m_table && order > shadow_max_order(d))
- order = shadow_max_order(d);
- ASSERT(order <= shadow_max_order(d));
ASSERT(shadow_type != SH_type_none);
perfc_incr(shadow_alloc);
- /* Find smallest order which can satisfy the request. */
- for ( i = order; i <= SHADOW_MAX_ORDER; i++ )
- if ( (sp = page_list_remove_head(&d->arch.paging.shadow.freelists[i]))
)
- goto found;
-
- /* If we get here, we failed to allocate. This should never happen.
- * It means that we didn't call shadow_prealloc() correctly before
- * we allocated. We can't recover by calling prealloc here, because
- * we might free up higher-level pages that the caller is working on. */
- SHADOW_ERROR("Can't allocate %i shadow pages!\n", 1 << order);
- BUG();
-
- found:
- /* We may have to halve the chunk a number of times. */
- while ( i != order )
- {
- i--;
- sp->v.free.order = i;
- page_list_add_tail(sp, &d->arch.paging.shadow.freelists[i]);
- sp += 1 << i;
- }
- d->arch.paging.shadow.free_pages -= 1 << order;
-
+ if ( d->arch.paging.shadow.free_pages < pages )
+ {
+ /* If we get here, we failed to allocate. This should never
+ * happen. It means that we didn't call shadow_prealloc()
+ * correctly before we allocated. We can't recover by calling
+ * prealloc here, because we might free up higher-level pages
+ * that the caller is working on. */
+ SHADOW_ERROR("Can't allocate %i shadow pages!\n", pages);
+ BUG();
+ }
+ d->arch.paging.shadow.free_pages -= pages;
+
+ /* Backpointers that are MFNs need to be packed into PDXs (PFNs don't) */
switch (shadow_type)
{
case SH_type_fl1_32_shadow:
@@ -1579,34 +1531,36 @@ mfn_t shadow_alloc(struct domain *d,
INIT_PAGE_LIST_HEAD(&tmp_list);
/* Init page info fields and clear the pages */
- for ( i = 0; i < 1<<order ; i++ )
- {
+ for ( i = 0; i < pages ; i++ )
+ {
+ sp = page_list_remove_head(&d->arch.paging.shadow.freelist);
/* Before we overwrite the old contents of this page,
* we need to be sure that no TLB holds a pointer to it. */
mask = d->domain_dirty_cpumask;
- tlbflush_filter(mask, sp[i].tlbflush_timestamp);
+ tlbflush_filter(mask, sp->tlbflush_timestamp);
if ( unlikely(!cpus_empty(mask)) )
{
perfc_incr(shadow_alloc_tlbflush);
flush_tlb_mask(&mask);
}
/* Now safe to clear the page for reuse */
- p = __map_domain_page(sp+i);
+ p = __map_domain_page(sp);
ASSERT(p != NULL);
clear_page(p);
sh_unmap_domain_page(p);
- INIT_PAGE_LIST_ENTRY(&sp[i].list);
- sp[i].u.sh.type = shadow_type;
- sp[i].u.sh.pinned = 0;
- sp[i].u.sh.count = 0;
- sp[i].u.sh.head = ( shadow_type >= SH_type_min_shadow
- && shadow_type <= SH_type_max_shadow
- && i == 0 );
- sp[i].v.sh.back = backpointer;
- set_next_shadow(&sp[i], NULL);
- page_list_add_tail(&sp[i], &tmp_list);
+ INIT_PAGE_LIST_ENTRY(&sp->list);
+ page_list_add(sp, &tmp_list);
+ sp->u.sh.type = shadow_type;
+ sp->u.sh.pinned = 0;
+ sp->u.sh.count = 0;
+ sp->u.sh.head = 0;
+ sp->v.sh.back = backpointer;
+ set_next_shadow(sp, NULL);
perfc_incr(shadow_alloc_count);
}
+ if ( shadow_type >= SH_type_min_shadow
+ && shadow_type <= SH_type_max_shadow )
+ sp->u.sh.head = 1;
return page_to_mfn(sp);
}
@@ -1614,10 +1568,9 @@ mfn_t shadow_alloc(struct domain *d,
/* Return some shadow pages to the pool. */
void shadow_free(struct domain *d, mfn_t smfn)
{
- struct page_info *sp = mfn_to_page(smfn);
+ struct page_info *next = NULL, *sp = mfn_to_page(smfn);
+ unsigned int pages;
u32 shadow_type;
- unsigned long order;
- unsigned long mask;
int i;
ASSERT(shadow_locked_by_me(d));
@@ -1627,11 +1580,9 @@ void shadow_free(struct domain *d, mfn_t
ASSERT(shadow_type != SH_type_none);
ASSERT(shadow_type != SH_type_p2m_table);
ASSERT(sp->u.sh.head || (shadow_type > SH_type_max_shadow));
- order = shadow_order(shadow_type);
-
- d->arch.paging.shadow.free_pages += 1 << order;
-
- for ( i = 0; i < 1<<order; i++ )
+ pages = shadow_size(shadow_type);
+
+ for ( i = 0; i < pages; i++ )
{
#if SHADOW_OPTIMIZATIONS & (SHOPT_WRITABLE_HEURISTIC | SHOPT_FAST_EMULATION)
struct vcpu *v;
@@ -1639,7 +1590,8 @@ void shadow_free(struct domain *d, mfn_t
{
#if SHADOW_OPTIMIZATIONS & SHOPT_WRITABLE_HEURISTIC
/* No longer safe to look for a writeable mapping in this shadow */
- if ( v->arch.paging.shadow.last_writeable_pte_smfn == mfn_x(smfn)
+ i )
+ if ( v->arch.paging.shadow.last_writeable_pte_smfn
+ == mfn_x(page_to_mfn(sp)) )
v->arch.paging.shadow.last_writeable_pte_smfn = 0;
#endif
#if SHADOW_OPTIMIZATIONS & SHOPT_FAST_EMULATION
@@ -1647,108 +1599,57 @@ void shadow_free(struct domain *d, mfn_t
#endif
}
#endif
+ /* Get the next page before we overwrite the list header */
+ if ( i < pages - 1 )
+ next = pdx_to_page(sp->list.next);
/* Strip out the type: this is now a free shadow page */
- sp[i].u.sh.type = sp[i].u.sh.head = 0;
+ sp->u.sh.type = sp->u.sh.head = 0;
/* Remember the TLB timestamp so we will know whether to flush
* TLBs when we reuse the page. Because the destructors leave the
* contents of the pages in place, we can delay TLB flushes until
* just before the allocator hands the page out again. */
- sp[i].tlbflush_timestamp = tlbflush_current_time();
+ sp->tlbflush_timestamp = tlbflush_current_time();
perfc_decr(shadow_alloc_count);
- }
-
- /* Merge chunks as far as possible. */
- for ( ; order < shadow_max_order(d); ++order )
- {
- mask = 1 << order;
- if ( (mfn_x(page_to_mfn(sp)) & mask) ) {
- /* Merge with predecessor block? */
- if ( ((sp-mask)->u.sh.type != PGT_none) ||
- ((sp-mask)->v.free.order != order) )
- break;
- sp -= mask;
- page_list_del(sp, &d->arch.paging.shadow.freelists[order]);
- } else {
- /* Merge with successor block? */
- if ( ((sp+mask)->u.sh.type != PGT_none) ||
- ((sp+mask)->v.free.order != order) )
- break;
- page_list_del(sp + mask, &d->arch.paging.shadow.freelists[order]);
- }
- }
-
- sp->v.free.order = order;
- page_list_add_tail(sp, &d->arch.paging.shadow.freelists[order]);
-}
-
-/* Divert some memory from the pool to be used by the p2m mapping.
+ page_list_add_tail(sp, &d->arch.paging.shadow.freelist);
+ sp = next;
+ }
+
+ d->arch.paging.shadow.free_pages += pages;
+}
+
+/* Divert a page from the pool to be used by the p2m mapping.
* This action is irreversible: the p2m mapping only ever grows.
* That's OK because the p2m table only exists for translated domains,
- * and those domains can't ever turn off shadow mode.
- * Also, we only ever allocate a max-order chunk, so as to preserve
- * the invariant that shadow_prealloc() always works.
- * Returns 0 iff it can't get a chunk (the caller should then
- * free up some pages in domheap and call sh_set_allocation);
- * returns non-zero on success.
- */
-static int
-sh_alloc_p2m_pages(struct domain *d)
-{
+ * and those domains can't ever turn off shadow mode. */
+static struct page_info *
+shadow_alloc_p2m_page(struct p2m_domain *p2m)
+{
+ struct domain *d = p2m->domain;
struct page_info *pg;
- u32 i;
- unsigned int order = shadow_max_order(d);
-
- ASSERT(shadow_locked_by_me(d));
+ shadow_lock(d);
+
if ( d->arch.paging.shadow.total_pages
- < (shadow_min_acceptable_pages(d) + (1 << order)) )
- return 0; /* Not enough shadow memory: need to increase it first */
-
+ < shadow_min_acceptable_pages(d) + 1 )
+ {
+ shadow_unlock(d);
+ return NULL;
+ }
+
shadow_prealloc(d, SH_type_p2m_table, 1);
pg = mfn_to_page(shadow_alloc(d, SH_type_p2m_table, 0));
- d->arch.paging.shadow.p2m_pages += (1 << order);
- d->arch.paging.shadow.total_pages -= (1 << order);
- for (i = 0; i < (1U << order); i++)
- {
- /* Unlike shadow pages, mark p2m pages as owned by the domain.
- * Marking the domain as the owner would normally allow the guest to
- * create mappings of these pages, but these p2m pages will never be
- * in the domain's guest-physical address space, and so that is not
- * believed to be a concern.
- */
- page_set_owner(&pg[i], d);
- pg[i].count_info |= 1;
- page_list_add_tail(&pg[i], &d->arch.paging.shadow.p2m_freelist);
- }
- return 1;
-}
-
-// Returns 0 if no memory is available...
-static struct page_info *
-shadow_alloc_p2m_page(struct p2m_domain *p2m)
-{
- struct domain *d = p2m->domain;
- struct page_info *pg;
- mfn_t mfn;
- void *p;
-
- shadow_lock(d);
-
- if ( page_list_empty(&d->arch.paging.shadow.p2m_freelist) &&
- !sh_alloc_p2m_pages(d) )
- {
- shadow_unlock(d);
- return NULL;
- }
- pg = page_list_remove_head(&d->arch.paging.shadow.p2m_freelist);
shadow_unlock(d);
- mfn = page_to_mfn(pg);
- p = sh_map_domain_page(mfn);
- clear_page(p);
- sh_unmap_domain_page(p);
-
+ /* Unlike shadow pages, mark p2m pages as owned by the domain.
+ * Marking the domain as the owner would normally allow the guest to
+ * create mappings of these pages, but these p2m pages will never be
+ * in the domain's guest-physical address space, and so that is not
+ * believed to be a concern. */
+ page_set_owner(pg, d);
+ pg->count_info |= 1;
+ d->arch.paging.shadow.p2m_pages++;
+ d->arch.paging.shadow.total_pages--;
return pg;
}
@@ -1827,7 +1728,6 @@ static unsigned int sh_set_allocation(st
{
struct page_info *sp;
unsigned int lower_bound;
- unsigned int j, order = shadow_max_order(d);
ASSERT(shadow_locked_by_me(d));
@@ -1844,9 +1744,6 @@ static unsigned int sh_set_allocation(st
lower_bound = shadow_min_acceptable_pages(d) + (d->tot_pages / 256);
if ( pages < lower_bound )
pages = lower_bound;
-
- /* Round up to largest block size */
- pages = (pages + ((1<<SHADOW_MAX_ORDER)-1)) &
~((1<<SHADOW_MAX_ORDER)-1);
}
SHADOW_PRINTK("current %i target %i\n",
@@ -1858,39 +1755,34 @@ static unsigned int sh_set_allocation(st
{
/* Need to allocate more memory from domheap */
sp = (struct page_info *)
- alloc_domheap_pages(NULL, order, MEMF_node(domain_to_node(d)));
+ alloc_domheap_page(NULL, MEMF_node(domain_to_node(d)));
if ( sp == NULL )
{
SHADOW_PRINTK("failed to allocate shadow pages.\n");
return -ENOMEM;
}
- d->arch.paging.shadow.free_pages += 1 << order;
- d->arch.paging.shadow.total_pages += 1 << order;
- for ( j = 0; j < 1U << order; j++ )
- {
- sp[j].u.sh.type = 0;
- sp[j].u.sh.pinned = 0;
- sp[j].u.sh.count = 0;
- sp[j].tlbflush_timestamp = 0; /* Not in any TLB */
- }
- sp->v.free.order = order;
- page_list_add_tail(sp, &d->arch.paging.shadow.freelists[order]);
+ d->arch.paging.shadow.free_pages++;
+ d->arch.paging.shadow.total_pages++;
+ sp->u.sh.type = 0;
+ sp->u.sh.pinned = 0;
+ sp->u.sh.count = 0;
+ sp->tlbflush_timestamp = 0; /* Not in any TLB */
+ page_list_add_tail(sp, &d->arch.paging.shadow.freelist);
}
else if ( d->arch.paging.shadow.total_pages > pages )
{
/* Need to return memory to domheap */
- _shadow_prealloc(d, order, 1);
- sp =
page_list_remove_head(&d->arch.paging.shadow.freelists[order]);
+ _shadow_prealloc(d, 1);
+ sp = page_list_remove_head(&d->arch.paging.shadow.freelist);
ASSERT(sp);
/*
* The pages were allocated anonymously, but the owner field
* gets overwritten normally, so need to clear it here.
*/
- for ( j = 0; j < 1U << order; j++ )
- page_set_owner(&((struct page_info *)sp)[j], NULL);
- d->arch.paging.shadow.free_pages -= 1 << order;
- d->arch.paging.shadow.total_pages -= 1 << order;
- free_domheap_pages((struct page_info *)sp, order);
+ page_set_owner(sp, NULL);
+ d->arch.paging.shadow.free_pages--;
+ d->arch.paging.shadow.total_pages--;
+ free_domheap_page(sp);
}
/* Check to see if we need to yield and try again */
@@ -3223,7 +3115,6 @@ void shadow_teardown(struct domain *d)
{
struct vcpu *v;
mfn_t mfn;
- struct page_info *pg;
struct p2m_domain *p2m = p2m_get_hostp2m(d);
ASSERT(d->is_dying);
@@ -3277,9 +3168,6 @@ void shadow_teardown(struct domain *d)
#endif /* OOS */
}
#endif /* (SHADOW_OPTIMIZATIONS & (SHOPT_VIRTUAL_TLB|SHOPT_OUT_OF_SYNC)) */
-
- while ( (pg = page_list_remove_head(&d->arch.paging.shadow.p2m_freelist)) )
- shadow_free_p2m_page(p2m, pg);
if ( d->arch.paging.shadow.total_pages != 0 )
{
diff -r ec9caff0adc6 -r eff592364826 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Wed Sep 01 11:23:48 2010 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c Wed Sep 01 11:23:49 2010 +0100
@@ -437,7 +437,6 @@ static inline mfn_t sh_next_page(mfn_t s
next = _mfn(pdx_to_pfn(pg->list.next));
- /* XXX not for long */ ASSERT(mfn_x(next) == mfn_x(smfn) + 1);
ASSERT(mfn_to_page(next)->u.sh.type == pg->u.sh.type);
ASSERT(!mfn_to_page(next)->u.sh.head);
return next;
diff -r ec9caff0adc6 -r eff592364826 xen/include/asm-x86/domain.h
--- a/xen/include/asm-x86/domain.h Wed Sep 01 11:23:48 2010 +0100
+++ b/xen/include/asm-x86/domain.h Wed Sep 01 11:23:49 2010 +0100
@@ -97,8 +97,7 @@ struct shadow_domain {
struct page_list_head pinned_shadows;
/* Memory allocation */
- struct page_list_head freelists[SHADOW_MAX_ORDER + 1];
- struct page_list_head p2m_freelist;
+ struct page_list_head freelist;
unsigned int total_pages; /* number of pages allocated */
unsigned int free_pages; /* number of pages on freelists */
unsigned int p2m_pages; /* number of pages allocates to p2m */
diff -r ec9caff0adc6 -r eff592364826 xen/include/asm-x86/mm.h
--- a/xen/include/asm-x86/mm.h Wed Sep 01 11:23:48 2010 +0100
+++ b/xen/include/asm-x86/mm.h Wed Sep 01 11:23:49 2010 +0100
@@ -35,7 +35,7 @@ struct page_info
union {
/* Each frame can be threaded onto a doubly-linked list.
*
- * For unused shadow pages, a list of pages of this order;
+ * For unused shadow pages, a list of free shadow pages;
* for multi-page shadows, links to the other pages in this shadow;
* for pinnable shadows, if pinned, a list of all pinned shadows
* (see sh_type_is_pinnable() for the definition of "pinnable"
@@ -94,7 +94,7 @@ struct page_info
__pdx_t back;
} sh;
- /* Page is on a free list (including shadow code free lists). */
+ /* Page is on a free list. */
struct {
/* Order-size of the free chunk this page is the head of. */
unsigned int order;
@@ -259,9 +259,6 @@ struct spage_info
#define PRtype_info "016lx"/* should only be used for printk's */
#endif
-/* The order of the largest allocation unit we use for shadow pages */
-#define SHADOW_MAX_ORDER 2 /* Need up to 16k allocs for 32-bit on PAE/64 */
-
/* The number of out-of-sync shadows we allow per vcpu (prime, please) */
#define SHADOW_OOS_PAGES 3
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