Merge branch 'slub-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm
Merge commit. Changes below are compared with the first parent: c8b6de16.
Changes
6 files changed · +457 −63
| File | Status | Add | Del | Content |
|---|---|---|---|---|
| Documentation/vm/slabinfo.c | modified | +138 | −11 | View file |
| arch/x86/Kconfig | modified | +4 | −0 | View file |
| include/linux/mm_types.h | modified | +4 | −1 | View file |
| include/linux/slub_def.h | modified | +23 | −0 | View file |
| lib/Kconfig.debug | modified | +13 | −0 | View file |
| mm/slub.c | modified | +275 | −51 | View file |
Only the first 600 diff lines are shown. Download the complete patch.
Documentation/vm/slabinfo.c
View filediff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c
index 488c1f3..7123fee 100644
--- a/Documentation/vm/slabinfo.c
+++ b/Documentation/vm/slabinfo.c
@@ -32,6 +32,13 @@ struct slabinfo {
int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
unsigned long partial, objects, slabs;
+ unsigned long alloc_fastpath, alloc_slowpath;
+ unsigned long free_fastpath, free_slowpath;
+ unsigned long free_frozen, free_add_partial, free_remove_partial;
+ unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
+ unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
+ unsigned long deactivate_to_head, deactivate_to_tail;
+ unsigned long deactivate_remote_frees;
int numa[MAX_NODES];
int numa_partial[MAX_NODES];
} slabinfo[MAX_SLABS];
@@ -64,8 +71,10 @@ int show_inverted = 0;
int show_single_ref = 0;
int show_totals = 0;
int sort_size = 0;
+int sort_active = 0;
int set_debug = 0;
int show_ops = 0;
+int show_activity = 0;
/* Debug options */
int sanity = 0;
@@ -93,8 +102,10 @@ void usage(void)
printf("slabinfo 5/7/2007. (c) 2007 sgi. [email protected]\n\n"
"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
+ "-A|--activity Most active slabs first\n"
"-d<options>|--debug=<options> Set/Clear Debug options\n"
- "-e|--empty Show empty slabs\n"
+ "-D|--display-active Switch line format to activity\n"
+ "-e|--empty Show empty slabs\n"
"-f|--first-alias Show first alias\n"
"-h|--help Show usage information\n"
"-i|--inverted Inverted list\n"
@@ -281,8 +292,11 @@ int line = 0;
void first_line(void)
{
- printf("Name Objects Objsize Space "
- "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
+ if (show_activity)
+ printf("Name Objects Alloc Free %%Fast\n");
+ else
+ printf("Name Objects Objsize Space "
+ "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
}
/*
@@ -309,6 +323,12 @@ unsigned long slab_size(struct slabinfo *s)
return s->slabs * (page_size << s->order);
}
+unsigned long slab_activity(struct slabinfo *s)
+{
+ return s->alloc_fastpath + s->free_fastpath +
+ s->alloc_slowpath + s->free_slowpath;
+}
+
void slab_numa(struct slabinfo *s, int mode)
{
int node;
@@ -392,6 +412,71 @@ const char *onoff(int x)
return "Off";
}
+void slab_stats(struct slabinfo *s)
+{
+ unsigned long total_alloc;
+ unsigned long total_free;
+ unsigned long total;
+
+ if (!s->alloc_slab)
+ return;
+
+ total_alloc = s->alloc_fastpath + s->alloc_slowpath;
+ total_free = s->free_fastpath + s->free_slowpath;
+
+ if (!total_alloc)
+ return;
+
+ printf("\n");
+ printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
+ printf("--------------------------------------------------\n");
+ printf("Fastpath %8lu %8lu %3lu %3lu\n",
+ s->alloc_fastpath, s->free_fastpath,
+ s->alloc_fastpath * 100 / total_alloc,
+ s->free_fastpath * 100 / total_free);
+ printf("Slowpath %8lu %8lu %3lu %3lu\n",
+ total_alloc - s->alloc_fastpath, s->free_slowpath,
+ (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
+ s->free_slowpath * 100 / total_free);
+ printf("Page Alloc %8lu %8lu %3lu %3lu\n",
+ s->alloc_slab, s->free_slab,
+ s->alloc_slab * 100 / total_alloc,
+ s->free_slab * 100 / total_free);
+ printf("Add partial %8lu %8lu %3lu %3lu\n",
+ s->deactivate_to_head + s->deactivate_to_tail,
+ s->free_add_partial,
+ (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
+ s->free_add_partial * 100 / total_free);
+ printf("Remove partial %8lu %8lu %3lu %3lu\n",
+ s->alloc_from_partial, s->free_remove_partial,
+ s->alloc_from_partial * 100 / total_alloc,
+ s->free_remove_partial * 100 / total_free);
+
+ printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
+ s->deactivate_remote_frees, s->free_frozen,
+ s->deactivate_remote_frees * 100 / total_alloc,
+ s->free_frozen * 100 / total_free);
+
+ printf("Total %8lu %8lu\n\n", total_alloc, total_free);
+
+ if (s->cpuslab_flush)
+ printf("Flushes %8lu\n", s->cpuslab_flush);
+
+ if (s->alloc_refill)
+ printf("Refill %8lu\n", s->alloc_refill);
+
+ total = s->deactivate_full + s->deactivate_empty +
+ s->deactivate_to_head + s->deactivate_to_tail;
+
+ if (total)
+ printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
+ "ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
+ s->deactivate_full, (s->deactivate_full * 100) / total,
+ s->deactivate_empty, (s->deactivate_empty * 100) / total,
+ s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
+ s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
+}
+
void report(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
@@ -430,6 +515,7 @@ void report(struct slabinfo *s)
ops(s);
show_tracking(s);
slab_numa(s, 1);
+ slab_stats(s);
}
void slabcache(struct slabinfo *s)
@@ -479,13 +565,27 @@ void slabcache(struct slabinfo *s)
*p++ = 'T';
*p = 0;
- printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
- s->name, s->objects, s->object_size, size_str, dist_str,
- s->objs_per_slab, s->order,
- s->slabs ? (s->partial * 100) / s->slabs : 100,
- s->slabs ? (s->objects * s->object_size * 100) /
- (s->slabs * (page_size << s->order)) : 100,
- flags);
+ if (show_activity) {
+ unsigned long total_alloc;
+ unsigned long total_free;
+
+ total_alloc = s->alloc_fastpath + s->alloc_slowpath;
+ total_free = s->free_fastpath + s->free_slowpath;
+
+ printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
+ s->name, s->objects,
+ total_alloc, total_free,
+ total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
+ total_free ? (s->free_fastpath * 100 / total_free) : 0);
+ }
+ else
+ printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
+ s->name, s->objects, s->object_size, size_str, dist_str,
+ s->objs_per_slab, s->order,
+ s->slabs ? (s->partial * 100) / s->slabs : 100,
+ s->slabs ? (s->objects * s->object_size * 100) /
+ (s->slabs * (page_size << s->order)) : 100,
+ flags);
}
/*
@@ -892,6 +992,8 @@ void sort_slabs(void)
if (sort_size)
result = slab_size(s1) < slab_size(s2);
+ else if (sort_active)
+ result = slab_activity(s1) < slab_activity(s2);
else
result = strcasecmp(s1->name, s2->name);
@@ -1074,6 +1176,23 @@ void read_slab_dir(void)
free(t);
slab->store_user = get_obj("store_user");
slab->trace = get_obj("trace");
+ slab->alloc_fastpath = get_obj("alloc_fastpath");
+ slab->alloc_slowpath = get_obj("alloc_slowpath");
+ slab->free_fastpath = get_obj("free_fastpath");
+ slab->free_slowpath = get_obj("free_slowpath");
+ slab->free_frozen= get_obj("free_frozen");
+ slab->free_add_partial = get_obj("free_add_partial");
+ slab->free_remove_partial = get_obj("free_remove_partial");
+ slab->alloc_from_partial = get_obj("alloc_from_partial");
+ slab->alloc_slab = get_obj("alloc_slab");
+ slab->alloc_refill = get_obj("alloc_refill");
+ slab->free_slab = get_obj("free_slab");
+ slab->cpuslab_flush = get_obj("cpuslab_flush");
+ slab->deactivate_full = get_obj("deactivate_full");
+ slab->deactivate_empty = get_obj("deactivate_empty");
+ slab->deactivate_to_head = get_obj("deactivate_to_head");
+ slab->deactivate_to_tail = get_obj("deactivate_to_tail");
+ slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
chdir("..");
if (slab->name[0] == ':')
alias_targets++;
@@ -1124,7 +1243,9 @@ void output_slabs(void)
struct option opts[] = {
{ "aliases", 0, NULL, 'a' },
+ { "activity", 0, NULL, 'A' },
{ "debug", 2, NULL, 'd' },
+ { "display-activity", 0, NULL, 'D' },
{ "empty", 0, NULL, 'e' },
{ "first-alias", 0, NULL, 'f' },
{ "help", 0, NULL, 'h' },
@@ -1149,7 +1270,7 @@ int main(int argc, char *argv[])
page_size = getpagesize();
- while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
+ while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1158,11 +1279,17 @@ int main(int argc, char *argv[])
case 'a':
show_alias = 1;
break;
+ case 'A':
+ sort_active = 1;
+ break;
case 'd':
set_debug = 1;
if (!debug_opt_scan(optarg))
fatal("Invalid debug option '%s'\n", optarg);
break;
+ case 'D':
+ show_activity = 1;
+ break;
case 'e':
show_empty = 1;
break;
arch/x86/Kconfig
View filediff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c95482b..9d0aced 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -52,6 +52,10 @@ config HAVE_LATENCYTOP_SUPPORT
config SEMAPHORE_SLEEPERS
def_bool y
+config FAST_CMPXCHG_LOCAL
+ bool
+ default y
+
config MMU
def_bool y
include/linux/mm_types.h
View filediff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 34023c6..bfee0bd 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -64,7 +64,10 @@ struct page {
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
spinlock_t ptl;
#endif
- struct kmem_cache *slab; /* SLUB: Pointer to slab */
+ struct {
+ struct kmem_cache *slab; /* SLUB: Pointer to slab */
+ void *end; /* SLUB: end marker */
+ };
struct page *first_page; /* Compound tail pages */
};
union {
include/linux/slub_def.h
View filediff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index ddb1a70..5e6d3d6 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -11,12 +11,35 @@
#include <linux/workqueue.h>
#include <linux/kobject.h>
+enum stat_item {
+ ALLOC_FASTPATH, /* Allocation from cpu slab */
+ ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
+ FREE_FASTPATH, /* Free to cpu slub */
+ FREE_SLOWPATH, /* Freeing not to cpu slab */
+ FREE_FROZEN, /* Freeing to frozen slab */
+ FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
+ FREE_REMOVE_PARTIAL, /* Freeing removes last object */
+ ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
+ ALLOC_SLAB, /* Cpu slab acquired from page allocator */
+ ALLOC_REFILL, /* Refill cpu slab from slab freelist */
+ FREE_SLAB, /* Slab freed to the page allocator */
+ CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
+ DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
+ DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
+ DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
+ DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
+ DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
+ NR_SLUB_STAT_ITEMS };
+
struct kmem_cache_cpu {
void **freelist; /* Pointer to first free per cpu object */
struct page *page; /* The slab from which we are allocating */
int node; /* The node of the page (or -1 for debug) */
unsigned int offset; /* Freepointer offset (in word units) */
unsigned int objsize; /* Size of an object (from kmem_cache) */
+#ifdef CONFIG_SLUB_STATS
+ unsigned stat[NR_SLUB_STAT_ITEMS];
+#endif
};
struct kmem_cache_node {
lib/Kconfig.debug
View filediff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 0d385be..4f4008f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -205,6 +205,19 @@ config SLUB_DEBUG_ON
off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
"slub_debug=-".
+config SLUB_STATS
+ default n
+ bool "Enable SLUB performance statistics"
+ depends on SLUB
+ help
+ SLUB statistics are useful to debug SLUBs allocation behavior in
+ order find ways to optimize the allocator. This should never be
+ enabled for production use since keeping statistics slows down
+ the allocator by a few percentage points. The slabinfo command
+ supports the determination of the most active slabs to figure
+ out which slabs are relevant to a particular load.
+ Try running: slabinfo -DA
+
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
mm/slub.c
View filediff --git a/mm/slub.c b/mm/slub.c
index 3f05667..e2989ae 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -149,6 +149,13 @@ static inline void ClearSlabDebug(struct page *page)
/* Enable to test recovery from slab corruption on boot */
#undef SLUB_RESILIENCY_TEST
+/*
+ * Currently fastpath is not supported if preemption is enabled.
+ */
+#if defined(CONFIG_FAST_CMPXCHG_LOCAL) && !defined(CONFIG_PREEMPT)
+#define SLUB_FASTPATH
+#endif
+
#if PAGE_SHIFT <= 12
/*
@@ -243,6 +250,7 @@ enum track_item { TRACK_ALLOC, TRACK_FREE };
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
static void sysfs_slab_remove(struct kmem_cache *);
+
#else
static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
@@ -251,8 +259,16 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
{
kfree(s);
}
+
#endif
+static inline void stat(struct kmem_cache_cpu *c, enum stat_item si)
+{
+#ifdef CONFIG_SLUB_STATS
+ c->stat[si]++;
+#endif
+}
+
/********************************************************************
* Core slab cache functions
*******************************************************************/
@@ -280,15 +296,32 @@ static inline struct kmem_cache_cpu *get_cpu_slab(struct kmem_cache *s, int cpu)
#endif
}
+/*
+ * The end pointer in a slab is special. It points to the first object in the
+ * slab but has bit 0 set to mark it.
+ *
+ * Note that SLUB relies on page_mapping returning NULL for pages with bit 0
+ * in the mapping set.
+ */
+static inline int is_end(void *addr)
+{
+ return (unsigned long)addr & PAGE_MAPPING_ANON;
+}
+
+void *slab_address(struct page *page)
+{
+ return page->end - PAGE_MAPPING_ANON;
+}
+
static inline int check_valid_pointer(struct kmem_cache *s,
struct page *page, const void *object)
{
void *base;
- if (!object)
+ if (object == page->end)
return 1;
- base = page_address(page);
+ base = slab_address(page);
if (object < base || object >= base + s->objects * s->size ||
(object - base) % s->size) {
return 0;
@@ -321,7 +354,8 @@ static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
/* Scan freelist */
#define for_each_free_object(__p, __s, __free) \
- for (__p = (__free); __p; __p = get_freepointer((__s), __p))
+ for (__p = (__free); (__p) != page->end; __p = get_freepointer((__s),\
+ __p))
/* Determine object index from a given position */
static inline int slab_index(void *p, struct kmem_cache *s, void *addr)
@@ -473,7 +507,7 @@ static void slab_fix(struct kmem_cache *s, char *fmt, ...)
static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
{
unsigned int off; /* Offset of last byte */
- u8 *addr = page_address(page);
+ u8 *addr = slab_address(page);
print_tracking(s, p);
@@ -651,7 +685,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
if (!(s->flags & SLAB_POISON))
return 1;
- start = page_address(page);
+ start = slab_address(page);
end = start + (PAGE_SIZE << s->order);
length = s->objects * s->size;
remainder = end - (start + length);
@@ -685,9 +719,10 @@ static int check_object(struct kmem_cache *s, struct page *page,
endobject, red, s->inuse - s->objsize))
return 0;
} else {
- if ((s->flags & SLAB_POISON) && s->objsize < s->inuse)
- check_bytes_and_report(s, page, p, "Alignment padding", endobject,
- POISON_INUSE, s->inuse - s->objsize);
+ if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) {
+ check_bytes_and_report(s, page, p, "Alignment padding",
+ endobject, POISON_INUSE, s->inuse - s->objsize);
+ }
}
if (s->flags & SLAB_POISON) {
@@ -718,7 +753,7 @@ static int check_object(struct kmem_cache *s, struct page *page,
* of the free objects in this slab. May cause
* another error because the object count is now wrong.
*/
- set_freepointer(s, p, NULL);
+ set_freepointer(s, p, page->end);
return 0;
}
return 1;
@@ -752,18 +787,18 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
void *fp = page->freelist;
void *object = NULL;
- while (fp && nr <= s->objects) {
+ while (fp != page->end && nr <= s->objects) {
if (fp == search)
return 1;
if (!check_valid_pointer(s, page, fp)) {
if (object) {
object_err(s, page, object,
"Freechain corrupt");
- set_freepointer(s, object, NULL);
+ set_freepointer(s, object, page->end);
break;
} else {
slab_err(s, page, "Freepointer corrupt");
- page->freelist = NULL;
+ page->freelist = page->end;
page->inuse = s->objects;
slab_fix(s, "Freelist cleared");
return 0;
@@ -869,7 +904,7 @@ bad:
*/
slab_fix(s, "Marking all objects used");
page->inuse = s->objects;
- page->freelist = NULL;
+ page->freelist = page->end;
}
return 0;
}
@@ -894,11 +929,10 @@ static int free_debug_processing(struct kmem_cache *s, struct page *page,
return 0;
if (unlikely(s != page->slab)) {
- if (!PageSlab(page))
+ if (!PageSlab(page)) {
slab_err(s, page, "Attempt to free object(0x%p) "
"outside of slab", object);
- else
- if (!page->slab) {
+ } else if (!page->slab) {
printk(KERN_ERR
"SLUB <none>: no slab for object 0x%p.\n",
object);
@@ -910,7 +944,7 @@ static int free_debug_processing(struct kmem_cache *s, struct page *page,
}
/* Special debug activities for freeing objects */
- if (!SlabFrozen(page) && !page->freelist)
+ if (!SlabFrozen(page) && page->freelist == page->end)
remove_full(s, page);
if (s->flags & SLAB_STORE_USER)
set_track(s, object, TRACK_FREE, addr);
@@ -1007,7 +1041,7 @@ static unsigned long kmem_cache_flags(unsigned long objsize,
*/
if (slub_debug && (!slub_debug_slabs ||
strncmp(slub_debug_slabs, name,
- strlen(slub_debug_slabs)) == 0))
+ strlen(slub_debug_slabs)) == 0))
flags |= slub_debug;
}
@@ -1102,6 +1136,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
SetSlabDebug(page);
start = page_address(page);
+ page->end = start + 1;
if (unlikely(s->flags & SLAB_POISON))
memset(start, POISON_INUSE, PAGE_SIZE << s->order);
@@ -1113,7 +1148,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
last = p;
}
setup_object(s, page, last);
- set_freepointer(s, last, NULL);
+ set_freepointer(s, last, page->end);
page->freelist = start;
page->inuse = 0;
@@ -1129,7 +1164,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
void *p;
slab_pad_check(s, page);
- for_each_object(p, s, page_address(page))
+ for_each_object(p, s, slab_address(page))
check_object(s, page, p, 0);
ClearSlabDebug(page);
}
@@ -1139,6 +1174,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
-pages);
+ page->mapping = NULL;
__free_pages(page, s->order);
}
@@ -1183,7 +1219,7 @@ static __always_inline void slab_lock(struct page *page)
static __always_inline void slab_unlock(struct page *page)
{
- bit_spin_unlock(PG_locked, &page->flags);
+ __bit_spin_unlock(PG_locked, &page->flags);
}
static __always_inline int slab_trylock(struct page *page)
@@ -1294,8 +1330,8 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
get_cycles() % 1024 > s->remote_node_defrag_ratio)
return NULL;
- zonelist = &NODE_DATA(slab_node(current->mempolicy))
- ->node_zonelists[gfp_zone(flags)];
+ zonelist = &NODE_DATA(
+ slab_node(current->mempolicy))->node_zonelists[gfp_zone(flags)];
for (z = zonelist->zones; *z; z++) {
struct kmem_cache_node *n;
@@ -1337,17 +1373,22 @@ static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
{
struct kmem_cache_node *n = get_node(s, page_to_nid(page));
+ struct kmem_cache_cpu *c = get_cpu_slab(s, smp_processor_id());
This diff is incomplete. Download the complete patch.