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Subject[GIT PULL v2] Early SLAB fixes for 2.6.31
Hi Linus,

I dropped the GFP_WAIT conversion patch and added the gfp masking patch
you liked. I tested this on x86-64 with both SLAB and SLUB.

Pekka

The following changes since commit 8ebf975608aaebd7feb33d77f07ba21a6380e086:
Randy Dunlap (1):
block: fix kernel-doc in recent block/ changes

are available in the git repository at:

ssh://master.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 topic/slab/earlyboot-v2

KAMEZAWA Hiroyuki (1):
memcg: fix page_cgroup fatal error in FLATMEM

Pekka Enberg (3):
slab: fix gfp flag in setup_cpu_cache()
slab,slub: don't enable interrupts during early boot
slab: setup cpu caches later on when interrupts are enabled

Yinghai Lu (2):
irq: slab alloc for default irq_affinity
x86: make zap_low_mapping could be used early

arch/x86/include/asm/tlbflush.h | 2 +-
arch/x86/kernel/smpboot.c | 2 +-
arch/x86/mm/init_32.c | 10 ++++++--
include/linux/gfp.h | 3 ++
include/linux/page_cgroup.h | 18 ++++++++++++++++-
include/linux/slab.h | 2 +
include/linux/slob_def.h | 5 ++++
include/linux/slub_def.h | 2 +
init/main.c | 6 +++++
kernel/irq/handle.c | 2 +-
mm/page_cgroup.c | 29 +++++++++------------------
mm/slab.c | 41 ++++++++++++++++++++++++++++----------
mm/slub.c | 16 +++++++++++++++
13 files changed, 101 insertions(+), 37 deletions(-)
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index a5ecc9c..7f3eba0 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -172,6 +172,6 @@ static inline void flush_tlb_kernel_range(unsigned long start,
flush_tlb_all();
}

-extern void zap_low_mappings(void);
+extern void zap_low_mappings(bool early);

#endif /* _ASM_X86_TLBFLUSH_H */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7c80007..2fecda6 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -873,7 +873,7 @@ int __cpuinit native_cpu_up(unsigned int cpu)

err = do_boot_cpu(apicid, cpu);

- zap_low_mappings();
+ zap_low_mappings(false);
low_mappings = 0;
#else
err = do_boot_cpu(apicid, cpu);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 949708d..9ff3c08 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -564,7 +564,7 @@ static inline void save_pg_dir(void)
}
#endif /* !CONFIG_ACPI_SLEEP */

-void zap_low_mappings(void)
+void zap_low_mappings(bool early)
{
int i;

@@ -581,7 +581,11 @@ void zap_low_mappings(void)
set_pgd(swapper_pg_dir+i, __pgd(0));
#endif
}
- flush_tlb_all();
+
+ if (early)
+ __flush_tlb();
+ else
+ flush_tlb_all();
}

pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
@@ -956,7 +960,7 @@ void __init mem_init(void)
test_wp_bit();

save_pg_dir();
- zap_low_mappings();
+ zap_low_mappings(true);
}

#ifdef CONFIG_MEMORY_HOTPLUG
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 0bbc15f..3760e7c 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -85,6 +85,9 @@ struct vm_area_struct;
__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
__GFP_NORETRY|__GFP_NOMEMALLOC)

+/* Control slab gfp mask during early boot */
+#define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
+
/* Control allocation constraints */
#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)

diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
index 7339c7b..13f126c 100644
--- a/include/linux/page_cgroup.h
+++ b/include/linux/page_cgroup.h
@@ -18,7 +18,19 @@ struct page_cgroup {
};

void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat);
-void __init page_cgroup_init(void);
+
+#ifdef CONFIG_SPARSEMEM
+static inline void __init page_cgroup_init_flatmem(void)
+{
+}
+extern void __init page_cgroup_init(void);
+#else
+void __init page_cgroup_init_flatmem(void);
+static inline void __init page_cgroup_init(void)
+{
+}
+#endif
+
struct page_cgroup *lookup_page_cgroup(struct page *page);

enum {
@@ -87,6 +99,10 @@ static inline void page_cgroup_init(void)
{
}

+static inline void __init page_cgroup_init_flatmem(void)
+{
+}
+
#endif

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 4880306..219b8fb 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -319,4 +319,6 @@ static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
return kmalloc_node(size, flags | __GFP_ZERO, node);
}

+void __init kmem_cache_init_late(void);
+
#endif /* _LINUX_SLAB_H */
diff --git a/include/linux/slob_def.h b/include/linux/slob_def.h
index 0ec00b3..bb5368d 100644
--- a/include/linux/slob_def.h
+++ b/include/linux/slob_def.h
@@ -34,4 +34,9 @@ static __always_inline void *__kmalloc(size_t size, gfp_t flags)
return kmalloc(size, flags);
}

+static inline void kmem_cache_init_late(void)
+{
+ /* Nothing to do */
+}
+
#endif /* __LINUX_SLOB_DEF_H */
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index be5d40c..4dcbc2c 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -302,4 +302,6 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
}
#endif

+void __init kmem_cache_init_late(void);
+
#endif /* _LINUX_SLUB_DEF_H */
diff --git a/init/main.c b/init/main.c
index 5616661..f6204f7 100644
--- a/init/main.c
+++ b/init/main.c
@@ -539,6 +539,11 @@ void __init __weak thread_info_cache_init(void)
*/
static void __init mm_init(void)
{
+ /*
+ * page_cgroup requires countinous pages as memmap
+ * and it's bigger than MAX_ORDER unless SPARSEMEM.
+ */
+ page_cgroup_init_flatmem();
mem_init();
kmem_cache_init();
vmalloc_init();
@@ -635,6 +640,7 @@ asmlinkage void __init start_kernel(void)
"enabled early\n");
early_boot_irqs_on();
local_irq_enable();
+ kmem_cache_init_late();

/*
* HACK ALERT! This is early. We're enabling the console before
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 1045785..065205b 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -45,7 +45,7 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
static void __init init_irq_default_affinity(void)
{
- alloc_bootmem_cpumask_var(&irq_default_affinity);
+ alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
cpumask_setall(irq_default_affinity);
}
#else
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 3dd4a90..11a8a10 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -47,8 +47,6 @@ static int __init alloc_node_page_cgroup(int nid)
struct page_cgroup *base, *pc;
unsigned long table_size;
unsigned long start_pfn, nr_pages, index;
- struct page *page;
- unsigned int order;

start_pfn = NODE_DATA(nid)->node_start_pfn;
nr_pages = NODE_DATA(nid)->node_spanned_pages;
@@ -57,13 +55,11 @@ static int __init alloc_node_page_cgroup(int nid)
return 0;

table_size = sizeof(struct page_cgroup) * nr_pages;
- order = get_order(table_size);
- page = alloc_pages_node(nid, GFP_NOWAIT | __GFP_ZERO, order);
- if (!page)
- page = alloc_pages_node(-1, GFP_NOWAIT | __GFP_ZERO, order);
- if (!page)
+
+ base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
+ table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
+ if (!base)
return -ENOMEM;
- base = page_address(page);
for (index = 0; index < nr_pages; index++) {
pc = base + index;
__init_page_cgroup(pc, start_pfn + index);
@@ -73,7 +69,7 @@ static int __init alloc_node_page_cgroup(int nid)
return 0;
}

-void __init page_cgroup_init(void)
+void __init page_cgroup_init_flatmem(void)
{

int nid, fail;
@@ -117,16 +113,11 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
if (!section->page_cgroup) {
nid = page_to_nid(pfn_to_page(pfn));
table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
- if (slab_is_available()) {
- base = kmalloc_node(table_size,
- GFP_KERNEL | __GFP_NOWARN, nid);
- if (!base)
- base = vmalloc_node(table_size, nid);
- } else {
- base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
- table_size,
- PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
- }
+ VM_BUG_ON(!slab_is_available());
+ base = kmalloc_node(table_size,
+ GFP_KERNEL | __GFP_NOWARN, nid);
+ if (!base)
+ base = vmalloc_node(table_size, nid);
} else {
/*
* We don't have to allocate page_cgroup again, but
diff --git a/mm/slab.c b/mm/slab.c
index f46b65d..18e3164 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -304,6 +304,12 @@ struct kmem_list3 {
};

/*
+ * The slab allocator is initialized with interrupts disabled. Therefore, make
+ * sure early boot allocations don't accidentally enable interrupts.
+ */
+static gfp_t slab_gfp_mask __read_mostly = SLAB_GFP_BOOT_MASK;
+
+/*
* Need this for bootstrapping a per node allocator.
*/
#define NUM_INIT_LISTS (3 * MAX_NUMNODES)
@@ -753,6 +759,7 @@ static enum {
NONE,
PARTIAL_AC,
PARTIAL_L3,
+ EARLY,
FULL
} g_cpucache_up;

@@ -761,7 +768,7 @@ static enum {
*/
int slab_is_available(void)
{
- return g_cpucache_up == FULL;
+ return g_cpucache_up >= EARLY;
}

static DEFINE_PER_CPU(struct delayed_work, reap_work);
@@ -1625,19 +1632,27 @@ void __init kmem_cache_init(void)
}
}

- /* 6) resize the head arrays to their final sizes */
- {
- struct kmem_cache *cachep;
- mutex_lock(&cache_chain_mutex);
- list_for_each_entry(cachep, &cache_chain, next)
- if (enable_cpucache(cachep, GFP_NOWAIT))
- BUG();
- mutex_unlock(&cache_chain_mutex);
- }
+ g_cpucache_up = EARLY;

/* Annotate slab for lockdep -- annotate the malloc caches */
init_lock_keys();
+}
+
+void __init kmem_cache_init_late(void)
+{
+ struct kmem_cache *cachep;
+
+ /*
+ * Interrupts are enabled now so all GFP allocations are safe.
+ */
+ slab_gfp_mask = __GFP_BITS_MASK;

+ /* 6) resize the head arrays to their final sizes */
+ mutex_lock(&cache_chain_mutex);
+ list_for_each_entry(cachep, &cache_chain, next)
+ if (enable_cpucache(cachep, GFP_NOWAIT))
+ BUG();
+ mutex_unlock(&cache_chain_mutex);

/* Done! */
g_cpucache_up = FULL;
@@ -2102,7 +2117,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
for_each_online_node(node) {
cachep->nodelists[node] =
kmalloc_node(sizeof(struct kmem_list3),
- GFP_KERNEL, node);
+ gfp, node);
BUG_ON(!cachep->nodelists[node]);
kmem_list3_init(cachep->nodelists[node]);
}
@@ -3354,6 +3369,8 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
unsigned long save_flags;
void *ptr;

+ flags &= slab_gfp_mask;
+
lockdep_trace_alloc(flags);

if (slab_should_failslab(cachep, flags))
@@ -3434,6 +3451,8 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
unsigned long save_flags;
void *objp;

+ flags &= slab_gfp_mask;
+
lockdep_trace_alloc(flags);

if (slab_should_failslab(cachep, flags))
diff --git a/mm/slub.c b/mm/slub.c
index 3964d3c..30354bf 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -178,6 +178,12 @@ static enum {
SYSFS /* Sysfs up */
} slab_state = DOWN;

+/*
+ * The slab allocator is initialized with interrupts disabled. Therefore, make
+ * sure early boot allocations don't accidentally enable interrupts.
+ */
+static gfp_t slab_gfp_mask __read_mostly = SLAB_GFP_BOOT_MASK;
+
/* A list of all slab caches on the system */
static DECLARE_RWSEM(slub_lock);
static LIST_HEAD(slab_caches);
@@ -1595,6 +1601,8 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
unsigned long flags;
unsigned int objsize;

+ gfpflags &= slab_gfp_mask;
+
lockdep_trace_alloc(gfpflags);
might_sleep_if(gfpflags & __GFP_WAIT);

@@ -3104,6 +3112,14 @@ void __init kmem_cache_init(void)
nr_cpu_ids, nr_node_ids);
}

+void __init kmem_cache_init_late(void)
+{
+ /*
+ * Interrupts are enabled now so all GFP allocations are safe.
+ */
+ slab_gfp_mask = __GFP_BITS_MASK;
+}
+
/*
* Find a mergeable slab cache
*/

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