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authorChristoph Lameter <clameter@sgi.com>2006-09-25 23:31:50 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:48:51 -0700
commitd00bcc98d7ec2c87391c9d9e1cca519ef64d33ef (patch)
tree08b7d0fafba03d7b1d4d1d861897f78658aba173
parent39bbcb8f88154c4ac9853baf3f1134af4c987517 (diff)
downloadlinux-sh-d00bcc98d7ec2c87391c9d9e1cca519ef64d33ef.tar.gz
[PATCH] Extract the allocpercpu functions from the slab allocator
The allocpercpu functions __alloc_percpu and __free_percpu() are heavily using the slab allocator. However, they are conceptually slab. This also simplifies SLOB (at this point slob may be broken in mm. This should fix it). Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--mm/Makefile2
-rw-r--r--mm/allocpercpu.c129
-rw-r--r--mm/slab.c124
-rw-r--r--mm/slob.c45
4 files changed, 130 insertions, 170 deletions
diff --git a/mm/Makefile b/mm/Makefile
index 9dd824c11eeb..60c56c0b5e10 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -23,4 +23,4 @@ obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o
-
+obj-$(CONFIG_SMP) += allocpercpu.o
diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c
new file mode 100644
index 000000000000..eaa9abeea536
--- /dev/null
+++ b/mm/allocpercpu.c
@@ -0,0 +1,129 @@
+/*
+ * linux/mm/allocpercpu.c
+ *
+ * Separated from slab.c August 11, 2006 Christoph Lameter <clameter@sgi.com>
+ */
+#include <linux/mm.h>
+#include <linux/module.h>
+
+/**
+ * percpu_depopulate - depopulate per-cpu data for given cpu
+ * @__pdata: per-cpu data to depopulate
+ * @cpu: depopulate per-cpu data for this cpu
+ *
+ * Depopulating per-cpu data for a cpu going offline would be a typical
+ * use case. You need to register a cpu hotplug handler for that purpose.
+ */
+void percpu_depopulate(void *__pdata, int cpu)
+{
+ struct percpu_data *pdata = __percpu_disguise(__pdata);
+ if (pdata->ptrs[cpu]) {
+ kfree(pdata->ptrs[cpu]);
+ pdata->ptrs[cpu] = NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(percpu_depopulate);
+
+/**
+ * percpu_depopulate_mask - depopulate per-cpu data for some cpu's
+ * @__pdata: per-cpu data to depopulate
+ * @mask: depopulate per-cpu data for cpu's selected through mask bits
+ */
+void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask)
+{
+ int cpu;
+ for_each_cpu_mask(cpu, *mask)
+ percpu_depopulate(__pdata, cpu);
+}
+EXPORT_SYMBOL_GPL(__percpu_depopulate_mask);
+
+/**
+ * percpu_populate - populate per-cpu data for given cpu
+ * @__pdata: per-cpu data to populate further
+ * @size: size of per-cpu object
+ * @gfp: may sleep or not etc.
+ * @cpu: populate per-data for this cpu
+ *
+ * Populating per-cpu data for a cpu coming online would be a typical
+ * use case. You need to register a cpu hotplug handler for that purpose.
+ * Per-cpu object is populated with zeroed buffer.
+ */
+void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu)
+{
+ struct percpu_data *pdata = __percpu_disguise(__pdata);
+ int node = cpu_to_node(cpu);
+
+ BUG_ON(pdata->ptrs[cpu]);
+ if (node_online(node)) {
+ /* FIXME: kzalloc_node(size, gfp, node) */
+ pdata->ptrs[cpu] = kmalloc_node(size, gfp, node);
+ if (pdata->ptrs[cpu])
+ memset(pdata->ptrs[cpu], 0, size);
+ } else
+ pdata->ptrs[cpu] = kzalloc(size, gfp);
+ return pdata->ptrs[cpu];
+}
+EXPORT_SYMBOL_GPL(percpu_populate);
+
+/**
+ * percpu_populate_mask - populate per-cpu data for more cpu's
+ * @__pdata: per-cpu data to populate further
+ * @size: size of per-cpu object
+ * @gfp: may sleep or not etc.
+ * @mask: populate per-cpu data for cpu's selected through mask bits
+ *
+ * Per-cpu objects are populated with zeroed buffers.
+ */
+int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
+ cpumask_t *mask)
+{
+ cpumask_t populated = CPU_MASK_NONE;
+ int cpu;
+
+ for_each_cpu_mask(cpu, *mask)
+ if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) {
+ __percpu_depopulate_mask(__pdata, &populated);
+ return -ENOMEM;
+ } else
+ cpu_set(cpu, populated);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__percpu_populate_mask);
+
+/**
+ * percpu_alloc_mask - initial setup of per-cpu data
+ * @size: size of per-cpu object
+ * @gfp: may sleep or not etc.
+ * @mask: populate per-data for cpu's selected through mask bits
+ *
+ * Populating per-cpu data for all online cpu's would be a typical use case,
+ * which is simplified by the percpu_alloc() wrapper.
+ * Per-cpu objects are populated with zeroed buffers.
+ */
+void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
+{
+ void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
+ void *__pdata = __percpu_disguise(pdata);
+
+ if (unlikely(!pdata))
+ return NULL;
+ if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask)))
+ return __pdata;
+ kfree(pdata);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
+
+/**
+ * percpu_free - final cleanup of per-cpu data
+ * @__pdata: object to clean up
+ *
+ * We simply clean up any per-cpu object left. No need for the client to
+ * track and specify through a bis mask which per-cpu objects are to free.
+ */
+void percpu_free(void *__pdata)
+{
+ __percpu_depopulate_mask(__pdata, &cpu_possible_map);
+ kfree(__percpu_disguise(__pdata));
+}
+EXPORT_SYMBOL_GPL(percpu_free);
diff --git a/mm/slab.c b/mm/slab.c
index 619337a5cb2b..13b5050f84cc 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3440,130 +3440,6 @@ void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller)
EXPORT_SYMBOL(__kmalloc_track_caller);
#endif
-#ifdef CONFIG_SMP
-/**
- * percpu_depopulate - depopulate per-cpu data for given cpu
- * @__pdata: per-cpu data to depopulate
- * @cpu: depopulate per-cpu data for this cpu
- *
- * Depopulating per-cpu data for a cpu going offline would be a typical
- * use case. You need to register a cpu hotplug handler for that purpose.
- */
-void percpu_depopulate(void *__pdata, int cpu)
-{
- struct percpu_data *pdata = __percpu_disguise(__pdata);
- if (pdata->ptrs[cpu]) {
- kfree(pdata->ptrs[cpu]);
- pdata->ptrs[cpu] = NULL;
- }
-}
-EXPORT_SYMBOL_GPL(percpu_depopulate);
-
-/**
- * percpu_depopulate_mask - depopulate per-cpu data for some cpu's
- * @__pdata: per-cpu data to depopulate
- * @mask: depopulate per-cpu data for cpu's selected through mask bits
- */
-void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask)
-{
- int cpu;
- for_each_cpu_mask(cpu, *mask)
- percpu_depopulate(__pdata, cpu);
-}
-EXPORT_SYMBOL_GPL(__percpu_depopulate_mask);
-
-/**
- * percpu_populate - populate per-cpu data for given cpu
- * @__pdata: per-cpu data to populate further
- * @size: size of per-cpu object
- * @gfp: may sleep or not etc.
- * @cpu: populate per-data for this cpu
- *
- * Populating per-cpu data for a cpu coming online would be a typical
- * use case. You need to register a cpu hotplug handler for that purpose.
- * Per-cpu object is populated with zeroed buffer.
- */
-void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu)
-{
- struct percpu_data *pdata = __percpu_disguise(__pdata);
- int node = cpu_to_node(cpu);
-
- BUG_ON(pdata->ptrs[cpu]);
- if (node_online(node)) {
- /* FIXME: kzalloc_node(size, gfp, node) */
- pdata->ptrs[cpu] = kmalloc_node(size, gfp, node);
- if (pdata->ptrs[cpu])
- memset(pdata->ptrs[cpu], 0, size);
- } else
- pdata->ptrs[cpu] = kzalloc(size, gfp);
- return pdata->ptrs[cpu];
-}
-EXPORT_SYMBOL_GPL(percpu_populate);
-
-/**
- * percpu_populate_mask - populate per-cpu data for more cpu's
- * @__pdata: per-cpu data to populate further
- * @size: size of per-cpu object
- * @gfp: may sleep or not etc.
- * @mask: populate per-cpu data for cpu's selected through mask bits
- *
- * Per-cpu objects are populated with zeroed buffers.
- */
-int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp,
- cpumask_t *mask)
-{
- cpumask_t populated = CPU_MASK_NONE;
- int cpu;
-
- for_each_cpu_mask(cpu, *mask)
- if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) {
- __percpu_depopulate_mask(__pdata, &populated);
- return -ENOMEM;
- } else
- cpu_set(cpu, populated);
- return 0;
-}
-EXPORT_SYMBOL_GPL(__percpu_populate_mask);
-
-/**
- * percpu_alloc_mask - initial setup of per-cpu data
- * @size: size of per-cpu object
- * @gfp: may sleep or not etc.
- * @mask: populate per-data for cpu's selected through mask bits
- *
- * Populating per-cpu data for all online cpu's would be a typical use case,
- * which is simplified by the percpu_alloc() wrapper.
- * Per-cpu objects are populated with zeroed buffers.
- */
-void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
-{
- void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
- void *__pdata = __percpu_disguise(pdata);
-
- if (unlikely(!pdata))
- return NULL;
- if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask)))
- return __pdata;
- kfree(pdata);
- return NULL;
-}
-EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
-
-/**
- * percpu_free - final cleanup of per-cpu data
- * @__pdata: object to clean up
- *
- * We simply clean up any per-cpu object left. No need for the client to
- * track and specify through a bis mask which per-cpu objects are to free.
- */
-void percpu_free(void *__pdata)
-{
- __percpu_depopulate_mask(__pdata, &cpu_possible_map);
- kfree(__percpu_disguise(__pdata));
-}
-EXPORT_SYMBOL_GPL(percpu_free);
-#endif /* CONFIG_SMP */
-
/**
* kmem_cache_free - Deallocate an object
* @cachep: The cache the allocation was from.
diff --git a/mm/slob.c b/mm/slob.c
index 7b52b20b9607..4c28a421b270 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -343,48 +343,3 @@ void kmem_cache_init(void)
atomic_t slab_reclaim_pages = ATOMIC_INIT(0);
EXPORT_SYMBOL(slab_reclaim_pages);
-#ifdef CONFIG_SMP
-
-void *__alloc_percpu(size_t size)
-{
- int i;
- struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL);
-
- if (!pdata)
- return NULL;
-
- for_each_possible_cpu(i) {
- pdata->ptrs[i] = kmalloc(size, GFP_KERNEL);
- if (!pdata->ptrs[i])
- goto unwind_oom;
- memset(pdata->ptrs[i], 0, size);
- }
-
- /* Catch derefs w/o wrappers */
- return (void *) (~(unsigned long) pdata);
-
-unwind_oom:
- while (--i >= 0) {
- if (!cpu_possible(i))
- continue;
- kfree(pdata->ptrs[i]);
- }
- kfree(pdata);
- return NULL;
-}
-EXPORT_SYMBOL(__alloc_percpu);
-
-void
-free_percpu(const void *objp)
-{
- int i;
- struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp);
-
- for_each_possible_cpu(i)
- kfree(p->ptrs[i]);
-
- kfree(p);
-}
-EXPORT_SYMBOL(free_percpu);
-
-#endif