[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>

1 files changed, 129 insertions, 0 deletions

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);