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authorTejun Heo <tj@kernel.org>2009-02-20 16:29:08 +0900
committerTejun Heo <tj@kernel.org>2009-02-20 16:29:08 +0900
commitfbf59bc9d74d1fb30b8e0630743aff2806eafcea (patch)
tree3f0a7b7cf809a25e27b7a5ba0b16321fdb901801 /kernel/module.c
parent8fc48985006da4ceba24508db64ec77fc0dfe3bb (diff)
percpu: implement new dynamic percpu allocator
Impact: new scalable dynamic percpu allocator which allows dynamic percpu areas to be accessed the same way as static ones Implement scalable dynamic percpu allocator which can be used for both static and dynamic percpu areas. This will allow static and dynamic areas to share faster direct access methods. This feature is optional and enabled only when CONFIG_HAVE_DYNAMIC_PER_CPU_AREA is defined by arch. Please read comment on top of mm/percpu.c for details. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 52b3497b874..1f0657ae555 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -51,6 +51,7 @@
#include <linux/tracepoint.h>
#include <linux/ftrace.h>
#include <linux/async.h>
+#include <linux/percpu.h>
#if 0
#define DEBUGP printk
@@ -366,6 +367,34 @@ static struct module *find_module(const char *name)
}
#ifdef CONFIG_SMP
+
+#ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA
+
+static void *percpu_modalloc(unsigned long size, unsigned long align,
+ const char *name)
+{
+ void *ptr;
+
+ if (align > PAGE_SIZE) {
+ printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
+ name, align, PAGE_SIZE);
+ align = PAGE_SIZE;
+ }
+
+ ptr = __alloc_percpu(size, align);
+ if (!ptr)
+ printk(KERN_WARNING
+ "Could not allocate %lu bytes percpu data\n", size);
+ return ptr;
+}
+
+static void percpu_modfree(void *freeme)
+{
+ free_percpu(freeme);
+}
+
+#else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
+
/* Number of blocks used and allocated. */
static unsigned int pcpu_num_used, pcpu_num_allocated;
/* Size of each block. -ve means used. */
@@ -499,6 +528,8 @@ static int percpu_modinit(void)
}
__initcall(percpu_modinit);
+#endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */
+
static unsigned int find_pcpusec(Elf_Ehdr *hdr,
Elf_Shdr *sechdrs,
const char *secstrings)