percpu: add __read_mostly to variables which are mostly read only
Most global variables in percpu allocator are initialized during boot
and read only from that point on. Add __read_mostly as per Rusty's
suggestion.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/mm/percpu.c b/mm/percpu.c
index 9ac0198..5954e7a 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -83,18 +83,18 @@
struct page *page[]; /* #cpus * UNIT_PAGES */
};
-static int pcpu_unit_pages;
-static int pcpu_unit_size;
-static int pcpu_chunk_size;
-static int pcpu_nr_slots;
-static size_t pcpu_chunk_struct_size;
+static int pcpu_unit_pages __read_mostly;
+static int pcpu_unit_size __read_mostly;
+static int pcpu_chunk_size __read_mostly;
+static int pcpu_nr_slots __read_mostly;
+static size_t pcpu_chunk_struct_size __read_mostly;
/* the address of the first chunk which starts with the kernel static area */
-void *pcpu_base_addr;
+void *pcpu_base_addr __read_mostly;
EXPORT_SYMBOL_GPL(pcpu_base_addr);
/* the size of kernel static area */
-static int pcpu_static_size;
+static int pcpu_static_size __read_mostly;
/*
* One mutex to rule them all.
@@ -112,7 +112,7 @@
*/
static DEFINE_MUTEX(pcpu_mutex);
-static struct list_head *pcpu_slot; /* chunk list slots */
+static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
static struct rb_root pcpu_addr_root = RB_ROOT; /* chunks by address */
static int __pcpu_size_to_slot(int size)