mm/sl[au]b: Move slabinfo processing to slab_common.c

This patch moves all the common machinery to slabinfo processing
to slab_common.c. We can do better by noticing that the output is
heavily common, and having the allocators to just provide finished
information about this. But after this first step, this can be done
easier.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Acked-by: Christoph Lameter <cl@linux.com>
CC: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/mm/slab.c b/mm/slab.c
index 33d3363658df78bc95b928202856a01ed7c54d77..a6e045c13b8d927a85d1f361411796ece72096cc 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4277,7 +4277,7 @@ out:
 
 #ifdef CONFIG_SLABINFO
 
-static void print_slabinfo_header(struct seq_file *m)
+void print_slabinfo_header(struct seq_file *m)
 {
        /*
         * Output format version, so at least we can change it
@@ -4300,28 +4300,7 @@ static void print_slabinfo_header(struct seq_file *m)
        seq_putc(m, '\n');
 }
 
-static void *s_start(struct seq_file *m, loff_t *pos)
-{
-       loff_t n = *pos;
-
-       mutex_lock(&slab_mutex);
-       if (!n)
-               print_slabinfo_header(m);
-
-       return seq_list_start(&slab_caches, *pos);
-}
-
-static void *s_next(struct seq_file *m, void *p, loff_t *pos)
-{
-       return seq_list_next(p, &slab_caches, pos);
-}
-
-static void s_stop(struct seq_file *m, void *p)
-{
-       mutex_unlock(&slab_mutex);
-}
-
-static int s_show(struct seq_file *m, void *p)
+int slabinfo_show(struct seq_file *m, void *p)
 {
        struct kmem_cache *cachep = list_entry(p, struct kmem_cache, list);
        struct slab *slabp;
@@ -4418,27 +4397,6 @@ static int s_show(struct seq_file *m, void *p)
        return 0;
 }
 
-/*
- * slabinfo_op - iterator that generates /proc/slabinfo
- *
- * Output layout:
- * cache-name
- * num-active-objs
- * total-objs
- * object size
- * num-active-slabs
- * total-slabs
- * num-pages-per-slab
- * + further values on SMP and with statistics enabled
- */
-
-static const struct seq_operations slabinfo_op = {
-       .start = s_start,
-       .next = s_next,
-       .stop = s_stop,
-       .show = s_show,
-};
-
 #define MAX_SLABINFO_WRITE 128
 /**
  * slabinfo_write - Tuning for the slab allocator
@@ -4447,7 +4405,7 @@ static const struct seq_operations slabinfo_op = {
  * @count: data length
  * @ppos: unused
  */
-static ssize_t slabinfo_write(struct file *file, const char __user *buffer,
+ssize_t slabinfo_write(struct file *file, const char __user *buffer,
                       size_t count, loff_t *ppos)
 {
        char kbuf[MAX_SLABINFO_WRITE + 1], *tmp;
@@ -4490,19 +4448,6 @@ static ssize_t slabinfo_write(struct file *file, const char __user *buffer,
        return res;
 }
 
-static int slabinfo_open(struct inode *inode, struct file *file)
-{
-       return seq_open(file, &slabinfo_op);
-}
-
-static const struct file_operations proc_slabinfo_operations = {
-       .open           = slabinfo_open,
-       .read           = seq_read,
-       .write          = slabinfo_write,
-       .llseek         = seq_lseek,
-       .release        = seq_release,
-};
-
 #ifdef CONFIG_DEBUG_SLAB_LEAK
 
 static void *leaks_start(struct seq_file *m, loff_t *pos)
@@ -4631,6 +4576,16 @@ static int leaks_show(struct seq_file *m, void *p)
        return 0;
 }
 
+static void *s_next(struct seq_file *m, void *p, loff_t *pos)
+{
+       return seq_list_next(p, &slab_caches, pos);
+}
+
+static void s_stop(struct seq_file *m, void *p)
+{
+       mutex_unlock(&slab_mutex);
+}
+
 static const struct seq_operations slabstats_op = {
        .start = leaks_start,
        .next = s_next,
@@ -4665,7 +4620,6 @@ static const struct file_operations proc_slabstats_operations = {
 
 static int __init slab_proc_init(void)
 {
-       proc_create("slabinfo",S_IWUSR|S_IRUSR,NULL,&proc_slabinfo_operations);
 #ifdef CONFIG_DEBUG_SLAB_LEAK
        proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 #endif

diff --git a/mm/slab.h b/mm/slab.h
index 7deeb449a3013ea279fde16bf6935b9d23ba752a..dc78101962a1a382b459a9c584a7933347010c41 100644 (file)
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -47,4 +47,12 @@ static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t siz
 
 int __kmem_cache_shutdown(struct kmem_cache *);
 
+struct seq_file;
+struct file;
+void print_slabinfo_header(struct seq_file *m);
+
+int slabinfo_show(struct seq_file *m, void *p);
+
+ssize_t slabinfo_write(struct file *file, const char __user *buffer,
+                      size_t count, loff_t *ppos);
 #endif

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 069a24e64403f19bd6f51c9d9a9ef4b56deef48d..2e4b4c6d89e2ef10c59b1ff1d90533da1c085372 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -13,6 +13,8 @@
 #include <linux/module.h>
 #include <linux/cpu.h>
 #include <linux/uaccess.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 #include <asm/page.h>
@@ -192,3 +194,71 @@ int slab_is_available(void)
 {
        return slab_state >= UP;
 }
+
+#ifdef CONFIG_SLABINFO
+static void *s_start(struct seq_file *m, loff_t *pos)
+{
+       loff_t n = *pos;
+
+       mutex_lock(&slab_mutex);
+       if (!n)
+               print_slabinfo_header(m);
+
+       return seq_list_start(&slab_caches, *pos);
+}
+
+static void *s_next(struct seq_file *m, void *p, loff_t *pos)
+{
+       return seq_list_next(p, &slab_caches, pos);
+}
+
+static void s_stop(struct seq_file *m, void *p)
+{
+       mutex_unlock(&slab_mutex);
+}
+
+static int s_show(struct seq_file *m, void *p)
+{
+       return slabinfo_show(m, p);
+}
+
+/*
+ * slabinfo_op - iterator that generates /proc/slabinfo
+ *
+ * Output layout:
+ * cache-name
+ * num-active-objs
+ * total-objs
+ * object size
+ * num-active-slabs
+ * total-slabs
+ * num-pages-per-slab
+ * + further values on SMP and with statistics enabled
+ */
+static const struct seq_operations slabinfo_op = {
+       .start = s_start,
+       .next = s_next,
+       .stop = s_stop,
+       .show = s_show,
+};
+
+static int slabinfo_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &slabinfo_op);
+}
+
+static const struct file_operations proc_slabinfo_operations = {
+       .open           = slabinfo_open,
+       .read           = seq_read,
+       .write          = slabinfo_write,
+       .llseek         = seq_lseek,
+       .release        = seq_release,
+};
+
+static int __init slab_proc_init(void)
+{
+       proc_create("slabinfo", S_IRUSR, NULL, &proc_slabinfo_operations);
+       return 0;
+}
+module_init(slab_proc_init);
+#endif /* CONFIG_SLABINFO */

diff --git a/mm/slub.c b/mm/slub.c
index a0d698467f706bd617b960240cbb775cdc9cd034..77a0c8a9fc75c61a0590529483bf738af39cf84e 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5405,7 +5405,7 @@ __initcall(slab_sysfs_init);
  * The /proc/slabinfo ABI
  */
 #ifdef CONFIG_SLABINFO
-static void print_slabinfo_header(struct seq_file *m)
+void print_slabinfo_header(struct seq_file *m)
 {
        seq_puts(m, "slabinfo - version: 2.1\n");
        seq_puts(m, "# name            <active_objs> <num_objs> <object_size> "
@@ -5415,28 +5415,7 @@ static void print_slabinfo_header(struct seq_file *m)
        seq_putc(m, '\n');
 }
 
-static void *s_start(struct seq_file *m, loff_t *pos)
-{
-       loff_t n = *pos;
-
-       mutex_lock(&slab_mutex);
-       if (!n)
-               print_slabinfo_header(m);
-
-       return seq_list_start(&slab_caches, *pos);
-}
-
-static void *s_next(struct seq_file *m, void *p, loff_t *pos)
-{
-       return seq_list_next(p, &slab_caches, pos);
-}
-
-static void s_stop(struct seq_file *m, void *p)
-{
-       mutex_unlock(&slab_mutex);
-}
-
-static int s_show(struct seq_file *m, void *p)
+int slabinfo_show(struct seq_file *m, void *p)
 {
        unsigned long nr_partials = 0;
        unsigned long nr_slabs = 0;
@@ -5472,29 +5451,9 @@ static int s_show(struct seq_file *m, void *p)
        return 0;
 }
 
-static const struct seq_operations slabinfo_op = {
-       .start = s_start,
-       .next = s_next,
-       .stop = s_stop,
-       .show = s_show,
-};
-
-static int slabinfo_open(struct inode *inode, struct file *file)
-{
-       return seq_open(file, &slabinfo_op);
-}
-
-static const struct file_operations proc_slabinfo_operations = {
-       .open           = slabinfo_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = seq_release,
-};
-
-static int __init slab_proc_init(void)
+ssize_t slabinfo_write(struct file *file, const char __user *buffer,
+                      size_t count, loff_t *ppos)
 {
-       proc_create("slabinfo", S_IRUSR, NULL, &proc_slabinfo_operations);
-       return 0;
+       return -EIO;
 }
-module_init(slab_proc_init);
 #endif /* CONFIG_SLABINFO */