mm: compaction: add /proc trigger for memory compaction
[linux-2.6.git] / kernel / ksysfs.c
index 015fb69..0b624e7 100644 (file)
  *
  */
 
-#include <linux/config.h>
 #include <linux/kobject.h>
 #include <linux/string.h>
 #include <linux/sysfs.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/kexec.h>
+#include <linux/profile.h>
+#include <linux/sched.h>
 
 #define KERNEL_ATTR_RO(_name) \
-static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
+static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
 
 #define KERNEL_ATTR_RW(_name) \
-static struct subsys_attribute _name##_attr = \
+static struct kobj_attribute _name##_attr = \
        __ATTR(_name, 0644, _name##_show, _name##_store)
 
-#ifdef CONFIG_HOTPLUG
-static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page)
+#if defined(CONFIG_HOTPLUG)
+/* current uevent sequence number */
+static ssize_t uevent_seqnum_show(struct kobject *kobj,
+                                 struct kobj_attribute *attr, char *buf)
 {
-       return sprintf(page, "%llu\n", (unsigned long long)hotplug_seqnum);
+       return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum);
 }
-KERNEL_ATTR_RO(hotplug_seqnum);
+KERNEL_ATTR_RO(uevent_seqnum);
+
+/* uevent helper program, used during early boot */
+static ssize_t uevent_helper_show(struct kobject *kobj,
+                                 struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%s\n", uevent_helper);
+}
+static ssize_t uevent_helper_store(struct kobject *kobj,
+                                  struct kobj_attribute *attr,
+                                  const char *buf, size_t count)
+{
+       if (count+1 > UEVENT_HELPER_PATH_LEN)
+               return -ENOENT;
+       memcpy(uevent_helper, buf, count);
+       uevent_helper[count] = '\0';
+       if (count && uevent_helper[count-1] == '\n')
+               uevent_helper[count-1] = '\0';
+       return count;
+}
+KERNEL_ATTR_RW(uevent_helper);
+#endif
+
+#ifdef CONFIG_PROFILING
+static ssize_t profiling_show(struct kobject *kobj,
+                                 struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%d\n", prof_on);
+}
+static ssize_t profiling_store(struct kobject *kobj,
+                                  struct kobj_attribute *attr,
+                                  const char *buf, size_t count)
+{
+       int ret;
+
+       if (prof_on)
+               return -EEXIST;
+       /*
+        * This eventually calls into get_option() which
+        * has a ton of callers and is not const.  It is
+        * easiest to cast it away here.
+        */
+       profile_setup((char *)buf);
+       ret = profile_init();
+       if (ret)
+               return ret;
+       ret = create_proc_profile();
+       if (ret)
+               return ret;
+       return count;
+}
+KERNEL_ATTR_RW(profiling);
 #endif
 
 #ifdef CONFIG_KEXEC
-#include <asm/kexec.h>
+static ssize_t kexec_loaded_show(struct kobject *kobj,
+                                struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%d\n", !!kexec_image);
+}
+KERNEL_ATTR_RO(kexec_loaded);
 
-static ssize_t crash_notes_show(struct subsystem *subsys, char *page)
+static ssize_t kexec_crash_loaded_show(struct kobject *kobj,
+                                      struct kobj_attribute *attr, char *buf)
 {
-       return sprintf(page, "%p\n", (void *)crash_notes);
+       return sprintf(buf, "%d\n", !!kexec_crash_image);
 }
-KERNEL_ATTR_RO(crash_notes);
-#endif
+KERNEL_ATTR_RO(kexec_crash_loaded);
+
+static ssize_t kexec_crash_size_show(struct kobject *kobj,
+                                      struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%zu\n", crash_get_memory_size());
+}
+static ssize_t kexec_crash_size_store(struct kobject *kobj,
+                                  struct kobj_attribute *attr,
+                                  const char *buf, size_t count)
+{
+       unsigned long cnt;
+       int ret;
 
-decl_subsys(kernel, NULL, NULL);
-EXPORT_SYMBOL_GPL(kernel_subsys);
+       if (strict_strtoul(buf, 0, &cnt))
+               return -EINVAL;
+
+       ret = crash_shrink_memory(cnt);
+       return ret < 0 ? ret : count;
+}
+KERNEL_ATTR_RW(kexec_crash_size);
+
+static ssize_t vmcoreinfo_show(struct kobject *kobj,
+                              struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%lx %x\n",
+                      paddr_vmcoreinfo_note(),
+                      (unsigned int)vmcoreinfo_max_size);
+}
+KERNEL_ATTR_RO(vmcoreinfo);
+
+#endif /* CONFIG_KEXEC */
+
+/*
+ * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
+ */
+extern const void __start_notes __attribute__((weak));
+extern const void __stop_notes __attribute__((weak));
+#define        notes_size (&__stop_notes - &__start_notes)
+
+static ssize_t notes_read(struct file *filp, struct kobject *kobj,
+                         struct bin_attribute *bin_attr,
+                         char *buf, loff_t off, size_t count)
+{
+       memcpy(buf, &__start_notes + off, count);
+       return count;
+}
+
+static struct bin_attribute notes_attr = {
+       .attr = {
+               .name = "notes",
+               .mode = S_IRUGO,
+       },
+       .read = &notes_read,
+};
+
+struct kobject *kernel_kobj;
+EXPORT_SYMBOL_GPL(kernel_kobj);
 
 static struct attribute * kernel_attrs[] = {
-#ifdef CONFIG_HOTPLUG
-       &hotplug_seqnum_attr.attr,
+#if defined(CONFIG_HOTPLUG)
+       &uevent_seqnum_attr.attr,
+       &uevent_helper_attr.attr,
+#endif
+#ifdef CONFIG_PROFILING
+       &profiling_attr.attr,
 #endif
 #ifdef CONFIG_KEXEC
-       &crash_notes_attr.attr,
+       &kexec_loaded_attr.attr,
+       &kexec_crash_loaded_attr.attr,
+       &kexec_crash_size_attr.attr,
+       &vmcoreinfo_attr.attr,
 #endif
        NULL
 };
@@ -59,11 +180,31 @@ static struct attribute_group kernel_attr_group = {
 
 static int __init ksysfs_init(void)
 {
-       int error = subsystem_register(&kernel_subsys);
-       if (!error)
-               error = sysfs_create_group(&kernel_subsys.kset.kobj,
-                                          &kernel_attr_group);
+       int error;
+
+       kernel_kobj = kobject_create_and_add("kernel", NULL);
+       if (!kernel_kobj) {
+               error = -ENOMEM;
+               goto exit;
+       }
+       error = sysfs_create_group(kernel_kobj, &kernel_attr_group);
+       if (error)
+               goto kset_exit;
+
+       if (notes_size > 0) {
+               notes_attr.size = notes_size;
+               error = sysfs_create_bin_file(kernel_kobj, &notes_attr);
+               if (error)
+                       goto group_exit;
+       }
+
+       return 0;
 
+group_exit:
+       sysfs_remove_group(kernel_kobj, &kernel_attr_group);
+kset_exit:
+       kobject_put(kernel_kobj);
+exit:
        return error;
 }