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authorBrian King <brking@linux.vnet.ibm.com>2008-12-18 11:13:49 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-21 14:21:15 +1100
commitfecba96268fc48ab9b4a016356a8f2371df25e64 (patch)
treee9fb3bbbccee326d7ea0cbb4ffa8c4e7d31afcb7
parent2218108e182fd8a6d9106077833ed7ad05fc8e75 (diff)
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powerpc: Add reboot notifier to Collaborative Memory Manager
When running Active Memory Sharing, pages can get marked as "loaned" with the hypervisor by the CMM driver. This state gets cleared by the system firmware when rebooting the partition. When using kexec to boot a new kernel, this state never gets cleared and the hypervisor and CMM driver can get out of sync with respect to the number of pages currently marked "loaned". Fix this by adding a reboot notifier to the CMM driver to deflate the balloon and mark all pages as active. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/platforms/pseries/cmm.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 5cd4d27..6567439 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -28,6 +28,7 @@
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/oom.h>
+#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/stringify.h>
#include <linux/swap.h>
@@ -384,6 +385,26 @@ static void cmm_unregister_sysfs(struct sys_device *sysdev)
}
/**
+ * cmm_reboot_notifier - Make sure pages are not still marked as "loaned"
+ *
+ **/
+static int cmm_reboot_notifier(struct notifier_block *nb,
+ unsigned long action, void *unused)
+{
+ if (action == SYS_RESTART) {
+ if (cmm_thread_ptr)
+ kthread_stop(cmm_thread_ptr);
+ cmm_thread_ptr = NULL;
+ cmm_free_pages(loaned_pages);
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cmm_reboot_nb = {
+ .notifier_call = cmm_reboot_notifier,
+};
+
+/**
* cmm_init - Module initialization
*
* Return value:
@@ -399,9 +420,12 @@ static int cmm_init(void)
if ((rc = register_oom_notifier(&cmm_oom_nb)) < 0)
return rc;
- if ((rc = cmm_sysfs_register(&cmm_sysdev)))
+ if ((rc = register_reboot_notifier(&cmm_reboot_nb)))
goto out_oom_notifier;
+ if ((rc = cmm_sysfs_register(&cmm_sysdev)))
+ goto out_reboot_notifier;
+
if (cmm_disabled)
return rc;
@@ -415,6 +439,8 @@ static int cmm_init(void)
out_unregister_sysfs:
cmm_unregister_sysfs(&cmm_sysdev);
+out_reboot_notifier:
+ unregister_reboot_notifier(&cmm_reboot_nb);
out_oom_notifier:
unregister_oom_notifier(&cmm_oom_nb);
return rc;
@@ -431,6 +457,7 @@ static void cmm_exit(void)
if (cmm_thread_ptr)
kthread_stop(cmm_thread_ptr);
unregister_oom_notifier(&cmm_oom_nb);
+ unregister_reboot_notifier(&cmm_reboot_nb);
cmm_free_pages(loaned_pages);
cmm_unregister_sysfs(&cmm_sysdev);
}