[PATCH/RFC 4/11] numa - Automatic-migration - ia64 check notify migrate pending

[Lee Schermerhorn <lee.schermerhorn@hp.com>]

AutoPage Migration - ia64 check/notify internode migration

NOTE:  not recently tested on ia64

This patch hooks the check for task memory migration pending
into the ia64 do_notify_resume() function.  Call to
check_migrate_pending() is a no-op if automigration is not
configured.

TODO:  reconcile automigration and trace use of 'NOTIFY_RESUME

Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@hp.com>

 arch/ia64/kernel/process.c |    9 +++++++++
 1 file changed, 9 insertions(+)

Index: linux-2.6.36-mmotm-101103-1217/arch/ia64/kernel/process.c
===================================================================
--- linux-2.6.36-mmotm-101103-1217.orig/arch/ia64/kernel/process.c
+++ linux-2.6.36-mmotm-101103-1217/arch/ia64/kernel/process.c
@@ -29,6 +29,7 @@
 #include <linux/kdebug.h>
 #include <linux/utsname.h>
 #include <linux/tracehook.h>
+#include <linux/auto-migrate.h>
 
 #include <asm/cpu.h>
 #include <asm/delay.h>
@@ -193,12 +194,20 @@ do_notify_resume_user(sigset_t *unused,
 		pfm_handle_work();
 #endif
 
+	/*
+	 * check for task memory migration before delivering
+	 * signals so that hander[s] use memory in new node.
+	 */
+	check_migrate_pending();
+
 	/* deal with pending signal delivery */
 	if (test_thread_flag(TIF_SIGPENDING)) {
 		local_irq_enable();	/* force interrupt enable */
 		ia64_do_signal(scr, in_syscall);
 	}
 
+//TODO:  make sure tracehook_notify_resume() is NO-OP if not enabled
+//       by something other than TIF_NOTIFY_RESUME which is general flag.
 	if (test_thread_flag(TIF_NOTIFY_RESUME)) {
 		clear_thread_flag(TIF_NOTIFY_RESUME);
 		tracehook_notify_resume(&scr->pt);