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-rw-r--r--arch/ia64/kernel/perfmon.c13
-rw-r--r--arch/ia64/kernel/process.c14
2 files changed, 24 insertions, 3 deletions
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 376fcbc3f8d..fd4f3be6e85 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -1265,6 +1265,8 @@ out:
}
EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
+extern void update_pal_halt_status(int);
+
static int
pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
{
@@ -1311,6 +1313,11 @@ pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
+ /*
+ * disable default_idle() to go to PAL_HALT
+ */
+ update_pal_halt_status(0);
+
UNLOCK_PFS(flags);
return 0;
@@ -1366,6 +1373,12 @@ pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
+ /*
+ * if possible, enable default_idle() to go into PAL_HALT
+ */
+ if (pfm_sessions.pfs_task_sessions == 0 && pfm_sessions.pfs_sys_sessions == 0)
+ update_pal_halt_status(1);
+
UNLOCK_PFS(flags);
return 0;
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index c0140f4235e..474d75f9de8 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -173,7 +173,9 @@ do_notify_resume_user (sigset_t *oldset, struct sigscratch *scr, long in_syscall
ia64_do_signal(oldset, scr, in_syscall);
}
-static int pal_halt = 1;
+static int pal_halt = 1;
+static int can_do_pal_halt = 1;
+
static int __init nohalt_setup(char * str)
{
pal_halt = 0;
@@ -181,16 +183,22 @@ static int __init nohalt_setup(char * str)
}
__setup("nohalt", nohalt_setup);
+int
+update_pal_halt_status(int status)
+{
+ can_do_pal_halt = pal_halt && status;
+}
+
/*
* We use this if we don't have any better idle routine..
*/
void
default_idle (void)
{
- unsigned long pmu_active = ia64_getreg(_IA64_REG_PSR) & (IA64_PSR_PP | IA64_PSR_UP);
+ int can_do_pal;
while (!need_resched())
- if (pal_halt && !pmu_active)
+ if (can_do_pal_halt)
safe_halt();
else
cpu_relax();