ACPI: Read TSC upon resume

Commit Message

Sameer Nanda Oct. 6, 2010, 11:15 p.m. UTC

None

Patch

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index c0fed2e..f0588fa 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -214,6 +214,7 @@  static int acpi_suspend_enter(suspend_state_t pm_state)
 	acpi_status status = AE_OK;
 	unsigned long flags = 0;
 	u32 acpi_state = acpi_target_sleep_state;
+	u64 tsc;
 
 	ACPI_FLUSH_CPU_CACHE();
 
@@ -235,6 +236,9 @@  static int acpi_suspend_enter(suspend_state_t pm_state)
 
 	case ACPI_STATE_S3:
 		do_suspend_lowlevel();
+		rdtscll(tsc);
+		printk(KERN_INFO "TSC at resume: %llu\n",
+				(unsigned long long)tsc);
 		break;
 	}