aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/cpu/intel.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2009-03-26 16:05:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-26 16:05:01 -0700
commit831576fe40f4175e0767623cffa4aeb28157943a (patch)
treede54e628e5849d6cf201df4446d760d17f752326 /arch/x86/kernel/cpu/intel.c
parent21cdbc1378e8aa96e1ed4a606dce1a8e7daf7fdf (diff)
parent66fef08f7d5267b2312c4b48a6d2957d2d414105 (diff)
Merge branch 'sched-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (46 commits) sched: Add comments to find_busiest_group() function sched: Refactor the power savings balance code sched: Optimize the !power_savings_balance during fbg() sched: Create a helper function to calculate imbalance sched: Create helper to calculate small_imbalance in fbg() sched: Create a helper function to calculate sched_domain stats for fbg() sched: Define structure to store the sched_domain statistics for fbg() sched: Create a helper function to calculate sched_group stats for fbg() sched: Define structure to store the sched_group statistics for fbg() sched: Fix indentations in find_busiest_group() using gotos sched: Simple helper functions for find_busiest_group() sched: remove unused fields from struct rq sched: jiffies not printed per CPU sched: small optimisation of can_migrate_task() sched: fix typos in documentation sched: add avg_overlap decay x86, sched_clock(): mark variables read-mostly sched: optimize ttwu vs group scheduling sched: TIF_NEED_RESCHED -> need_reshed() cleanup sched: don't rebalance if attached on NULL domain ...
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
-rw-r--r--arch/x86/kernel/cpu/intel.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 24ff26a38ad..5fff00c70de 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -4,6 +4,7 @@
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/smp.h>
+#include <linux/sched.h>
#include <linux/thread_info.h>
#include <linux/module.h>
@@ -56,11 +57,16 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
/*
* c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
- * with P/T states and does not stop in deep C-states
+ * with P/T states and does not stop in deep C-states.
+ *
+ * It is also reliable across cores and sockets. (but not across
+ * cabinets - we turn it off in that case explicitly.)
*/
if (c->x86_power & (1 << 8)) {
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
+ set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
+ sched_clock_stable = 1;
}
}