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authorLin Ming <ming.m.lin@intel.com>2011-03-03 05:34:50 +0300
committerIngo Molnar <mingo@elte.hu>2011-03-05 09:12:16 +0300
commit6909262429b70a162e9e7053672cfd8024c9275d (patch)
treeee701491a7cd2a1fb685f18b379a6cd4d450b395 /arch/x86/include/asm/smp.h
parente994d7d23a0bae34cd28834e85522ed4e782faf7 (diff)
downloadlinux-6909262429b70a162e9e7053672cfd8024c9275d.tar.xz
perf: Avoid the percore allocations if the CPU is not HT capable
Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1299119690-13991-5-git-send-email-ming.m.lin@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/smp.h')
-rw-r--r--arch/x86/include/asm/smp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 1f4695136776..c1bbfa89a0e2 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -17,10 +17,20 @@
#endif
#include <asm/thread_info.h>
#include <asm/cpumask.h>
+#include <asm/cpufeature.h>
extern int smp_num_siblings;
extern unsigned int num_processors;
+static inline bool cpu_has_ht_siblings(void)
+{
+ bool has_siblings = false;
+#ifdef CONFIG_SMP
+ has_siblings = cpu_has_ht && smp_num_siblings > 1;
+#endif
+ return has_siblings;
+}
+
DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
DECLARE_PER_CPU(u16, cpu_llc_id);