X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fgetcpu.h;h=0a61941728a5de814ca5e5339d30fa945d3ed9fc;hb=273973c0f59628f3dc242fdf1a41d5f275b290e2;hp=104ba7601c6bc58598833d4e7acc9374e6262e4f;hpb=5ad63a1632792c8bc40fa5bc9f7f45f037a68032;p=lttng-ust.git

diff --git a/libringbuffer/getcpu.h b/libringbuffer/getcpu.h
index 104ba760..0a619417 100644
--- a/libringbuffer/getcpu.h
+++ b/libringbuffer/getcpu.h
@@ -20,9 +20,8 @@
  */
 
 #include <urcu/compiler.h>
-#include <sched.h>
 
-#ifdef UST_VALGRIND
+#ifdef LTTNG_UST_DEBUG_VALGRIND
 
 /*
  * Fallback on cpu 0 if liblttng-ust is build with Valgrind support.
@@ -37,6 +36,30 @@ int lttng_ust_get_cpu(void)
 
 #else
 
+/*
+ * sched_getcpu.
+ */
+#ifdef __linux__
+
+#ifdef __UCLIBC__
+#include <sys/syscall.h>
+#define __getcpu(cpu, node, cache)	syscall(__NR_getcpu, cpu, node, cache)
+/*
+ * If getcpu is not implemented in the kernel, use cpu 0 as fallback.
+ */
+static inline
+int lttng_ust_get_cpu(void)
+{
+	int cpu, ret;
+
+	ret = __getcpu(&cpu, NULL, NULL);
+	if (caa_unlikely(ret < 0))
+		return 0;
+	return c;
+}
+#else /* __UCLIBC__ */
+#include <sched.h>
+
 /*
  * If getcpu is not implemented in the kernel, use cpu 0 as fallback.
  */
@@ -50,6 +73,23 @@ int lttng_ust_get_cpu(void)
 		return 0;
 	return cpu;
 }
+#endif	/* __UCLIBC__ */
+
+#elif defined(__FreeBSD__)
+
+/*
+ * FreeBSD does not allow query of CPU ID. Always use CPU number 0, with
+ * the assocated performance degradation on SMP.
+ */
+static inline
+int lttng_ust_get_cpu(void)
+{
+	return 0;
+}
+
+#else
+#error "Please add support for your OS into liblttng-ust/compat.h."
+#endif
 
 #endif