Merge to Fedora kernel-2.6.17-1.2187_FC5 patched with stable patch-2.6.17.13-vs2...

[linux-2.6.git] / drivers / oprofile / cpu_buffer.c

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index fc4bc9b..a59878e 100644 (file)
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -6,6 +6,10 @@
  *
  * @author John Levon <levon@movementarian.org>
  *
+ * Modified by Aravind Menon for Xen
+ * These modifications are:
+ * Copyright (C) 2005 Hewlett-Packard Co.
+ *
  * Each CPU has a local buffer that stores PC value/event
  * pairs. We also log context switches when we notice them.
  * Eventually each CPU's buffer is processed into the global
@@ -34,6 +38,8 @@ static void wq_sync_buffer(void *);
 #define DEFAULT_TIMER_EXPIRE (HZ / 10)
 static int work_enabled;
 
+static int32_t current_domain = COORDINATOR_DOMAIN;
+
 void free_cpu_buffers(void)
 {
        int i;
@@ -57,7 +63,7 @@ int alloc_cpu_buffers(void)
                        goto fail;
  
                b->last_task = NULL;
-               b->last_is_kernel = -1;
+               b->last_cpu_mode = -1;
                b->tracing = 0;
                b->buffer_size = buffer_size;
                b->tail_pos = 0;
@@ -113,7 +119,7 @@ void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf)
         * collected will populate the buffer with proper
         * values to initialize the buffer
         */
-       cpu_buf->last_is_kernel = -1;
+       cpu_buf->last_cpu_mode = -1;
        cpu_buf->last_task = NULL;
 }
 
@@ -163,13 +169,13 @@ add_code(struct oprofile_cpu_buffer * buffer, unsigned long value)
  * because of the head/tail separation of the writer and reader
  * of the CPU buffer.
  *
- * is_kernel is needed because on some architectures you cannot
+ * cpu_mode is needed because on some architectures you cannot
  * tell if you are in kernel or user space simply by looking at
- * pc. We tag this in the buffer by generating kernel enter/exit
- * events whenever is_kernel changes
+ * pc. We tag this in the buffer by generating kernel/user (and xen)
+ *  enter events whenever cpu_mode changes
  */
 static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
-                     int is_kernel, unsigned long event)
+                     int cpu_mode, unsigned long event)
 {
        struct task_struct * task;
 
@@ -180,18 +186,20 @@ static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
                return 0;
        }
 
-       is_kernel = !!is_kernel;
+       WARN_ON(cpu_mode > CPU_MODE_XEN);
 
        task = current;
 
        /* notice a switch from user->kernel or vice versa */
-       if (cpu_buf->last_is_kernel != is_kernel) {
-               cpu_buf->last_is_kernel = is_kernel;
-               add_code(cpu_buf, is_kernel);
+       if (cpu_buf->last_cpu_mode != cpu_mode) {
+               cpu_buf->last_cpu_mode = cpu_mode;
+               add_code(cpu_buf, cpu_mode);
        }
-
+       
        /* notice a task switch */
-       if (cpu_buf->last_task != task) {
+       /* if not processing other domain samples */
+       if ((cpu_buf->last_task != task) &&
+           (current_domain == COORDINATOR_DOMAIN)) {
                cpu_buf->last_task = task;
                add_code(cpu_buf, (unsigned long)task);
        }
@@ -275,6 +283,25 @@ void oprofile_add_trace(unsigned long pc)
        add_sample(cpu_buf, pc, 0);
 }
 
+int oprofile_add_domain_switch(int32_t domain_id)
+{
+       struct oprofile_cpu_buffer * cpu_buf = &cpu_buffer[smp_processor_id()];
+
+       /* should have space for switching into and out of domain 
+          (2 slots each) plus one sample and one cpu mode switch */
+       if (((nr_available_slots(cpu_buf) < 6) && 
+            (domain_id != COORDINATOR_DOMAIN)) ||
+           (nr_available_slots(cpu_buf) < 2))
+               return 0;
+
+       add_code(cpu_buf, CPU_DOMAIN_SWITCH);
+       add_sample(cpu_buf, domain_id, 0);
+
+       current_domain = domain_id;
+
+       return 1;
+}
+
 /*
  * This serves to avoid cpu buffer overflow, and makes sure
  * the task mortuary progresses