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* Increased the maximum profiling caller stack depth significantly.

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* Extended the profiling API by an option to record a variable number of
  samples per tick. The stack depth is used as a maximum.
* Added new option "-f" to the "profile" tool. When specified it
  increments the hit counts of all symbols in the full available caller
  stack. I.e. the resulting hit counts will approximate the total time
  spent in each function or any function directly or indirectly called
  by it. Thus "_start" and "main" will usually get 100% and leaf
  functions only what time has actually been spent in them.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27699 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2008-09-23 01:08:27 +00:00
parent 114c07e6e2
commit 0135e2e324
4 changed files with 150 additions and 38 deletions
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src/system/kernel/debug/user_debugger.cpp
+26 -8
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@@ -1217,16 +1217,25 @@ profiling_do_sample(bool& flushBuffer)
// get the samples
addr_t* returnAddresses = debugInfo.profile.samples
+ debugInfo.profile.sample_count;
if (stackDepth > 1) {
int32 count = arch_debug_get_stack_trace(returnAddresses, stackDepth, 1,
0, false);
if (debugInfo.profile.variable_stack_depth) {
// variable sample count per hit
*returnAddresses = arch_debug_get_stack_trace(returnAddresses + 1,
stackDepth - 1, 1, 0, false);
for (int32 i = count; i < stackDepth; i++)
returnAddresses[i] = 0;
} else
*returnAddresses = (addr_t)arch_debug_get_interrupt_pc();
debugInfo.profile.sample_count += *returnAddresses + 1;
} else {
// fixed sample count per hit
if (stackDepth > 1) {
int32 count = arch_debug_get_stack_trace(returnAddresses,
stackDepth, 1, 0, false);
debugInfo.profile.sample_count += stackDepth;
for (int32 i = count; i < stackDepth; i++)
returnAddresses[i] = 0;
} else
*returnAddresses = (addr_t)arch_debug_get_interrupt_pc();
debugInfo.profile.sample_count += stackDepth;
}
return true;
}
@@ -2214,6 +2223,8 @@ debug_nub_thread(void *)
replyPort = message.start_profiler.reply_port;
area_id sampleArea = message.start_profiler.sample_area;
int32 stackDepth = message.start_profiler.stack_depth;
bool variableStackDepth
= message.start_profiler.variable_stack_depth;
bigtime_t interval = max_c(message.start_profiler.interval,
B_DEBUG_MIN_PROFILE_INTERVAL);
status_t result = B_OK;
@@ -2227,6 +2238,11 @@ debug_nub_thread(void *)
else if (stackDepth > B_DEBUG_STACK_TRACE_DEPTH)
stackDepth = B_DEBUG_STACK_TRACE_DEPTH;
// provision for an extra entry per hit (for the number of
// samples), if variable stack depth
if (variableStackDepth)
stackDepth++;
// clone the sample area
area_info areaInfo;
if (result == B_OK)
@@ -2274,6 +2290,8 @@ debug_nub_thread(void *)
threadDebugInfo.profile.sample_count = 0;
threadDebugInfo.profile.dropped_ticks = 0;
threadDebugInfo.profile.stack_depth = stackDepth;
threadDebugInfo.profile.variable_stack_depth
= variableStackDepth;
threadDebugInfo.profile.buffer_full = false;
threadDebugInfo.profile.interval_left = interval;
threadDebugInfo.profile.installed_timer = NULL;