Adds AVX detection to CPU and records a histogram of Intel uArch Support

content/browser/gpu/gpu_process_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/gpu/gpu_process_host.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
 #include "base/threading/thread.h"
 #include "content/browser/browser_child_process_host_impl.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
@@ skipping 242 matching lines @@
   if (g_gpu_process_hosts[kind] && ValidateHost(g_gpu_process_hosts[kind]))
     return g_gpu_process_hosts[kind];
 
   if (cause == CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH)
     return NULL;
 
   static int last_host_id = 0;
   int host_id;
   host_id = ++last_host_id;
 
+#if defined(ARCH_CPU_X86_FAMILY)
+  base::CPU cpu;
+  int arch = 0;
+  if (cpu.has_sse())
+    arch = 1;

[apatrick_chromium, 2013/01/25 19:06:30]

nit: use an enum and comment that it must not be renumbered and that it has to
be kept in sync with histograms.xml.

+  if (cpu.has_sse2())
+    arch = 2;
+  if (cpu.has_sse3())
+    arch = 3;
+  if (cpu.has_ssse3())
+    arch = 4;
+  if (cpu.has_sse41())
+    arch = 5;
+  if (cpu.has_sse42())
+    arch = 6;
+  if (cpu.has_avx())
+    arch = 7;
+  UMA_HISTOGRAM_ENUMERATION("Platform.IntelMaxuArchSupport",
+                            arch,
+                            8);
+#endif // defined(ARCH_CPU_X86_FAMILY)
+
   UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLaunchCause",
                             cause,
                             CAUSE_FOR_GPU_LAUNCH_MAX_ENUM);
 
   GpuProcessHost* host = new GpuProcessHost(host_id, kind);
   if (host->Init())
     return host;
 
   delete host;
   return NULL;
@@ skipping 768 matching lines @@
 void GpuProcessHost::BlockLiveOffscreenContexts() {
   for (std::multiset<GURL>::iterator iter =
            urls_with_live_offscreen_contexts_.begin();
        iter != urls_with_live_offscreen_contexts_.end(); ++iter) {
     GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(
         *iter, GpuDataManagerImpl::DOMAIN_GUILT_UNKNOWN);
   }
 }
 
 }  // namespace content