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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "components/startup_metric_utils/browser/startup_metric_utils.h" | 5 #include "components/startup_metric_utils/browser/startup_metric_utils.h" |
6 | 6 |
7 #include <stddef.h> | 7 #include <stddef.h> |
8 | 8 |
9 #include <memory> | 9 #include <memory> |
10 | 10 |
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309 // also the time taken to synchronously resolve base::Time::Now() and | 309 // also the time taken to synchronously resolve base::Time::Now() and |
310 // base::TimeTicks::Now() at play, but in practice it is pretty much instant | 310 // base::TimeTicks::Now() at play, but in practice it is pretty much instant |
311 // compared to multi-seconds startup timings. | 311 // compared to multi-seconds startup timings. |
312 base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) { | 312 base::TimeTicks StartupTimeToTimeTicks(const base::Time& time) { |
313 // First get a base which represents the same point in time in both units. | 313 // First get a base which represents the same point in time in both units. |
314 // Bump the priority of this thread while doing this as the wall clock time it | 314 // Bump the priority of this thread while doing this as the wall clock time it |
315 // takes to resolve these two calls affects the precision of this method and | 315 // takes to resolve these two calls affects the precision of this method and |
316 // bumping the priority reduces the likelihood of a context switch interfering | 316 // bumping the priority reduces the likelihood of a context switch interfering |
317 // with this computation. | 317 // with this computation. |
318 | 318 |
319 // Enabling this logic on OS X causes a significant performance regression. | |
320 // https://crbug.com/601270 | |
321 #if !defined(OS_MACOSX) | |
322 static bool statics_initialized = false; | 319 static bool statics_initialized = false; |
323 | 320 |
324 base::ThreadPriority previous_priority = base::ThreadPriority::NORMAL; | 321 base::ThreadPriority previous_priority = base::ThreadPriority::NORMAL; |
325 if (!statics_initialized) { | 322 if (!statics_initialized) { |
326 previous_priority = base::PlatformThread::GetCurrentThreadPriority(); | 323 previous_priority = base::PlatformThread::GetCurrentThreadPriority(); |
327 base::PlatformThread::SetCurrentThreadPriority( | 324 base::PlatformThread::SetCurrentThreadPriority( |
328 base::ThreadPriority::DISPLAY); | 325 base::ThreadPriority::DISPLAY); |
329 } | 326 } |
330 #endif | |
331 | 327 |
332 static const base::Time time_base = base::Time::Now(); | 328 static const base::Time time_base = base::Time::Now(); |
333 static const base::TimeTicks trace_ticks_base = base::TimeTicks::Now(); | 329 static const base::TimeTicks trace_ticks_base = base::TimeTicks::Now(); |
334 | 330 |
335 #if !defined(OS_MACOSX) | |
336 if (!statics_initialized) { | 331 if (!statics_initialized) { |
337 base::PlatformThread::SetCurrentThreadPriority(previous_priority); | 332 base::PlatformThread::SetCurrentThreadPriority(previous_priority); |
338 } | 333 } |
339 statics_initialized = true; | 334 statics_initialized = true; |
340 #endif | |
341 | 335 |
342 // Then use the TimeDelta common ground between the two units to make the | 336 // Then use the TimeDelta common ground between the two units to make the |
343 // conversion. | 337 // conversion. |
344 const base::TimeDelta delta_since_base = time_base - time; | 338 const base::TimeDelta delta_since_base = time_base - time; |
345 return trace_ticks_base - delta_since_base; | 339 return trace_ticks_base - delta_since_base; |
346 } | 340 } |
347 | 341 |
348 // Record time of main entry so it can be read from Telemetry performance tests. | 342 // Record time of main entry so it can be read from Telemetry performance tests. |
349 // TODO(jeremy): Remove once crbug.com/317481 is fixed. | 343 // TODO(jeremy): Remove once crbug.com/317481 is fixed. |
350 void RecordMainEntryTimeHistogram() { | 344 void RecordMainEntryTimeHistogram() { |
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747 | 741 |
748 base::TimeTicks MainEntryPointTicks() { | 742 base::TimeTicks MainEntryPointTicks() { |
749 return g_browser_main_entry_point_ticks.Get(); | 743 return g_browser_main_entry_point_ticks.Get(); |
750 } | 744 } |
751 | 745 |
752 StartupTemperature GetStartupTemperature() { | 746 StartupTemperature GetStartupTemperature() { |
753 return g_startup_temperature; | 747 return g_startup_temperature; |
754 } | 748 } |
755 | 749 |
756 } // namespace startup_metric_utils | 750 } // namespace startup_metric_utils |
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