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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/resources/peak_gpu_memory_tracker_util.h"
#include "base/notreached.h"
namespace viz {
namespace {
// Counters to help generate sequence number, which is the unique identifier for
// each PeakGpuMemoryTrackerImpl, depending on the process they've been created
// from.
uint32_t sequence_num_generator_browser = 0;
uint32_t sequence_num_generator_gpu = 0;
} // namespace
uint32_t GetNextSequenceNumber(SequenceLocation location) {
// Sequence numbers for PeakGpuMemoryTrackers created in different locations
// must never return overlapping numbers.
switch (location) {
case SequenceLocation::kBrowserProcess:
// Browser process uses even numbers.
return sequence_num_generator_browser++ << 1;
case SequenceLocation::kGpuProcess:
// GPU process uses odd numbers.
return ((sequence_num_generator_gpu++ << 1) | 1);
}
NOTREACHED();
}
void SetSequenceNumberGeneratorForTesting(uint32_t sequence_num_generator,
SequenceLocation location) {
if (location == SequenceLocation::kBrowserProcess) {
sequence_num_generator_browser = sequence_num_generator;
} else {
sequence_num_generator_gpu = sequence_num_generator;
}
}
SequenceLocation GetPeakMemoryUsageRequestLocation(uint32_t sequence_num) {
if (sequence_num & 1) {
// Odd |sequence_num| implies that the request for PeakMemoryUsage is from
// the VizCompositor thread.
return SequenceLocation::kGpuProcess;
}
return SequenceLocation::kBrowserProcess;
}
} // namespace viz
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