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BufferCache: Find direction of the stream buffer increase.
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@ -1464,19 +1464,27 @@ typename BufferCache<P>::OverlapResult BufferCache<P>::ResolveOverlaps(VAddr cpu
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overlap_ids.push_back(overlap_id);
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overlap.Pick();
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const VAddr overlap_cpu_addr = overlap.CpuAddr();
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if (overlap_cpu_addr < begin) {
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const bool expands_left = overlap_cpu_addr < begin;
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if (expands_left) {
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cpu_addr = begin = overlap_cpu_addr;
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}
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end = std::max(end, overlap_cpu_addr + overlap.SizeBytes());
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const VAddr overlap_end = overlap_cpu_addr + overlap.SizeBytes();
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const bool expands_right = overlap_end > end;
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if (overlap_end > end) {
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end = overlap_end;
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}
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stream_score += overlap.StreamScore();
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if (stream_score > STREAM_LEAP_THRESHOLD && !has_stream_leap) {
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// When this memory region has been joined a bunch of times, we assume it's being used
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// as a stream buffer. Increase the size to skip constantly recreating buffers.
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has_stream_leap = true;
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begin -= PAGE_SIZE * 256;
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cpu_addr = begin;
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end += PAGE_SIZE * 256;
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if (expands_right) {
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begin -= PAGE_SIZE * 256;
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cpu_addr = begin;
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}
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if (expands_left) {
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end += PAGE_SIZE * 256;
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}
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}
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}
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return OverlapResult{
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