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memory: copy sparse backing in one traversal

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This commit is contained in:
nmzik
2026-10-07 23:17:53 +04:00
parent 7e011fa565
commit 45b6d2c597
2 changed files with 24 additions and 16 deletions
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src/kernel/memoryAddressSpace.inc
+6 -16
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@@ -258,28 +258,18 @@ public:
g_test_backing_read(vaddr, size);
}
#endif
const auto end = vaddr + size;
auto first = m_maps.lower_bound(vaddr);
if (first != m_maps.begin()) {
auto previous = std::prev(first);
const auto end = vaddr + size;
auto mapping = m_maps.lower_bound(vaddr);
if (mapping != m_maps.begin()) {
auto previous = std::prev(mapping);
if (previous->second.vaddr + previous->second.size > vaddr) {
first = previous;
}
}
for (auto mapping = first; mapping != m_maps.end() && mapping->second.vaddr < end;
++mapping) {
const auto& entry = mapping->second;
const auto start = std::max(vaddr, entry.vaddr);
const auto bytes = std::min(end, entry.vaddr + entry.size) - start;
if (!RangeOk(entry.backing_offset + start - entry.vaddr, bytes)) {
return false;
mapping = previous;
}
}
auto* destination = static_cast<uint8_t*>(data);
auto cursor = vaddr;
for (auto mapping = first; mapping != m_maps.end() && mapping->second.vaddr < end;
++mapping) {
for (; mapping != m_maps.end() && mapping->second.vaddr < end; ++mapping) {
const auto& entry = mapping->second;
const auto start = std::max(vaddr, entry.vaddr);
const auto bytes = std::min(end, entry.vaddr + entry.size) - start;