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cache the last entry of mapped blocks in memory_mapping() for better performance

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Nguyen Anh Quynh 2015-09-04 15:40:47 +08:00
parent fabbc0f4dc
commit d506b900eb
2 changed files with 11 additions and 1 deletions
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1
include/uc_priv.h
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@ -175,6 +175,7 @@ struct uc_struct {
bool block_full; bool block_full;
MemoryRegion **mapped_blocks; MemoryRegion **mapped_blocks;
uint32_t mapped_block_count; uint32_t mapped_block_count;
uint32_t mapped_block_cache_index;
void *qemu_thread_data; // to support cross compile to Windows (qemu-thread-win32.c) void *qemu_thread_data; // to support cross compile to Windows (qemu-thread-win32.c)
uint32_t target_page_size; uint32_t target_page_size;
uint32_t target_page_align; uint32_t target_page_align;

11
uc.c
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@ -798,9 +798,18 @@ MemoryRegion *memory_mapping(struct uc_struct* uc, uint64_t address)
{ {
unsigned int i; unsigned int i;
// try with the cache index first
i = uc->mapped_block_cache_index;
if (address >= uc->mapped_blocks[i]->addr && address < uc->mapped_blocks[i]->end)
return uc->mapped_blocks[i];
for(i = 0; i < uc->mapped_block_count; i++) { for(i = 0; i < uc->mapped_block_count; i++) {
if (address >= uc->mapped_blocks[i]->addr && address < uc->mapped_blocks[i]->end) if (address >= uc->mapped_blocks[i]->addr && address < uc->mapped_blocks[i]->end) {
// cache this index for the next query
uc->mapped_block_cache_index = i;
return uc->mapped_blocks[i]; return uc->mapped_blocks[i];
}
} }
// not found // not found