From 3655cb9c7375a595a8051ec677c515b24d5c1fe6 Mon Sep 17 00:00:00 2001 From: Gonglei Date: Sat, 20 Feb 2016 10:35:20 +0800 Subject: memory: optimize qemu_get_ram_ptr and qemu_ram_ptr_length these two functions consume too much cpu overhead to find the RAMBlock by ram address. After this patch, we can pass the RAMBlock pointer to them so that they don't need to find the RAMBlock anymore most of the time. We can get better performance in address translation processing. Signed-off-by: Gonglei Message-Id: <1455935721-8804-3-git-send-email-arei.gonglei@huawei.com> Signed-off-by: Paolo Bonzini --- include/exec/memory.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/exec/memory.h') diff --git a/include/exec/memory.h b/include/exec/memory.h index 683be46cd0..34f21f1aed 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1391,7 +1391,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr, MemoryRegion *mr); MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, uint8_t *buf, int len); -void *qemu_get_ram_ptr(ram_addr_t addr); +void *qemu_get_ram_ptr(RAMBlock *ram_block, ram_addr_t addr); static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write) { @@ -1432,7 +1432,7 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs, mr = address_space_translate(as, addr, &addr1, &l, false); if (len == l && memory_access_is_direct(mr, false)) { addr1 += memory_region_get_ram_addr(mr); - ptr = qemu_get_ram_ptr(addr1); + ptr = qemu_get_ram_ptr(mr->ram_block, addr1); memcpy(buf, ptr, len); } else { result = address_space_read_continue(as, addr, attrs, buf, len, -- cgit v1.2.3