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memory: optimize qemu_get_ram_ptr and qemu_ram_ptr_length

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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 <arei.gonglei@huawei.com>
Message-Id: <1455935721-8804-3-git-send-email-arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Gonglei 2016-02-20 10:35:20 +08:00 • committed by Paolo Bonzini
parent 58eaa2174e
commit 3655cb9c73
3 changed files with 31 additions and 21 deletions
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2
memory.c
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@ -1570,7 +1570,7 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr)
mr = mr->alias;
}
assert(mr->ram_addr != RAM_ADDR_INVALID);
ptr = qemu_get_ram_ptr(mr->ram_addr & TARGET_PAGE_MASK);
ptr = qemu_get_ram_ptr(mr->ram_block, mr->ram_addr & TARGET_PAGE_MASK);
rcu_read_unlock();
return ptr + offset;