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由 Blue Swirl 提交于
Report from pahole on amd64 host: struct ESPState { SysBusDevice busdev; /* 0 5648 */ /* --- cacheline 88 boundary (5632 bytes) was 16 bytes ago --- */ uint32_t it_shift; /* 5648 4 */ /* XXX 4 bytes hole, try to pack */ qemu_irq irq; /* 5656 8 */ uint8_t rregs[16]; /* 5664 16 */ uint8_t wregs[16]; /* 5680 16 */ /* --- cacheline 89 boundary (5696 bytes) --- */ int32_t ti_size; /* 5696 4 */ uint32_t ti_rptr; /* 5700 4 */ uint32_t ti_wptr; /* 5704 4 */ uint8_t ti_buf[16]; /* 5708 16 */ uint32_t status; /* 5724 4 */ uint32_t dma; /* 5728 4 */ /* XXX 4 bytes hole, try to pack */ SCSIBus bus; /* 5736 2120 */ /* --- cacheline 122 boundary (7808 bytes) was 48 bytes ago --- */ SCSIDevice * current_dev; /* 7856 8 */ SCSIRequest * current_req; /* 7864 8 */ /* --- cacheline 123 boundary (7872 bytes) --- */ uint8_t cmdbuf[16]; /* 7872 16 */ uint32_t cmdlen; /* 7888 4 */ uint32_t do_cmd; /* 7892 4 */ uint32_t dma_left; /* 7896 4 */ uint32_t dma_counter; /* 7900 4 */ uint8_t * async_buf; /* 7904 8 */ uint32_t async_len; /* 7912 4 */ /* XXX 4 bytes hole, try to pack */ ESPDMAMemoryReadWriteFunc dma_memory_read; /* 7920 8 */ ESPDMAMemoryReadWriteFunc dma_memory_write; /* 7928 8 */ /* --- cacheline 124 boundary (7936 bytes) --- */ void * dma_opaque; /* 7936 8 */ int dma_enabled; /* 7944 4 */ /* XXX 4 bytes hole, try to pack */ void (*dma_cb)(ESPState *); /* 7952 8 */ /* size: 7960, cachelines: 125 */ /* sum members: 7944, holes: 4, sum holes: 16 */ /* last cacheline: 24 bytes */ }; /* definitions: 1 */ Fix by rearranging the structure to avoid padding. Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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