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KernelDevice::aio_{submit,write,read}() are critical paths. calling cct->_conf->subsys.should_gather() multi-times is not optimal. the downside of this issue is that if the aio is printed, the size of buffer in PrebufferedStreambuf could be large if the number of iov is large, that could be a heavy load to the memory subsystem. Signed-off-by: Kefu Chai <kchai@redhat.com>
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