On Tue 10-12-19 20:55:57, Baoquan He wrote: [...] > Btw, as you said at above, I am confused by the '[KNL,BOOT]', what does > the 'BOOT' mean in the documentation of 'mem='? I checked all parameters > with 'BOOT', still don't get it clearly. This is a good question indeed. I have checked closer and this is what documentation says Documentation/admin-guide/kernel-parameters.rst " BOOT Is a boot loader parameter. Parameters denoted with BOOT are actually interpreted by the boot loader, and have no meaning to the kernel directly. " and that really doesn't fit, right? So I went to check the full history git tree just to get to 2.4.0-test5 and no explanation whatsoever. Fun, isn't it? ;) -- Michal Hocko SUSE Labs