Hello, Anvin 1) use "memmap=exactmap", which remove all ranges include ram and non-ram range. So my first patch reserve the non-ram range. 2)don't use " memmap=exactmap ", so it reserve all ranges. But we only need non-ram, so we need kernel to remove RAM, just as my second patch.
Best Regards! Jun Zhang Inet: 8821-4273 Dir.Tel: 86-21-6116-4273 Email: jun.zh...@intel.com -----Original Message----- From: H. Peter Anvin [mailto:h...@zytor.com] Sent: Monday, November 05, 2012 10:39 AM To: Zhang, Jun Cc: Thomas Gleixner; Ingo Molnar; x...@kernel.org; Andrew Morton; Fleming, Matt; Paul Gortmaker; linux-kernel@vger.kernel.org Subject: Re: [PATCH] crash dump: don't delete non-E820_RAM during init On 11/05/2012 02:37 AM, Zhang, Jun wrote: > Hello, Gortmaker > I will modify my subject. Thanks! > > Hello, Anvin > from our three options, I think third option is better. But in 3) option, > there are two choose, 3.1) is like memmap=REMOVERAM, 3.2) is > memmap=CRASHKDUMP. > In 3.1) we maybe need ifdef/endif within the { } of the function (like > exactmap). > In 3.2) we can remove the ifdef/endif. > Which one is the better? Maybe you have a better solution, please share it. > Thanks! > > Next is our three option. > 1) my patch. > 2) modify kexec, only pass two parameters -- memmap=544K@64K > memmap=64964K@32768K, in kernel setup_memory_map, we can remove RAM > range. > 3) add extra optional, 3.1) like memmap=REMOVERAM > 3.2) like memmap=CRASHKDUMP > Again, 2 would be better because it is a localized change to kexec. If that works I don't see why there is any reason to change anything else. -hpa
