On Mon, Feb 07, 2011 at 09:25:50AM -0500, Vivek Goyal wrote: > On Mon, Feb 07, 2011 at 01:30:54PM +0200, Ahmed S. Darwish wrote: > > > > Had to explore two C code files to make sense of the 'crashkernel=' > > kernel parameter values. Improve the situation. > > > > Did you look at Documentation/kdump/kdump.txt before looking into the > code. I thought kdump.txt explained the meaning of crashkernel= well. > > In case if it was not obivious that for further details look into > kdump.txt, I will suggest to add a line asking reader to look into > kdump.txt for more details. > Yes, I jumped to the code first :-) Here's a new patch with the link: (Also applicable over latest -rc3) ==> Complete the crashkernel= kernel parameter documentation. Signed-off-by: Ahmed S. Darwish <darwish.07 at gmail.com> --- diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 89835a4..050b0e5 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -545,16 +545,20 @@ and is between 256 and 4096 characters. It is defined in the file Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] - crashkernel=nn[KMG]@ss[KMG] - [KNL] Reserve a chunk of physical memory to - hold a kernel to switch to with kexec on panic. + crashkernel=size[KMG][@offset[KMG]] + [KNL] Using kexec, Linux can switch to a 'crash kernel' + upon panic. This parameter reserves the physical + memory region [offset, offset + size] for that kernel + image. If '@offset' is omitted, then a suitable offset + is selected automatically. Check + Documentation/kdump/kdump.txt for further details. crashkernel=range1:size1[,range2:size2,...][@offset] [KNL] Same as above, but depends on the memory in the running system. The syntax of range is start-[end] where start and end are both a memory unit (amount[KMG]). See also - Documentation/kdump/kdump.txt for a example. + Documentation/kdump/kdump.txt for an example. cs89x0_dma= [HW,NET] Format: <dma> > > Acked-by: Vivek Goyal <vgoyal at redhat.com> > thanks, -- Darwish http://darwish.07.googlepages.com
