On Wed, Aug 05, 2009 at 06:33:57AM -0700, Eric W. Biederman wrote: > Amerigo Wang <amwang@xxxxxxxxxx> writes: > > > This series of patch implements automatically reserved memory for crashkernel, > > by introducing a new boot option "crashkernel=auto". This idea is from Neil. > > > > In case of breaking user-space applications, it modifies this boot option after > > it decides how much memory should be reserved. > > > > On different arch, the threshold and reserved memory size is different. Please > > refer patch 7/7 which contains an update for the documentation. > > > > Note: This patchset was only tested on x86_64 with differernt memory sizes. > > This seems like a silly hard code. Especially for a feature distros don't > care enough about to implement a working initrd for. > > Has anyone bothered to justify those large amounts of memory? > Where does the 128M go? > > Please pardon me for being a cynic but I don't see the command line option > being the bottleneck for real users to make this work. > > Eric Lots of the impetus behind this results from a desire to have kexec configured and setup up during install. Having the kernel allocate a default size block of RAM lets you do that without the need for an interim reboot. You could of course boot the installer kernel with a crashkernel line pre-selected suppose, but then you have to go to the trouble of figuring that allocation size out each time. This gives you a nice convienent way to get a reasonable block of memory without the need to do all that extra work. Neil -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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