On Thu, Oct 22, 2015 at 11:57:20AM -0700, Geoff Levand wrote: > Hi Dave, > > On Thu, 2015-10-22 at 11:17 +0800, Dave Young wrote: > > On 10/21/15 at 04:12pm, Geoff Levand wrote: > > > Add a new option --lite to kexec that allows for a fast reboot > > > by avoiding the purgatory integrity checks. This option is > > > intended for use by kexec based bootloaders that load a new > > > image and then immediately transfer control to it. > > > > I think Vivek was rejecting this --lite since kdump need the purgatory > > integrity checks. Ccing him. > > As stated, this is not intended for use by kdump. > > This is an optional feature. It does not remove the integrity > checks, but provides the user a way to bypass them if they so > desire. Why would somebody like to bypass these checks? > > > > It was reported that on some systems where purgatory is running > > > without caches enabled the sha256 calculations would take several > > > minutes. For bootloaders that just load a new image and > > > immediately jump into it the loss of the integrity check is worth > > > the increase in boot speed. Please consider. > > > > Pratyush reported the arm64 issue, he sent a patch to fix it with > > enabling cache for purgatory. I think the patch can fix the problem. > > Why not fix it? The fix is simple enough and it does not introduce > > complicate logic. > > This patch also is simple, and is architecture independent. I see this > feature as an improvement to kexec, not necessarily as a fix for that > problem. I am not sure why does somebody care if segments are being checked during transition or not? Thanks Vivek
