On Mon, Mar 25, 2019 at 09:49:47AM -0400, Joel Fernandes wrote: > On Thu, Feb 14, 2019 at 07:19:29PM -0800, Alexei Starovoitov wrote: > > On Mon, Feb 11, 2019 at 09:35:59AM -0500, Joel Fernandes (Google) wrote: > > > Introduce in-kernel headers and other artifacts which are made available > > > as an archive through proc (/proc/kheaders.txz file). This archive makes > > > it possible to build kernel modules, run eBPF programs, and other > > > tracing programs that need to extend the kernel for tracing purposes > > > without any dependency on the file system having headers and build > > > artifacts. > > > > > > On Android and embedded systems, it is common to switch kernels but not > > > have kernel headers available on the file system. Raw kernel headers > > > also cannot be copied into the filesystem like they can be on other > > > distros, due to licensing and other issues. There's no linux-headers > > > package on Android. Further once a different kernel is booted, any > > > headers stored on the file system will no longer be useful. By storing > > > the headers as a compressed archive within the kernel, we can avoid these > > > issues that have been a hindrance for a long time. > > > > The set looks good to me and since the main use case is building bpf progs > > I can route it via bpf-next tree if there are no objections. > > Masahiro, could you please ack it? > > FYI, Masahiro's comments were all address by v5: > https://lore.kernel.org/patchwork/project/lkml/list/?series=387311 > > I believe aren't more outstanding concerns. Could we consider it for v5.2? Just to highlight the problem, today I booted v5.0 on an emulated Android device for some testing, that didn't have a set of prebuilt headers that we have been packaging on well known kernels, to get around this issue. This caused great pain and issues with what I was doing. I know me and many others really want this. With this I can boot an emulated Android device with IKCONFIG_PROC=y and run BCC with that that. Also I want to do the BCC side of the development, but first want to know if we can merge this upstream. Masahiro, I believe due diligence has been done in solidifying it as posted in the v5. Anything else we need to do here? Are you with the patches? thanks! - Joel
