Em Tue, Mar 28, 2023 at 12:33:32PM +1100, Stephen Rothwell escreveu: > Hi Arnaldo, > > Just a few datapoints: > > My build machine (Debian Testing PowerpcLE, not quite the latest > kernel): > On Thu, 23 Mar 2023 10:27:36 -0300 Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote: > > Which improves a bit the situation. > > > > We could check if bpftool is available and if not, suggest installing > > it. > > $ ls -l /usr/sbin/bpftool > -rwxr-xr-x 1 root root 790504 Mar 6 02:33 /usr/sbin/bpftool > > > If it is available, we could check if /sys/kernel/bpf/ is available, if > > not suggest using a kernel with CONFIG_DEBUG_INFO_BTF=y, as most distros > > have by now. The config files you used don't match the running kernels > $ uname -a > Linux zz1 6.0.0-5-powerpc64le #1 SMP Debian 6.0.10-2 (2022-12-01) ppc64le GNU/Linux > $ ls -l /sys/kernel/bpf/ > ls: cannot access '/sys/kernel/bpf/': No such file or directory > $ grep CONFIG_DEBUG_INFO_BTF /boot/config-6.0.0-5-powerpc64le > # CONFIG_DEBUG_INFO_BTF is not set > > And in the latest powerpc64le kernel: > > $ grep CONFIG_DEBUG_INFO_BTF /boot/config-6.1.0-5-powerpc64le > # CONFIG_DEBUG_INFO_BTF is not set > > Debian Testing arm64, not quite the latest kernel: > > $ uname -a > Linux oak 6.1.0-5-arm64 #1 SMP Debian 6.1.12-1 (2023-02-15) aarch64 GNU/Linux > $ ls -l /sys/kernel/bpf/ > ls: cannot access '/sys/kernel/bpf/': No such file or directory > $ grep CONFIG_DEBUG_INFO_BTF /boot/config-6.1.0-5-arm64 > CONFIG_DEBUG_INFO_BTF=y > CONFIG_DEBUG_INFO_BTF_MODULES=y The running kernel is 6.1.12-1, the .config is 6.1.0-5 > Debian Testing amd64, the latest kernel: > > $ uname -a > Linux pine 6.1.0-6-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.15-1 (2023-03-05) x86_64 GNU/Linux > $ ls -l /sys/kernel/bpf/ > ls: cannot access '/sys/kernel/bpf/': No such file or directory > $ grep CONFIG_DEBUG_INFO_BTF /boot/config-6.1.0-6-amd64 > CONFIG_DEBUG_INFO_BTF=y > CONFIG_DEBUG_INFO_BTF_MODULES=y Ditto, 6.1.15-1 != 6.1.0-6 > > Debian Stable amd64, the latest kernel: > > $ uname -a > Linux gimli 5.10.0-21-cloud-amd64 #1 SMP Debian 5.10.162-1 (2023-01-21) x86_64 GNU/Linux > $ ls -l /sys/kernel/bpf/ > ls: cannot access '/sys/kernel/bpf/': No such file or directory > $ grep CONFIG_DEBUG_INFO_BTF /boot/config-5.10.0-21-cloud-amd64 > CONFIG_DEBUG_INFO_BTF=y Ditto, 5.10.162-1 != 5.10.0-21-cloud Here: [acme@quaco pahole]$ grep CONFIG_DEBUG_INFO_BTF /boot/config-`uname -r` CONFIG_DEBUG_INFO_BTF=y CONFIG_DEBUG_INFO_BTF_MODULES=y [acme@quaco pahole]$ uname -r 6.1.18-100.fc36.x86_64 [acme@quaco pahole]$ [acme@quaco pahole]$ ls -la /sys/kernel/btf/vmlinux -r--r--r--. 1 root root 5499812 Mar 20 17:45 /sys/kernel/btf/vmlinux [acme@quaco pahole]$ ls -la /sys/kernel/btf/nfsv4 -r--r--r--. 1 root root 319948 Mar 28 16:46 /sys/kernel/btf/nfsv4 [acme@quaco pahole]$ lsmod | grep -w nfsv4 nfsv4 1085440 1 dns_resolver 16384 1 nfsv4 nfs 532480 2 nfsv4 sunrpc 704512 26 nfsd,rpcrdma,nfsv4,auth_rpcgss,lockd,rpcsec_gss_krb5,nfs_acl,nfs [acme@quaco pahole]$ ls -la /sys/kernel/btf/nfsd -r--r--r--. 1 root root 596066 Mar 28 16:46 /sys/kernel/btf/nfsd [acme@quaco pahole]$ ls -la /sys/kernel/btf/lockd -r--r--r--. 1 root root 180234 Mar 28 16:46 /sys/kernel/btf/lockd [acme@quaco pahole]$ > -- > Cheers, > Stephen Rothwell
