On November 11, 2020 3:27:58 PM GMT-03:00, Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> wrote: >On Wed, Nov 11, 2020 at 3:56 AM Arnaldo Carvalho de Melo ><acme@xxxxxxxxxx> wrote: >> >> Em Thu, Nov 05, 2020 at 09:25:49PM -0800, Andrii Nakryiko escreveu: >> > Add support for generating split BTF, in which there is a >designated base >> > BTF, containing a base set of types, and a split BTF, which extends >main BTF >> > with extra types, that can reference types and strings from the >main BTF. >> >> > This is going to be used to generate compact BTFs for kernel >modules, with >> > vmlinux BTF being a main BTF, which all kernel modules are based >off of. >> >> > These changes rely on patch set [0] to be present in libbpf >submodule. >> >> > [0] >https://patchwork.kernel.org/project/netdevbpf/list/?series=377859&state=* >> >> So, applied and added this: > >Awesome, thanks! Do you plan to release v1.19 soon? Yes > >> >> diff --git a/man-pages/pahole.1 b/man-pages/pahole.1 >> index 4b5e0a1bf5462b28..20ee91fc911d4b39 100644 >> --- a/man-pages/pahole.1 >> +++ b/man-pages/pahole.1 >> @@ -185,6 +185,10 @@ Do not encode VARs in BTF. >> .B \-\-btf_encode_force >> Ignore those symbols found invalid when encoding BTF. >> >> +.TP >> +.B \-\-btf_base >> +Path to the base BTF file, for instance: vmlinux when encoding >kernel module BTF information. >> + >> .TP >> .B \-l, \-\-show_first_biggest_size_base_type_member >> Show first biggest size base_type member. >> >> --------------- >> >> The entry for btf_encode/-J is missing, I'll add in a followup patch. >> >> Also I had to fixup ARGP_btf_base to 321 as I added this, to simplify >> the kernel scripts and Makefiles: >> >> $ pahole --numeric_version >> 118 >> $ > >Oh, this is nice! Can't really use it with Kbuild now due to backwards >compatibility, but maybe someday. Well, if it fails with --numeric_version, then it is old and the warning about the minimal version being v1.19 should be emitted :) - Arnaldo > >> >> Now to test this all by applying the kernel patches and the encoding >> module BTF, looking at it, etc. >> >> - Arnaldo >> > >[...] -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
