Em Wed, Oct 05, 2022 at 10:59:10AM -0600, Bitweasil escreveu: > > On 10/5/22 06:20, Arnaldo Carvalho de Melo wrote: > > Em Tue, Oct 04, 2022 at 03:10:06PM -0600, Bitweasil escreveu: > > > When trying to extract the layout of kernel structures that should exist on > > > recent kernels from the Ubuntu debug kernel repo, I get the following error: > > > > > > die__process: DW_TAG_compile_unit, DW_TAG_type_unit or DW_TAG_partial_unit > > > expected got INVALID! > > > pahole: type 'mount' not found > > > > > > As far as I can tell, 'struct mount' should still exist - and I can pull > > > other structures out without trouble. The issue starts appearing somewhere > > > in the 5.15 kernel version - earlier kernels work exactly as expected and I > > > can extract the full offsets. > > > > > > https://elixir.bootlin.com/linux/v5.15.48/source/fs/mount.h indicates that > > > 'struct mount' still exists in the source, and it remains present into the > > > 6.0 kernel with no substantial changes. I can also produce the same response > > > with some of the other structures in that file - mountpoint, mnt_namespace, > > > and mnt_pcp all lead to the same error message. > > > > > > I've tried building pahole from head (Oct 4, 2022, e819d737) without any > > > changes to the behavior, and v1.21 and 1.24 both lead to the same results. > > Are you sure? The error message should be this in 1.24: > > > > because: > > > > if (tag == DW_TAG_skeleton_unit) { > > static bool warned; > > > > if (!warned) { > > fprintf(stderr, "WARNING: DW_TAG_skeleton_unit used, please look for a .dwo file and use it instead.\n" > > " A future version of pahole will support do this automagically.\n"); > > warned = true; > > } > > return 0; // so that other units can be processed > > } > > > > if (tag == DW_TAG_partial_unit) { > > static bool warned; > > > > if (!warned) { > > fprintf(stderr, "WARNING: DW_TAG_partial_unit used, some types will not be considered!\n" > > " Probably this was optimized using a tool like 'dwz'\n" > > " A future version of pahole will support this.\n"); > > warned = true; > > } > > return 0; // so that other units can be processed > > } > > > > if (tag != DW_TAG_compile_unit && tag != DW_TAG_type_unit) { > > fprintf(stderr, "%s: DW_TAG_compile_unit, DW_TAG_type_unit, DW_TAG_partial_unit or DW_TAG_skeleton_unit expected got %s (0x%x)!\n", > > __FUNCTION__, dwarf_tag_name(tag), tag); > > return -EINVAL; > > } > > Yes, I recognize the error text is slightly different in 1.24, but it was > the same error with either version. > > However, seeing that it worked for your system led to some experimentation, > and I believe the issue is one of either libdw or libelf versions. I did my > initial testing on Ubuntu 20.04, which has libdw/libelf 0.176-1.1build1 - > and building 1.24 and head from source fail on that. Humm, does it? I just tried building it on an ubuntu 20.04 container and it seems to work: root@0ed09bb9df94:~# cat /etc/os-release NAME="Ubuntu" VERSION="20.04.5 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.5 LTS" VERSION_ID="20.04" HOME_URL="https://www.ubuntu.com/"; SUPPORT_URL="https://help.ubuntu.com/"; BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"; PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"; VERSION_CODENAME=focal UBUNTU_CODENAME=focal root@0ed09bb9df94:~# cd /tmp root@0ed09bb9df94:/tmp# git clone git://git.kernel.org/pub/scm/devel/pahole/pahole.git Cloning into 'pahole'... remote: Enumerating objects: 11, done. remote: Counting objects: 100% (11/11), done. remote: Compressing objects: 100% (10/10), done. remote: Total 8364 (delta 3), reused 0 (delta 0), pack-reused 8353 Receiving objects: 100% (8364/8364), 2.08 MiB | 1.53 MiB/s, done. Resolving deltas: 100% (6025/6025), done. root@0ed09bb9df94:/tmp# cd pahole/ root@0ed09bb9df94:/tmp/pahole# mkdir build root@0ed09bb9df94:/tmp/pahole# cd build root@0ed09bb9df94:/tmp/pahole/build# cmake .. -- The C compiler identification is GNU 9.4.0 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Setting BUILD_SHARED_LIBS = ON -- Checking availability of DWARF and ELF development libraries -- Looking for dwfl_module_build_id in elf -- Looking for dwfl_module_build_id in elf - found -- Found dwarf.h header: /usr/include -- Found elfutils/libdw.h header: /usr/include -- Found libdw library: /usr/lib/x86_64-linux-gnu/libdw.so -- Found libelf library: /usr/lib/x86_64-linux-gnu/libelf.so -- Checking availability of DWARF and ELF development libraries - done -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11") -- Checking availability of argp library -- Assuming argp is in libc -- Checking availability of argp library - done -- Checking availability of obstack library -- Assuming obstack is in libc -- Checking availability of obstack library - done -- Submodule update Submodule 'lib/bpf' (https://github.com/libbpf/libbpf) registered for path 'lib/bpf' Cloning into '/tmp/pahole/lib/bpf'... Submodule path 'lib/bpf': checked out '645500dd7d2d6b5bb76e4c0375d597d4f0c4814e' -- Submodule update - done -- Performing Test HAVE_REALLOCARRAY_SUPPORT -- Performing Test HAVE_REALLOCARRAY_SUPPORT - Success -- Configuring done -- Generating done -- Build files have been written to: /tmp/pahole/build root@0ed09bb9df94:/tmp/pahole/build# cd .. root@0ed09bb9df94:/tmp/pahole# make -C build make: Entering directory '/tmp/pahole/build' make[1]: Entering directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target bpf make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 1%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/bpf.c.o [ 3%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/bpf_prog_linfo.c.o [ 5%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/btf.c.o [ 7%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/btf_dump.c.o [ 9%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/gen_loader.c.o [ 10%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/hashmap.c.o [ 12%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/libbpf.c.o [ 14%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/libbpf_errno.c.o [ 16%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/libbpf_probes.c.o [ 18%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/linker.c.o [ 20%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/netlink.c.o [ 21%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/nlattr.c.o [ 23%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/relo_core.c.o [ 25%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/ringbuf.c.o [ 27%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/str_error.c.o [ 29%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/strset.c.o [ 30%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/usdt.c.o [ 32%] Building C object CMakeFiles/bpf.dir/lib/bpf/src/xsk.c.o make[2]: Leaving directory '/tmp/pahole/build' [ 32%] Built target bpf make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target dwarves make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 34%] Building C object CMakeFiles/dwarves.dir/dwarves.c.o [ 36%] Building C object CMakeFiles/dwarves.dir/dwarves_fprintf.c.o [ 38%] Building C object CMakeFiles/dwarves.dir/gobuffer.c.o [ 40%] Building C object CMakeFiles/dwarves.dir/ctf_loader.c.o [ 41%] Building C object CMakeFiles/dwarves.dir/libctf.c.o [ 43%] Building C object CMakeFiles/dwarves.dir/btf_encoder.c.o [ 45%] Building C object CMakeFiles/dwarves.dir/btf_loader.c.o [ 47%] Building C object CMakeFiles/dwarves.dir/dwarf_loader.c.o [ 49%] Building C object CMakeFiles/dwarves.dir/dutil.c.o [ 50%] Building C object CMakeFiles/dwarves.dir/elf_symtab.c.o [ 52%] Building C object CMakeFiles/dwarves.dir/rbtree.c.o [ 54%] Linking C shared library libdwarves.so make[2]: Leaving directory '/tmp/pahole/build' [ 54%] Built target dwarves make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target syscse make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 56%] Building C object CMakeFiles/syscse.dir/syscse.c.o [ 58%] Linking C executable syscse make[2]: Leaving directory '/tmp/pahole/build' [ 58%] Built target syscse make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target codiff make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 60%] Building C object CMakeFiles/codiff.dir/codiff.c.o [ 61%] Linking C executable codiff make[2]: Leaving directory '/tmp/pahole/build' [ 61%] Built target codiff make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target dtagnames make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 63%] Building C object CMakeFiles/dtagnames.dir/dtagnames.c.o [ 65%] Linking C executable dtagnames make[2]: Leaving directory '/tmp/pahole/build' [ 65%] Built target dtagnames make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target scncopy make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 67%] Building C object CMakeFiles/scncopy.dir/scncopy.c.o [ 69%] Building C object CMakeFiles/scncopy.dir/elfcreator.c.o [ 70%] Linking C executable scncopy make[2]: Leaving directory '/tmp/pahole/build' [ 70%] Built target scncopy make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target dwarves_emit make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 72%] Building C object CMakeFiles/dwarves_emit.dir/dwarves_emit.c.o [ 74%] Linking C shared library libdwarves_emit.so make[2]: Leaving directory '/tmp/pahole/build' [ 74%] Built target dwarves_emit make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target dwarves_reorganize make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 76%] Building C object CMakeFiles/dwarves_reorganize.dir/dwarves_reorganize.c.o [ 78%] Linking C shared library libdwarves_reorganize.so make[2]: Leaving directory '/tmp/pahole/build' [ 78%] Built target dwarves_reorganize make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target ctracer make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 80%] Building C object CMakeFiles/ctracer.dir/ctracer.c.o [ 81%] Linking C executable ctracer make[2]: Leaving directory '/tmp/pahole/build' [ 81%] Built target ctracer make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target pdwtags make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 83%] Building C object CMakeFiles/pdwtags.dir/pdwtags.c.o [ 85%] Linking C executable pdwtags make[2]: Leaving directory '/tmp/pahole/build' [ 85%] Built target pdwtags make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target pahole make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 87%] Building C object CMakeFiles/pahole.dir/pahole.c.o [ 89%] Linking C executable pahole make[2]: Leaving directory '/tmp/pahole/build' [ 89%] Built target pahole make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target pfunct make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 90%] Building C object CMakeFiles/pfunct.dir/pfunct.c.o [ 92%] Linking C executable pfunct make[2]: Leaving directory '/tmp/pahole/build' [ 92%] Built target pfunct make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target pglobal make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 94%] Building C object CMakeFiles/pglobal.dir/pglobal.c.o [ 96%] Linking C executable pglobal make[2]: Leaving directory '/tmp/pahole/build' [ 96%] Built target pglobal make[2]: Entering directory '/tmp/pahole/build' Scanning dependencies of target prefcnt make[2]: Leaving directory '/tmp/pahole/build' make[2]: Entering directory '/tmp/pahole/build' [ 98%] Building C object CMakeFiles/prefcnt.dir/prefcnt.c.o [100%] Linking C executable prefcnt make[2]: Leaving directory '/tmp/pahole/build' [100%] Built target prefcnt make[1]: Leaving directory '/tmp/pahole/build' make: Leaving directory '/tmp/pahole/build' root@0ed09bb9df94:/tmp/pahole# build/pahole --version v1.24 root@0ed09bb9df94:/tmp/pahole# git log --oneline -5 e819d73 (HEAD -> master, origin/master, origin/HEAD) pahole: Add "btf" to the format-path option man page f01e5f3 dwarf_loader: Support DW_TAG_label outside DW_TAG_lexblock b841207 pahole: Allow --compile to work with DWARF in addition to with BTF 6fdb014 dwarves: support DW_TAG_atomic_type d750714 (origin/nex) emit: Don't mark a enum with nr_members == 0 as printed, its just a fwd decl root@0ed09bb9df94:/tmp/pahole# root@0ed09bb9df94:/tmp/pahole# dpkg -l | egrep libdw\|elf ii libdw-dev:amd64 0.176-1.1build1 amd64 libdw1 development libraries and header files ii libdw1:amd64 0.176-1.1build1 amd64 library that provides access to the DWARF debug information ii libelf-dev:amd64 0.176-1.1build1 amd64 libelf1 development libraries and header files ii libelf1:amd64 0.176-1.1build1 amd64 library to read and write ELF files root@0ed09bb9df94:/tmp/pahole# - Arnaldo > If I add the "-F btf" flag, v1.21 on 20.04 is able to get the structure. Cool. > However, on Ubuntu 22.04, with libdw/libelf 0.186-1build1, I get the > expected results without "-F btf", even with pahole v1.22. Sure, there it manages to get it from DWARF, no need to get it from BTF, albeit the later is much faster to process. > This gives me several options that resolve the issue usefully - thank you > for your prompt response and testing! No problem, thanks for the report. > -Bit > > > But its strange, there are no units other than DW_TAG_compile_unit in > > that vmlinux file: > > > > ⬢[acme@toolbox boot]$ readelf -wi vmlinux-5.15.0-48-generic | grep 'DW_TAG_.*_unit' | grep -v DW_TAG_compile_unit > > ⬢[acme@toolbox boot]$ > > > Steps to reproduce (warning, will take ~10GB - the unzipped kernel debug > > > symbols are rather large): > > > cd /tmp > > > wget http://ddebs.ubuntu.com/pool/main/l/linux/linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > > ar x linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > > tar -xf data.tar.xz > > > cd usr/lib/debug/boot > > > pahole -C mount vmlinux-5.15.0-48-generic > > > die__process: DW_TAG_compile_unit, DW_TAG_type_unit or DW_TAG_partial_unit > > > expected got INVALID! > > > pahole: type 'mount' not found > > > Any suggestions on how to resolve this? I'm not familiar enough with the > > > various debug formats to know how to troubleshoot beyond this point right > > > now. > > Works for me: > > > > ⬢[acme@toolbox pahole]$ wget http://ddebs.ubuntu.com/pool/main/l/linux/linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > --2022-10-05 09:11:56-- http://ddebs.ubuntu.com/pool/main/l/linux/linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > Resolving ddebs.ubuntu.com (ddebs.ubuntu.com)... 185.125.190.17, 91.189.91.48, 91.189.91.49, ... > > Connecting to ddebs.ubuntu.com (ddebs.ubuntu.com)|185.125.190.17|:80... connected. > > HTTP request sent, awaiting response... 200 OK > > Length: 1055842672 (1007M) [application/vnd.debian.binary-package] > > Saving to: ‘linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb’ > > > > linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.dde 100%[===================================================================================================================================================================>] 1007M 13.3MB/s in 74s > > > > 2022-10-05 09:13:11 (13.5 MB/s) - ‘linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb’ saved [1055842672/1055842672] > > > > ⬢[acme@toolbox pahole]$ mkdir ubuntu-kernel > > ⬢[acme@toolbox pahole]$ mv linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb ubuntu-kernel > > ⬢[acme@toolbox pahole]$ cd ubuntu-kernel > > ⬢[acme@toolbox ubuntu-kernel]$ ls -la > > total 1031148 > > drwxr-xr-x. 1 acme acme 138 Oct 5 09:13 . > > drwxrwxr-x. 1 acme acme 5074 Oct 5 09:13 .. > > -rw-r--r--. 1 acme acme 1055842672 Aug 31 08:39 linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > ⬢[acme@toolbox ubuntu-kernel]$ ar x linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > ⬢[acme@toolbox ubuntu-kernel]$ ls -la > > total 2062252 > > drwxr-xr-x. 1 acme acme 214 Oct 5 09:13 . > > drwxrwxr-x. 1 acme acme 5074 Oct 5 09:13 .. > > -rw-r--r--. 1 acme acme 155352 Oct 5 09:13 control.tar.xz > > -rw-r--r--. 1 acme acme 1055687128 Oct 5 09:13 data.tar.xz > > -rw-r--r--. 1 acme acme 4 Oct 5 09:13 debian-binary > > -rw-r--r--. 1 acme acme 1055842672 Aug 31 08:39 linux-image-unsigned-5.15.0-48-generic-dbgsym_5.15.0-48.54_amd64.ddeb > > ⬢[acme@toolbox ubuntu-kernel]$ tar -xf data.tar.xz > > ⬢[acme@toolbox ubuntu-kernel]$ cd usr/lib/debug/boot > > ⬢[acme@toolbox boot]$ ls -la > > total 719136 > > drwxr-xr-x. 1 acme acme 50 Aug 26 06:12 . > > drwxr-xr-x. 1 acme acme 14 Oct 5 09:13 .. > > -rw-r--r--. 1 acme acme 736393784 Aug 26 06:12 vmlinux-5.15.0-48-generic > > ⬢[acme@toolbox boot]$ ls -la > > total 719136 > > drwxr-xr-x. 1 acme acme 50 Aug 26 06:12 . > > drwxr-xr-x. 1 acme acme 14 Oct 5 09:13 .. > > -rw-r--r--. 1 acme acme 736393784 Aug 26 06:12 vmlinux-5.15.0-48-generic > > ⬢[acme@toolbox boot]$ pahole -C mount vmlinux-5.15.0-48-generic > > struct mount { > > struct hlist_node mnt_hash; /* 0 16 */ > > struct mount * mnt_parent; /* 16 8 */ > > struct dentry * mnt_mountpoint; /* 24 8 */ > > struct vfsmount mnt; /* 32 32 */ > > /* --- cacheline 1 boundary (64 bytes) --- */ > > union { > > struct callback_head mnt_rcu __attribute__((__aligned__(8))); /* 64 16 */ > > struct llist_node mnt_llist; /* 64 8 */ > > } __attribute__((__aligned__(8))); /* 64 16 */ > > struct mnt_pcp * mnt_pcp; /* 80 8 */ > > struct list_head mnt_mounts; /* 88 16 */ > > struct list_head mnt_child; /* 104 16 */ > > struct list_head mnt_instance; /* 120 16 */ > > /* --- cacheline 2 boundary (128 bytes) was 8 bytes ago --- */ > > const char * mnt_devname; /* 136 8 */ > > struct list_head mnt_list; /* 144 16 */ > > struct list_head mnt_expire; /* 160 16 */ > > struct list_head mnt_share; /* 176 16 */ > > /* --- cacheline 3 boundary (192 bytes) --- */ > > struct list_head mnt_slave_list; /* 192 16 */ > > struct list_head mnt_slave; /* 208 16 */ > > struct mount * mnt_master; /* 224 8 */ > > struct mnt_namespace * mnt_ns; /* 232 8 */ > > struct mountpoint * mnt_mp; /* 240 8 */ > > union { > > struct hlist_node mnt_mp_list; /* 248 16 */ > > struct hlist_node mnt_umount; /* 248 16 */ > > }; /* 248 16 */ > > /* --- cacheline 4 boundary (256 bytes) was 8 bytes ago --- */ > > struct list_head mnt_umounting; /* 264 16 */ > > struct fsnotify_mark_connector * mnt_fsnotify_marks; /* 280 8 */ > > __u32 mnt_fsnotify_mask; /* 288 4 */ > > int mnt_id; /* 292 4 */ > > int mnt_group_id; /* 296 4 */ > > int mnt_expiry_mark; /* 300 4 */ > > struct hlist_head mnt_pins; /* 304 8 */ > > struct hlist_head mnt_stuck_children; /* 312 8 */ > > > > /* size: 320, cachelines: 5, members: 27 */ > > /* forced alignments: 1 */ > > } __attribute__((__aligned__(8))); > > > > ⬢[acme@toolbox boot]$ pahole --version > > v1.24 > > ⬢[acme@toolbox boot]$ > > > > And it even has BTF info, which makes processing much faster but without > > some attributes: > > > > ⬢[acme@toolbox boot]$ readelf -SW vmlinux-5.15.0-48-generic | grep -i btf > > [28] .BTF PROGBITS ffffffff8279d1e0 199d1e0 4ef6b2 00 A 0 0 1 > > [29] .BTF_ids PROGBITS ffffffff82c8c894 1e8c894 0005e8 00 A 0 0 1 > > ⬢[acme@toolbox boot]$ > > > > ⬢[acme@toolbox boot]$ pahole -F btf -C mount vmlinux-5.15.0-48-generic > > struct mount { > > struct hlist_node mnt_hash; /* 0 16 */ > > struct mount * mnt_parent; /* 16 8 */ > > struct dentry * mnt_mountpoint; /* 24 8 */ > > struct vfsmount mnt; /* 32 32 */ > > /* --- cacheline 1 boundary (64 bytes) --- */ > > union { > > struct callback_head mnt_rcu; /* 64 16 */ > > struct llist_node mnt_llist; /* 64 8 */ > > }; /* 64 16 */ > > struct mnt_pcp * mnt_pcp; /* 80 8 */ > > struct list_head mnt_mounts; /* 88 16 */ > > struct list_head mnt_child; /* 104 16 */ > > struct list_head mnt_instance; /* 120 16 */ > > /* --- cacheline 2 boundary (128 bytes) was 8 bytes ago --- */ > > const char * mnt_devname; /* 136 8 */ > > struct list_head mnt_list; /* 144 16 */ > > struct list_head mnt_expire; /* 160 16 */ > > struct list_head mnt_share; /* 176 16 */ > > /* --- cacheline 3 boundary (192 bytes) --- */ > > struct list_head mnt_slave_list; /* 192 16 */ > > struct list_head mnt_slave; /* 208 16 */ > > struct mount * mnt_master; /* 224 8 */ > > struct mnt_namespace * mnt_ns; /* 232 8 */ > > struct mountpoint * mnt_mp; /* 240 8 */ > > union { > > struct hlist_node mnt_mp_list; /* 248 16 */ > > struct hlist_node mnt_umount; /* 248 16 */ > > }; /* 248 16 */ > > /* --- cacheline 4 boundary (256 bytes) was 8 bytes ago --- */ > > struct list_head mnt_umounting; /* 264 16 */ > > struct fsnotify_mark_connector * mnt_fsnotify_marks; /* 280 8 */ > > __u32 mnt_fsnotify_mask; /* 288 4 */ > > int mnt_id; /* 292 4 */ > > int mnt_group_id; /* 296 4 */ > > int mnt_expiry_mark; /* 300 4 */ > > struct hlist_head mnt_pins; /* 304 8 */ > > struct hlist_head mnt_stuck_children; /* 312 8 */ > > > > /* size: 320, cachelines: 5, members: 27 */ > > }; > > > > ⬢[acme@toolbox boot]$ -- - Arnaldo
