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Alexei Starovoitov
1afbcd9466
Jiri Olsa says:
====================
this patchset adds trampoline and dispatcher objects
to be visible in /proc/kallsyms.
$ sudo cat /proc/kallsyms | tail -20
...
ffffffffa050f000 t bpf_prog_5a2b06eab81b8f51 [bpf]
ffffffffa0511000 t bpf_prog_6deef7357e7b4530 [bpf]
ffffffffa0542000 t bpf_trampoline_13832 [bpf]
ffffffffa0548000 t bpf_prog_96f1b5bf4e4cc6dc_mutex_lock [bpf]
ffffffffa0572000 t bpf_prog_d1c63e29ad82c4ab_bpf_prog1 [bpf]
ffffffffa0585000 t bpf_prog_e314084d332a5338__dissect [bpf]
ffffffffa0587000 t bpf_prog_59785a79eac7e5d2_mutex_unlock [bpf]
ffffffffa0589000 t bpf_prog_d0db6e0cac050163_mutex_lock [bpf]
ffffffffa058d000 t bpf_prog_d8f047721e4d8321_bpf_prog2 [bpf]
ffffffffa05df000 t bpf_trampoline_25637 [bpf]
ffffffffa05e3000 t bpf_prog_d8f047721e4d8321_bpf_prog2 [bpf]
ffffffffa05e5000 t bpf_prog_3b185187f1855c4c [bpf]
ffffffffa05e7000 t bpf_prog_d8f047721e4d8321_bpf_prog2 [bpf]
ffffffffa05eb000 t bpf_prog_93cebb259dd5c4b2_do_sys_open [bpf]
ffffffffa0677000 t bpf_dispatcher_xdp [bpf]
v5 changes:
- keeping just 1 bpf_tree for all the objects and adding flag
to recognize bpf_objects when searching for exception tables [Alexei]
- no need for is_bpf_image_address call in kernel_text_address [Alexei]
- removed the bpf_image tree, because it's no longer needed
v4 changes:
- add trampoline and dispatcher to kallsyms once the it's allocated [Alexei]
- omit the symbols sorting for kallsyms [Alexei]
- small title change in one patch [Song]
- some function renames:
bpf_get_prog_name to bpf_prog_ksym_set_name
bpf_get_prog_addr_region to bpf_prog_ksym_set_addr
- added acks to changelogs
- I checked and there'll be conflict on perftool side with
upcoming changes from Adrian Hunter (text poke events),
so I think it's better if Arnaldo takes the perf changes
via perf tree and we will solve all conflicts there
v3 changes:
- use container_of directly in bpf_get_ksym_start [Daniel]
- add more changelog explanations for ksym addresses [Daniel]
v2 changes:
- omit extra condition in __bpf_ksym_add for sorting code (Andrii)
- rename bpf_kallsyms_tree_ops to bpf_ksym_tree (Andrii)
- expose only executable code in kallsyms (Andrii)
- use full trampoline key as its kallsyms id (Andrii)
- explained the BPF_TRAMP_REPLACE case (Andrii)
- small format changes in bpf_trampoline_link_prog/bpf_trampoline_unlink_prog (Andrii)
- propagate error value in bpf_dispatcher_update and update kallsym if it's successful (Andrii)
- get rid of __always_inline for bpf_ksym_tree callbacks (Andrii)
- added KSYMBOL notification for bpf_image add/removal
- added perf tools changes to properly display trampoline/dispatcher
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.