cb41154530
Jiri Olsa says:
====================
hi,
sending additional fix for symbol resolving in kprobe multi link
requested by Alexei and Andrii [1].
This speeds up bpftrace kprobe attachment, when using pure symbols
(3344 symbols) to attach:
Before:
# perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }'
...
6.5681 +- 0.0225 seconds time elapsed ( +- 0.34% )
After:
# perf stat -r 5 -e cycles ./src/bpftrace -e 'kprobe:x* { } i:ms:1 { exit(); }'
...
0.5661 +- 0.0275 seconds time elapsed ( +- 4.85% )
v6 changes:
- rewrote patch 1 changelog and fixed the line length [Christoph]
v5 changes:
- added acks [Masami]
- workaround in selftest for RCU warning by filtering out several
functions to attach
v4 changes:
- fix compile issue [kernel test robot]
- added acks [Andrii]
v3 changes:
- renamed kallsyms_lookup_names to ftrace_lookup_symbols
and moved it to ftrace.c [Masami]
- added ack [Andrii]
- couple small test fixes [Andrii]
v2 changes (first version [2]):
- removed the 2 seconds check [Alexei]
- moving/forcing symbols sorting out of kallsyms_lookup_names function [Alexei]
- skipping one array allocation and copy_from_user [Andrii]
- several small fixes [Masami,Andrii]
- build fix [kernel test robot]
thanks,
jirka
[1] https://lore.kernel.org/bpf/CAEf4BzZtQaiUxQ-sm_hH2qKPRaqGHyOfEsW96DxtBHRaKLoL3Q@mail.gmail.com/
[2] https://lore.kernel.org/bpf/20220407125224.310255-1-jolsa@kernel.org/
====================
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.