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author | Martin KaFai Lau <kafai@fb.com> | 2017-04-14 20:30:28 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2017-04-17 20:55:52 +0300 |
commit | 9fd63d05f3e8476282cd8c484eb34d3f6be54f40 (patch) | |
tree | f3fb9ca5e7f8e8be6114a29ee23b17357522000d /scripts | |
parent | bf8db5d243a103ccd3f6d82a110e2302608e248c (diff) | |
download | linux-9fd63d05f3e8476282cd8c484eb34d3f6be54f40.tar.xz |
bpf: Allow bpf sample programs (*_user.c) to change bpf_map_def
The current bpf_map_def is statically defined during compile
time. This patch allows the *_user.c program to change it during
runtime. It is done by adding load_bpf_file_fixup_map() which
takes a callback. The callback will be called before creating
each map so that it has a chance to modify the bpf_map_def.
The current usecase is to change max_entries in map_perf_test.
It is interesting to test with a much bigger map size in
some cases (e.g. the following patch on bpf_lru_map.c).
However, it is hard to find one size to fit all testing
environment. Hence, it is handy to take the max_entries
as a cmdline arg and then configure the bpf_map_def during
runtime.
This patch adds two cmdline args. One is to configure
the map's max_entries. Another is to configure the max_cnt
which controls how many times a syscall is called.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions