bpf: populate the per-cpu insertions/deletions counters for hashmaps

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Initialize and utilize the per-cpu insertions/deletions counters for hash-based
maps. Non-trivial changes only apply to the preallocated maps for which the
{inc,dec}_elem_count functions are not called, as there's no need in counting
elements to sustain proper map operations.

To increase/decrease percpu counters for preallocated maps we add raw calls to
the bpf_map_{inc,dec}_elem_count functions so that the impact is minimal. For
dynamically allocated maps we add corresponding calls to the existing
{inc,dec}_elem_count functions.

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Link: https://lore.kernel.org/r/20230706133932.45883-4-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Anton Protopopov 2023-07-06 13:39:30 +00:00 • committed by Alexei Starovoitov

parent 803370d3d3

commit 9bc421b6be

1 changed files with 20 additions and 2 deletions

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kernel/bpf/hashtab.c

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