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| author | Joe Stringer <joe@isovalent.com> | 2023-04-22 19:20:53 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-04-27 14:20:29 +0200 |
| commit | af0335d2926e1c597c247956cd608b6e8c9d6463 (patch) | |
| tree | 902b1fb1d7bf742946da1a72fa2d59955a8f7235 /Documentation/bpf | |
| parent | selftests/bpf: Add test case to assert precise scalar path pruning (diff) | |
| download | linux-af0335d2926e1c597c247956cd608b6e8c9d6463.tar.xz linux-af0335d2926e1c597c247956cd608b6e8c9d6463.zip | |
docs/bpf: Add table to describe LRU properties
Depending on the map type and flags for LRU, different properties are
global or percpu. Add a table to describe these.
Signed-off-by: Joe Stringer <joe@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20230422172054.3355436-1-joe@isovalent.com
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/map_hash.rst | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/bpf/map_hash.rst b/Documentation/bpf/map_hash.rst index 8669426264c6..1314dfc5e7e1 100644 --- a/Documentation/bpf/map_hash.rst +++ b/Documentation/bpf/map_hash.rst @@ -29,7 +29,16 @@ will automatically evict the least recently used entries when the hash table reaches capacity. An LRU hash maintains an internal LRU list that is used to select elements for eviction. This internal LRU list is shared across CPUs but it is possible to request a per CPU LRU list with -the ``BPF_F_NO_COMMON_LRU`` flag when calling ``bpf_map_create``. +the ``BPF_F_NO_COMMON_LRU`` flag when calling ``bpf_map_create``. The +following table outlines the properties of LRU maps depending on the a +map type and the flags used to create the map. + +======================== ========================= ================================ +Flag ``BPF_MAP_TYPE_LRU_HASH`` ``BPF_MAP_TYPE_LRU_PERCPU_HASH`` +======================== ========================= ================================ +**BPF_F_NO_COMMON_LRU** Per-CPU LRU, global map Per-CPU LRU, per-cpu map +**!BPF_F_NO_COMMON_LRU** Global LRU, global map Global LRU, per-cpu map +======================== ========================= ================================ Usage ===== |