From af0335d2926e1c597c247956cd608b6e8c9d6463 Mon Sep 17 00:00:00 2001 From: Joe Stringer Date: Sat, 22 Apr 2023 10:20:53 -0700 Subject: 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 Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20230422172054.3355436-1-joe@isovalent.com --- Documentation/bpf/map_hash.rst | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'Documentation') 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 ===== -- cgit