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Song Liu 792caccc45 bpf: Introduce BPF_F_PRESERVE_ELEMS for perf event array 
Currently, perf event in perf event array is removed from the array when
the map fd used to add the event is closed. This behavior makes it
difficult to the share perf events with perf event array.

Introduce perf event map that keeps the perf event open with a new flag
BPF_F_PRESERVE_ELEMS. With this flag set, perf events in the array are not
removed when the original map fd is closed. Instead, the perf event will
stay in the map until 1) it is explicitly removed from the array; or 2)
the array is freed.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200930224927.1936644-2-songliubraving@fb.com
2020-09-30 23:18:12 -07:00
..
preload
bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach
2020-09-29 13:09:23 -07:00
arraymap.c
bpf: Introduce BPF_F_PRESERVE_ELEMS for perf event array
2020-09-30 23:18:12 -07:00
bpf_inode_storage.c
bpf: Allow specifying a BTF ID per argument in function protos
2020-09-21 15:00:40 -07:00
bpf_iter.c
bpf: Bump iter seq size to support BTF representation of large data structures
2020-09-28 18:26:58 -07:00
bpf_local_storage.c
bpf: Use hlist_add_head_rcu when linking to local_storage
2020-09-19 01:12:35 +02:00
bpf_lru_list.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
bpf_lru_list.h
bpf: Fix a typo "inacitve" -> "inactive"
2020-04-06 21:54:10 +02:00
bpf_lsm.c
bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
2020-09-25 13:58:01 -07:00
bpf_struct_ops_types.h
bpf: tcp: Support tcp_congestion_ops in bpf
2020-01-09 08:46:18 -08:00
bpf_struct_ops.c
bpf: Move btf_resolve_size into __btf_resolve_size
2020-08-25 15:37:41 -07:00
btf.c
bpf: Fix context type resolving for extension programs
2020-09-29 13:09:24 -07:00
cgroup.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
core.c
bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach
2020-09-29 13:09:23 -07:00
cpumap.c
bpf, cpumap: Remove rcpu pointer from cpu_map_build_skb signature
2020-09-28 23:30:42 +02:00
devmap.c
bpf: {cpu,dev}map: Change various functions return type from int to void
2020-09-01 15:45:58 +02:00
disasm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295
2019-06-05 17:36:38 +02:00
disasm.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295
2019-06-05 17:36:38 +02:00
dispatcher.c
bpf: Remove bpf_image tree
2020-03-13 12:49:52 -07:00
hashtab.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-09-22 16:45:34 -07:00
helpers.c
bpf: Add bpf_snprintf_btf helper
2020-09-28 18:26:58 -07:00
inode.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-09-22 16:45:34 -07:00
local_storage.c
bpf/local_storage: Fix build without CONFIG_CGROUP
2020-07-25 20:16:36 -07:00
lpm_trie.c
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
Makefile
bpf: Implement bpf_local_storage for inodes
2020-08-25 15:00:04 -07:00
map_in_map.c
bpf: Relax max_entries check for most of the inner map types
2020-08-28 15:41:30 +02:00
map_in_map.h
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
map_iter.c
bpf: Implement link_query callbacks in map element iterators
2020-08-21 14:01:39 -07:00
net_namespace.c
bpf: Add support for forced LINK_DETACH command
2020-08-01 20:38:28 -07:00
offload.c
bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill
2020-02-17 16:53:49 +01:00
percpu_freelist.c
bpf: Dont iterate over possible CPUs with interrupts disabled
2020-02-24 16:18:20 -08:00
percpu_freelist.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
prog_iter.c
bpf: Refactor bpf_iter_reg to have separate seq_info member
2020-07-25 20:16:32 -07:00
queue_stack_maps.c
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
reuseport_array.c
bpf, net: Rework cookie generator as per-cpu one
2020-09-30 11:50:35 -07:00
ringbuf.c
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
stackmap.c
bpf: Allow specifying a BTF ID per argument in function protos
2020-09-21 15:00:40 -07:00
syscall.c
bpf: Support attaching freplace programs to multiple attach points
2020-09-29 13:09:24 -07:00
sysfs_btf.c
bpf: Support llvm-objcopy for vmlinux BTF
2020-03-19 12:32:38 +01:00
task_iter.c
bpf: Avoid iterating duplicated files for task_file iterator
2020-09-02 16:40:33 +02:00
tnum.c
bpf: Verifier, do explicit ALU32 bounds tracking
2020-03-30 14:59:53 -07:00
trampoline.c
bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach
2020-09-29 13:09:23 -07:00
verifier.c
bpf: Support attaching freplace programs to multiple attach points
2020-09-29 13:09:24 -07:00