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| author | Alexei Starovoitov <ast@fb.com> | 2016-02-18 04:58:58 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-20 06:21:44 +0100 |
| commit | d5a3b1f691865be576c2bffa708549b8cdccda19 (patch) | |
| tree | 12f6009f168baee6889a0fde07d60ac3f5c12aac /kernel/bpf/Makefile | |
| parent | perf: generalize perf_callchain (diff) | |
| download | linux-d5a3b1f691865be576c2bffa708549b8cdccda19.tar.xz linux-d5a3b1f691865be576c2bffa708549b8cdccda19.zip | |
bpf: introduce BPF_MAP_TYPE_STACK_TRACE
add new map type to store stack traces and corresponding helper
bpf_get_stackid(ctx, map, flags) - walk user or kernel stack and return id
@ctx: struct pt_regs*
@map: pointer to stack_trace map
@flags: bits 0-7 - numer of stack frames to skip
bit 8 - collect user stack instead of kernel
bit 9 - compare stacks by hash only
bit 10 - if two different stacks hash into the same stackid
discard old
other bits - reserved
Return: >= 0 stackid on success or negative error
stackid is a 32-bit integer handle that can be further combined with
other data (including other stackid) and used as a key into maps.
Userspace will access stackmap using standard lookup/delete syscall commands to
retrieve full stack trace for given stackid.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/Makefile')
| -rw-r--r-- | kernel/bpf/Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile index 13272582eee0..8a932d079c24 100644 --- a/kernel/bpf/Makefile +++ b/kernel/bpf/Makefile @@ -2,3 +2,6 @@ obj-y := core.o obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o +ifeq ($(CONFIG_PERF_EVENTS),y) +obj-$(CONFIG_BPF_SYSCALL) += stackmap.o +endif |