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| author | Jiong Wang <jiong.wang@netronome.com> | 2019-02-11 12:01:20 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-02-11 20:31:38 -0800 |
| commit | bd4aed0ee73ca873bef3cb3ec746dd796f03df28 (patch) | |
| tree | 1dcd4de735f8ca3dbf672dc5d48d064ea1dea5dc /tools/testing/selftests/bpf/progs/test_stacktrace_map.c | |
| parent | 4836b4637ef080c2764c44ee40ed354cdb991d79 (diff) | |
| download | linux-bd4aed0ee73ca873bef3cb3ec746dd796f03df28.tar.gz linux-bd4aed0ee73ca873bef3cb3ec746dd796f03df28.tar.bz2 linux-bd4aed0ee73ca873bef3cb3ec746dd796f03df28.zip | |
selftests: bpf: centre kernel bpf objects under new subdir "progs"
At the moment, all kernel bpf objects are listed under BPF_OBJ_FILES.
Listing them manually sometimes causing patch conflict when people are
adding new testcases simultaneously.
It is better to centre all the related source files under a subdir
"progs", then auto-generate the object file list.
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_stacktrace_map.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_stacktrace_map.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c new file mode 100644 index 000000000000..af111af7ca1a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2018 Facebook + +#include <linux/bpf.h> +#include "bpf_helpers.h" + +#ifndef PERF_MAX_STACK_DEPTH +#define PERF_MAX_STACK_DEPTH 127 +#endif + +struct bpf_map_def SEC("maps") control_map = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(__u32), + .max_entries = 1, +}; + +struct bpf_map_def SEC("maps") stackid_hmap = { + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(__u32), + .value_size = sizeof(__u32), + .max_entries = 16384, +}; + +struct bpf_map_def SEC("maps") stackmap = { + .type = BPF_MAP_TYPE_STACK_TRACE, + .key_size = sizeof(__u32), + .value_size = sizeof(__u64) * PERF_MAX_STACK_DEPTH, + .max_entries = 16384, +}; + +struct bpf_map_def SEC("maps") stack_amap = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(__u64) * PERF_MAX_STACK_DEPTH, + .max_entries = 16384, +}; + +/* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */ +struct sched_switch_args { + unsigned long long pad; + char prev_comm[16]; + int prev_pid; + int prev_prio; + long long prev_state; + char next_comm[16]; + int next_pid; + int next_prio; +}; + +SEC("tracepoint/sched/sched_switch") +int oncpu(struct sched_switch_args *ctx) +{ + __u32 max_len = PERF_MAX_STACK_DEPTH * sizeof(__u64); + __u32 key = 0, val = 0, *value_p; + void *stack_p; + + value_p = bpf_map_lookup_elem(&control_map, &key); + if (value_p && *value_p) + return 0; /* skip if non-zero *value_p */ + + /* The size of stackmap and stackid_hmap should be the same */ + key = bpf_get_stackid(ctx, &stackmap, 0); + if ((int)key >= 0) { + bpf_map_update_elem(&stackid_hmap, &key, &val, 0); + stack_p = bpf_map_lookup_elem(&stack_amap, &key); + if (stack_p) + bpf_get_stack(ctx, stack_p, max_len, 0); + } + + return 0; +} + +char _license[] SEC("license") = "GPL"; +__u32 _version SEC("version") = 1; /* ignored by tracepoints, required by libbpf.a */ |