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perf bpf: Convert legacy map definition to BTF-defined

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The libbpf is switching off support for legacy map definitions [1],
which will break the perf llvm tests.

Moving the base source map definition to BTF-defined, so we need
to use -g compile option for to add debug/BTF info.

[1] https://lore.kernel.org/bpf/20220627211527.2245459-1-andrii@kernel.org/

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20220704152721.352046-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2022-07-04 17:27:21 +02:00 committed by Arnaldo Carvalho de Melo
parent 6d518ac7be
commit 8b1e1a0347
2 changed files with 24 additions and 13 deletions
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35
tools/perf/tests/bpf-script-example.c
View File

@ -17,20 +17,31 @@ static void *(*bpf_map_lookup_elem)(void *map, void *key) =
static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
(void *) BPF_FUNC_map_update_elem;
struct bpf_map_def {
unsigned int type;
unsigned int key_size;
unsigned int value_size;
unsigned int max_entries;
};
/*
* Following macros are taken from tools/lib/bpf/bpf_helpers.h,
* and are used to create BTF defined maps. It is easier to take
* 2 simple macros, than being able to include above header in
* runtime.
*
* __uint - defines integer attribute of BTF map definition,
* Such attributes are represented using a pointer to an array,
* in which dimensionality of array encodes specified integer
* value.
*
* __type - defines pointer variable with typeof(val) type for
* attributes like key or value, which will be defined by the
* size of the type.
*/
#define __uint(name, val) int (*name)[val]
#define __type(name, val) typeof(val) *name
#define SEC(NAME) __attribute__((section(NAME), used))
struct bpf_map_def SEC("maps") flip_table = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(int),
.max_entries = 1,
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, int);
} flip_table SEC(".maps");
SEC("func=do_epoll_wait")
int bpf_func__SyS_epoll_pwait(void *ctx)

2
tools/perf/util/llvm-utils.c
View File

@ -25,7 +25,7 @@
"$CLANG_OPTIONS $PERF_BPF_INC_OPTIONS $KERNEL_INC_OPTIONS " \
"-Wno-unused-value -Wno-pointer-sign " \
"-working-directory $WORKING_DIR " \
"-c \"$CLANG_SOURCE\" -target bpf $CLANG_EMIT_LLVM -O2 -o - $LLVM_OPTIONS_PIPE"
"-c \"$CLANG_SOURCE\" -target bpf $CLANG_EMIT_LLVM -g -O2 -o - $LLVM_OPTIONS_PIPE"
struct llvm_param llvm_param = {
.clang_path = "clang",