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authorArnaldo Carvalho de Melo <acme@redhat.com>2018-11-06 21:50:36 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-11-21 18:00:31 +0300
commit8008aab0962ea68cc00d15e8d7b0637b48837a40 (patch)
treed48b4793cf351867fbf1a21a2ef397af9039c4b7
parent382b55dbef6b68e3fef2fd8a438fbaff57695308 (diff)
downloadlinux-8008aab0962ea68cc00d15e8d7b0637b48837a40.tar.xz
perf bpf: Add simple pid_filter class accessible to BPF proggies
Will be used in the augmented_raw_syscalls.c to implement 'perf trace --filter-pids'. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-9sybmz4vchlbpqwx2am13h9e@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/include/bpf/pid_filter.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/include/bpf/pid_filter.h b/tools/perf/include/bpf/pid_filter.h
new file mode 100644
index 000000000000..6e61c4bdf548
--- /dev/null
+++ b/tools/perf/include/bpf/pid_filter.h
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: LGPL-2.1
+
+#ifndef _PERF_BPF_PID_FILTER_
+#define _PERF_BPF_PID_FILTER_
+
+#include <bpf.h>
+
+#define pid_filter(name) pid_map(name, bool)
+
+static int pid_filter__add(struct bpf_map *pids, pid_t pid)
+{
+ bool value = true;
+ return bpf_map_update_elem(pids, &pid, &value, BPF_NOEXIST);
+}
+
+static bool pid_filter__has(struct bpf_map *pids, pid_t pid)
+{
+ return bpf_map_lookup_elem(pids, &pid) != NULL;
+}
+
+#endif // _PERF_BPF_PID_FILTER_