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perf bpf: Add simple pid_filter class accessible to BPF proggies

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message Nov 22, 2018 perf events

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Commit-ID:  8008aab0962ea68cc00d15e8d7b0637b48837a40
Gitweb:     https://git.kernel.org/tip/8008aab0962ea68cc00d15e8d7b0637b48837a40
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 6 Nov 2018 15:50:36 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 21 Nov 2018 12:00:31 -0300

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 <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Link https://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/include/bpf/pid_filter.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
tools/perf/include/bpf/pid_filter.h new file +21 -0
new file mode 100644
index 000000000000..6e61c4bdf548
@@ -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_