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perf bpf: Add simple pid_filter class accessible to BPF proggies

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-11-06 15:50:36 -03:00
parent 382b55dbef
commit 8008aab096
1 changed files with 21 additions and 0 deletions
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21
tools/perf/include/bpf/pid_filter.h Normal file
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// 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_