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perf augmented_syscalls: Filter on a hard coded pid

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Just to show where we'll hook pid based filters, and what we use to
obtain the current pid, using a BPF getpid() equivalent.

Now we need to remove that hardcoded PID with a BPF hash map, so that we
start by filtering 'perf trace's own PID, implement the --filter-pid
functionality, etc.

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-oshrcgcekiyhd0whwisxfvtv@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 15:23:40 -03:00
parent 1475d35c4a
commit 55f127b431
1 changed files with 5 additions and 1 deletions
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6
tools/perf/examples/bpf/augmented_raw_syscalls.c
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@ -15,6 +15,7 @@
*/ */
#include <stdio.h> #include <stdio.h>
#include <unistd.h>
#include <linux/socket.h> #include <linux/socket.h>
/* bpf-output associated map */ /* bpf-output associated map */
@ -56,6 +57,9 @@ int sys_enter(struct syscall_enter_args *args)
unsigned int len = sizeof(augmented_args); unsigned int len = sizeof(augmented_args);
const void *filename_arg = NULL; const void *filename_arg = NULL;
if (getpid() == 2971)
return 0;
probe_read(&augmented_args.args, sizeof(augmented_args.args), args); probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
/* /*
* Yonghong and Edward Cree sayz: * Yonghong and Edward Cree sayz:
@ -125,7 +129,7 @@ int sys_enter(struct syscall_enter_args *args)
SEC("raw_syscalls:sys_exit") SEC("raw_syscalls:sys_exit")
int sys_exit(struct syscall_exit_args *args) int sys_exit(struct syscall_exit_args *args)
{ {
return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ return getpid() != 2971;
} }
license(GPL); license(GPL);