From 77ecb64050ff580963cbb8b8f1b02db91dc9efaf Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 6 Nov 2018 16:01:26 -0300 Subject: [PATCH] perf augmented_syscalls: Drop 'write', 'poll' for testing without self pid filter When testing system wide tracing without filtering the syscalls called by 'perf trace' itself we get into a feedback loop, drop for now those two syscalls, that are the ones that 'perf trace' does in its loop for writing the syscalls it intercepts, to help with testing till we get that filtering in place. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-rkbu536af66dbsfx51sr8yof@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/examples/bpf/augmented_raw_syscalls.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index ec109c1..7d72931 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -43,7 +43,9 @@ struct augmented_filename { char value[256]; }; +#define SYS_WRITE 1 #define SYS_OPEN 2 +#define SYS_POLL 7 #define SYS_OPENAT 257 SEC("raw_syscalls:sys_enter") @@ -101,6 +103,8 @@ int sys_enter(struct syscall_enter_args *args) * after the ctx memory access to prevent their down stream merging. */ switch (augmented_args.args.syscall_nr) { + case SYS_WRITE: + case SYS_POLL: return 0; case SYS_OPEN: filename_arg = (const void *)args->args[0]; __asm__ __volatile__("": : :"memory"); break; -- 2.7.4