perf ftrace: Append an EOL when write tracing files
Before this change, the '--graph-funcs', '--nograph-funcs' and '--trace-funcs' options didn't work as expected when the <func> doesn't exist. Because the kernel side hid possible errors. $ sudo ./perf ftrace -a --graph-depth 1 --graph-funcs abcdefg 0) 0.140 us | rcu_all_qs(); 3) 0.304 us | mutex_unlock(); 0) 0.153 us | find_vma(); 3) 0.088 us | __fsnotify_parent(); 0) 6.145 us | handle_mm_fault(); 3) 0.089 us | fsnotify(); 3) 0.161 us | __sb_end_write(); 3) 0.710 us | SyS_close(); 3) 7.848 us | exit_to_usermode_loop(); On the example above, I specified the function filter 'abcdefg' but all functions are enabled. The expected result is for all functions to be filtered, since there is no such function ('abcdefg') The original fix is to make the kernel support '\0' as end of string: https://lkml.org/lkml/2018/1/16/116 But above fix cannot be compatible with old kernels. Then Namhyung Kim suggest adding a space after function name. This patch will append an '\n' when write tracing file. After this fix, the perf will report correct error state. Also let it print an error if reset_tracing_files() fails. Committer testing: Now it prints: # perf ftrace -a --graph-depth 1 --graph-funcs abcdefg failed to set tracing filters # And for an existing function: # perf ftrace -a --graph-depth 1 --graph-funcs SyS_open 3) | SyS_open() { 3) ! 494.899 us | } 0) + 23.910 us | SyS_open(); 1) + 17.115 us | SyS_open(); 1) + 13.900 us | SyS_open(); ------------------------------------------ 3) qemu-sy-2817 => pickup-1290 ------------------------------------------ 3) + 20.021 us | SyS_open(); # Signed-off-by: Changbin Du <changbin.du@intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1519007609-14551-1-git-send-email-changbin.du@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -72,6 +72,7 @@ static int __write_tracing_file(const char *name, const char *val, bool append)
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ssize_t size = strlen(val);
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int flags = O_WRONLY;
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char errbuf[512];
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char *val_copy;
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file = get_tracing_file(name);
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if (!file) {
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@ -91,12 +92,23 @@ static int __write_tracing_file(const char *name, const char *val, bool append)
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goto out;
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}
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if (write(fd, val, size) == size)
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/*
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* Copy the original value and append a '\n'. Without this,
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* the kernel can hide possible errors.
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*/
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val_copy = strdup(val);
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if (!val_copy)
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goto out_close;
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val_copy[size] = '\n';
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if (write(fd, val_copy, size + 1) == size + 1)
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ret = 0;
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else
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pr_debug("write '%s' to tracing/%s failed: %s\n",
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val, name, str_error_r(errno, errbuf, sizeof(errbuf)));
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free(val_copy);
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out_close:
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close(fd);
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out:
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put_tracing_file(file);
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@ -280,8 +292,10 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
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signal(SIGCHLD, sig_handler);
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signal(SIGPIPE, sig_handler);
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if (reset_tracing_files(ftrace) < 0)
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if (reset_tracing_files(ftrace) < 0) {
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pr_err("failed to reset ftrace\n");
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goto out;
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}
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/* reset ftrace buffer */
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if (write_tracing_file("trace", "0") < 0)
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