From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88D04C31E5B for ; Wed, 19 Jun 2019 15:08:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 566F421897 for ; Wed, 19 Jun 2019 15:08:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560956895; bh=71TJ/i+a+ltiiVmXz7FgsEoC2HngwssIwub8kPjFd4s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LOGZ8mZb2hM5SjEpnMI+k5rFkTWataHmzwg0Ff9KmksGRHW+Qdg3Kipgcy5U5wpFC NBm9R7xlNWLeqq6NxG+/1BfuqzI0pqBKBUiFtc0771hT1yeNijvV4Wt+P5jzVOwx+Z pcFn02O+lZ6OLxNg6GSJVk4fntG3z0U1cgpX9iqo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730404AbfFSPIO (ORCPT ); Wed, 19 Jun 2019 11:08:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:36550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727002AbfFSPIN (ORCPT ); Wed, 19 Jun 2019 11:08:13 -0400 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B92C821883; Wed, 19 Jun 2019 15:08:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560956892; bh=71TJ/i+a+ltiiVmXz7FgsEoC2HngwssIwub8kPjFd4s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gYpqSZPnofQ+wk6OFl9BgJ3ftkFB9SG4GJvRGQp/IdjQxF/2g1bD3TaA7J3c8XbOo YYroZO6Xw7q/OhUgqLGfdgECtuWwGlFcLnk32tjg6rmR7r9NGBcYKaDPZwIEUpXeHY ZkCuuN/Fh3MfCQhN0xpwUmZo7j7SW35VPxsSsZPA= From: Masami Hiramatsu To: Steven Rostedt Cc: Masami Hiramatsu , Ingo Molnar , linux-kernel@vger.kernel.org, Tom Zanussi , Ravi Bangoria , Namhyung Kim , Arnaldo Carvalho de Melo Subject: [PATCH v2 06/12] tracing/kprobe: Add per-probe delete from event Date: Thu, 20 Jun 2019 00:08:08 +0900 Message-Id: <156095688848.28024.15798690082378432435.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <156095682948.28024.14190188071338900568.stgit@devnote2> References: <156095682948.28024.14190188071338900568.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow user to delete a probe from event. This is done by head match. For example, if we have 2 probes on an event $ cat kprobe_events p:kprobes/testprobe _do_fork r1=%ax r2=%dx p:kprobes/testprobe idle_fork r1=%ax r2=%cx Then you can remove one of them by passing the head of definition which identify the probe. $ echo "-:kprobes/testprobe idle_fork" >> kprobe_events Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_kprobe.c | 25 ++++++++++++++++++++++++- kernel/trace/trace_probe.c | 18 ++++++++++++++++++ kernel/trace/trace_probe.h | 2 ++ 3 files changed, 44 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index f43098bf62dd..18c4175b6585 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -137,13 +137,36 @@ static bool trace_kprobe_is_busy(struct dyn_event *ev) return trace_probe_is_enabled(&tk->tp); } +static bool trace_kprobe_match_command_head(struct trace_kprobe *tk, + int argc, const char **argv) +{ + char buf[MAX_ARGSTR_LEN + 1]; + + if (!argc) + return true; + + if (!tk->symbol) + snprintf(buf, sizeof(buf), "0x%p", tk->rp.kp.addr); + else if (tk->rp.kp.offset) + snprintf(buf, sizeof(buf), "%s+%u", + trace_kprobe_symbol(tk), tk->rp.kp.offset); + else + snprintf(buf, sizeof(buf), "%s", trace_kprobe_symbol(tk)); + if (strcmp(buf, argv[0])) + return false; + argc--; argv++; + + return trace_probe_match_command_args(&tk->tp, argc, argv); +} + static bool trace_kprobe_match(const char *system, const char *event, int argc, const char **argv, struct dyn_event *ev) { struct trace_kprobe *tk = to_trace_kprobe(ev); return strcmp(trace_probe_name(&tk->tp), event) == 0 && - (!system || strcmp(trace_probe_group_name(&tk->tp), system) == 0); + (!system || strcmp(trace_probe_group_name(&tk->tp), system) == 0) && + trace_kprobe_match_command_head(tk, argc, argv); } static nokprobe_inline unsigned long trace_kprobe_nhit(struct trace_kprobe *tk) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 651a1449acde..f8c3c65c035d 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1047,3 +1047,21 @@ int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b) return 0; } + +bool trace_probe_match_command_args(struct trace_probe *tp, + int argc, const char **argv) +{ + char buf[MAX_ARGSTR_LEN + 1]; + int i; + + if (tp->nr_args < argc) + return false; + + for (i = 0; i < argc; i++) { + snprintf(buf, sizeof(buf), "%s=%s", + tp->args[i].name, tp->args[i].comm); + if (strcmp(buf, argv[i])) + return false; + } + return true; +} diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 39926e8a344b..2dcc4e317787 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -332,6 +332,8 @@ int trace_probe_remove_file(struct trace_probe *tp, struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, struct trace_event_file *file); int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b); +bool trace_probe_match_command_args(struct trace_probe *tp, + int argc, const char **argv); #define trace_probe_for_each_link(pos, tp) \ list_for_each_entry(pos, &(tp)->event->files, list)