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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E95FC433EF for ; Tue, 28 Sep 2021 00:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DDA0611EF for ; Tue, 28 Sep 2021 00:11:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238298AbhI1AMs (ORCPT ); Mon, 27 Sep 2021 20:12:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:42192 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238253AbhI1AMr (ORCPT ); Mon, 27 Sep 2021 20:12:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 34621611CE; Tue, 28 Sep 2021 00:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632787869; bh=e0biuuUrxQBT6LwpPLtkePfaM2PRMIsMY1zCFndAnbo=; h=From:To:Cc:Subject:Date:From; b=RJaEqtQXdLxj6Bv/EYcrKJ4xld+xTLIqUyaaZth7z7NGNxViLNOX/7hH+DXJ2Pss3 erVJhPu5aeU7raUaGQbGnCQ8Z7FA0dmOJIeYDfWl6vDDa9XLEffU/34wMdKLx6oimn X28SO9GMjmBaM/bdoywAoFvNvrW3kAejHn+w4yOCEnZKXqEaUUI5ClQ/tSopmoQofb jtjs5Ne2ZikLopaJnt3gifHQ0l593ylx/iXuQTzkyGatobUpOIGvbPxvHQbCp0WuSk Hkb67Hb+QpO4nnPwkgw1xQBpkjtV5Ndkeikk19PhMpRt1rP041FwuJD41MV+cPFy4G wdgCd6DclL/7w== From: Masami Hiramatsu To: Steven Rostedt , Shuah Khan , Shuah Khan Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Masami Hiramatsu Subject: [PATCH] selftests/ftrace: Stop tracing before searching non-exist event entry Date: Tue, 28 Sep 2021 09:11:06 +0900 Message-Id: <163278786632.187921.7275187717663096458.stgit@devnote2> X-Mailer: git-send-email 2.25.1 User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Stop tracing before searching the pattern which is expected to not exist on the trace buffer. In some case, it will take too long and may not come back eternally because while searching the tracing data will be increased by the searching activity. I found this with enabling kernel debug options, like kmemleak, lockdep etc. and run it on qemu with 2 CPUs. It did not come back in 20 minutes and finally I need to interrupt it to stop. Signed-off-by: Masami Hiramatsu --- .../ftrace/test.d/ftrace/func_profiler.tc | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc index 1dbd766c0cd2..440f4d87aa4b 100644 --- a/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_profiler.tc @@ -56,6 +56,9 @@ clear_trace sleep 1 echo "make sure something other than scheduler is being traced" + +echo 0 > tracing_on + if ! grep -v -e '^#' -e 'schedule' trace > /dev/null; then cat trace fail "no other functions besides schedule was found"