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=-3.8 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 EA5CCC433E0 for ; Sun, 19 Jul 2020 08:05:41 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9A64B207DF for ; Sun, 19 Jul 2020 08:05:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PzVllOw4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A64B207DF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1jx4Jo-0007p6-CR; Sun, 19 Jul 2020 04:05:08 -0400 Received: from mail-qv1-xf35.google.com ([2607:f8b0:4864:20::f35]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1jx4Jl-0007oy-Tf for Kernelnewbies@kernelnewbies.org; Sun, 19 Jul 2020 04:05:05 -0400 Received: by mail-qv1-xf35.google.com with SMTP id ed14so6103223qvb.2 for ; Sun, 19 Jul 2020 01:05:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=L3lOucS1XI9iLhdihG66TNtxR4g1aIGgscDcikS3X3U=; b=PzVllOw4QIXxqazM5s8KZ861m95Zr+oMrOR6sw4Nl1IiLVvK//5NCShdB22hwieCT4 7XtDAjQvQgCZsM9M31Uh3v2jtifySM85aaocEgOfes3tQCiiaJit8nuUNeTXMdBNgzHK hIAykwi7SViVkYDM9uQ9WclNAF844OpupriWZc9icv/zwa8zPUG2s54f+7pNYAfTUlel WDqfpaNRwxNJ6yLLSGXl8HsqtohVMPUuPfdqa3KY/6EoncdIwvpY7J+WKsPKI9DYrRXo HWcrnDVCnPpAjiy2NGaSO9pJC+H2JoUqTsdfsi389hb2d6l4gE6/x57iMzz4L8EWwXjd tN7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=L3lOucS1XI9iLhdihG66TNtxR4g1aIGgscDcikS3X3U=; b=AY3XUqAc+g4Z0P3ih3YlvO4GFKGOOdi8I2+YloO03s2aQ0YWHFn7vCtNCaM5Yp37p0 IDVLzzsJLDj6hGzc/cg4Mtr2uUKeqp84GmKpqeenFNMxjfr1GaZeucUyi/6L7L6vpm66 4Tsr1gOo7KOWlaukw2ohhleHMp+OxMbXN8HliFiEsmloWq9XAToX1CPJDRAGHw8mmL3b BlNTfngB9sVyZr0xCOJa9FBUXkcYWdabWV/LtWB4AoNbVlq6toi3kFesfL1MhQtN9Hsc YShZV6nSkWESe0s4RdYRDS2S0JLVQU92mYuGZcDmwPrnX8ja5cOvSYsbQgGj3Qs4H05L H+jA== X-Gm-Message-State: AOAM531hJDL4jP2edoSLyiG8vTN0VRN313Wa60wntT8yjDhFP0I4c7aY a5DJKB7FgR4AvPXSKpqbRyFhdYaxTF+KL8joL4gC06+pLrK1Vw== X-Google-Smtp-Source: ABdhPJwwE7hOvwI5dSWQ80e8gupEoMApuPs/YdwWUeagEnvq5bcaUMZxohg5zHeQ+eBsCB6tXVtMO5u4dMqw3Q08+QQ= X-Received: by 2002:a0c:8b4a:: with SMTP id d10mr16412212qvc.31.1595145902967; Sun, 19 Jul 2020 01:05:02 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?B?5a2Z5LiW6b6ZIHN1bnNoaWxvbmc=?= Date: Sun, 19 Jul 2020 16:04:51 +0800 Message-ID: Subject: How to comfirm whether __GI___clock_gettime() implemented as fast system call or not on x86_64 platform with Linux 4.19.84? To: kernelnewbies X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kernelnewbies-bounces@kernelnewbies.org Hi, list How to comfirm whether __GI___clock_gettime() implemented as fast system call or not on x86_64 platform with Linux 4.19.84? Here is some related backtrace log(hope there is some hint on this question): (gdb) bt #0 0x00007ffc41da89fa in ?? () #1 0x00007fa90785aaf0 in ?? () #2 0x00007fa905a16876 in __GI___clock_gettime (clock_id=0, tp=0x7fa90785aac0) at ../sysdeps/unix/clock_gettime.c:115 Thank you for your attention to this matter. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies