From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.web.de (mout.web.de [212.227.17.12]) by sourceware.org (Postfix) with ESMTPS id BF4333858415 for ; Sun, 19 Sep 2021 14:04:17 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org BF4333858415 X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([2.244.80.218]) by smtp.web.de (mrweb105 [213.165.67.124]) with ESMTPSA (Nemesis) id 1MRW6Z-1mDKoa0ndV-00NFXv; Sun, 19 Sep 2021 16:04:13 +0200 Message-ID: Date: Sun, 19 Sep 2021 16:04:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: Checking special execution durations for the determination of mountable file systems Content-Language: en-GB To: Adhemerval Zanella Cc: libc-help@sourceware.org References: <2b184d53-9044-0e6c-b4db-b87606478026@web.de> From: Markus Elfring In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:pQjI4ZSiwQiWcMRGFt/bwPx0YmCBACypucTgqmNx0SQ9MxqKZMJ KskSWYZBcg1YvtY2EsIFKk6rY1LqDCn5F9xWy88X4Zcg2etdzSlImmqCIgfNjOPmAOXPkBv an+PEb7+XJCn/YQM8gVX7d+zYBdIOqicbImpfKOes0sr8m3ExgQOupBpBIMzdk3x960aOHf w5skhhxiwxamXmBBKOXHA== X-UI-Out-Filterresults: notjunk:1;V03:K0:4d4G2yfM7u0=:nn3p8S7SliPdN4KwOEWgFE ORMCOyTIKWGnCFxAq2t+/B1TYSb+Kowsh2356YIVTge5e78kq7HgvHQ0ulAehZQm3HcWqcber 5fsHoJgniQGj0W6yx8VzLVrq3P+YsPYBMSoXxAyBV43BM29JWpe+gm/5mgVOvDrpD1xVg+kmi MFdk7K3ROMfKJbXIViHBMpkhsgWDkZbFxOV7wzKuVyayoHdVPQyEaOcCI52tx+wFYgQ+HCcov XmU00EFJnOSmvW0C7zHsQuJAqX7OnBudshTCMuLKayuq4ahhdnAU/ziGvVE3CahdDSKxGZTH7 qoRP/m6JZJntdqXVCcrG6razP/XuuXFMwIT5nKf1nCA6y6xREVg+qwRZ17ksXpXahKqXK66nb h/lclE8m4kXrHkgVR4L0sfLqN7UxrhW4NxuN5NKoUI/oBcQ/khQwDui3XywuwkPfdsX2o2ZvF 4JhuTcYr1QYznOzRVGQkJAAl1WpP8sVj1bdhEM2wefGwP3gQo92A+qRuRL6+0l+5gNSUTS3wb oM/h4BwLTaNBNCv97VNUflulMv440gVBrhKMDqtYvUFMIJg57yPhCx2/GU8E3GR/nYYOs0+mp 89yr/Xc6mYUynLfP3stIvhq1jESH9x+qL7GzuS8+i/+GGbY/dQP61yn55Y/b1yV1DojJlWqFp DT/cjWiz9PQDNF1UI0jPFT/nNg5R4qOws1vUjfvVZFk4Ugla7KMFFhwzP5/5kSKZtnK6j62+R S1ECm1Y0yan8TUQYaVz+pTr5it4ZolpE0Yn2xqd0Zx0Lk/FTkv0+UIt7NMI5dW4lSuUK1c3dz UAgcHeK2ORITsJIg8g6Ow0keX+PX6MDa7MBG4ybvMiirMwN98PXgKvhFDDrSgyoG+IkqMzxom vXtKeFQKwIKCp8vBJwAsnM0wP9k+z2pNsEhAbOjvmyIwHY8WcOS8aWtxgvc/WNPxU0SqzP4IF ZZevMiQBI4hzZqA1hSl1WfQpfDnMTA9JbvoTRiyj8aP77wASGe/Gkf2ZnDsI7xLMj0Xg/CPar uLyoPMoW81ZXhsgDi/tshuKXfVO54aAfn+zHiz+rfeN7oLlUDeiCg43krFO9nOe2wRt0pE/bx rYmQrC2DCG0+XA= X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, NICE_REPLY_A, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-help@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-help mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Sep 2021 14:04:19 -0000 > The statvfs() calls statfs() which in turn is a syscall. There is some > memory copy involved on __internal_statvfs64(), > but it's runtime should be negligible. Are any test cases available for these functions? Which impression did you get from the displayed execution durations? > I would check with Linux perf with kernel probing enabled to see exactly > what is happening. I can eventually increase the tracing depth for the analysis tool =E2=80= =9Cuftrace=E2=80=9D (if further details from Linux function calls would be really helpful for such a clarification approach). Regards, Markus