From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Stancek Date: Mon, 29 Aug 2016 09:34:54 -0400 (EDT) Subject: [LTP] [PATCH] lsmod01: parse a copy of /proc/modules In-Reply-To: <57C43307.8000709@oracle.com> References: <1472468916-13152-1-git-send-email-stanislav.kholmanskikh@oracle.com> <20160829125050.GD30021@rei.lan> <57C43307.8000709@oracle.com> Message-ID: <8140813.24444.1472477694219.JavaMail.zimbra@redhat.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it ----- Original Message ----- > From: "Stanislav Kholmanskikh" > To: "Cyril Hrubis" > Cc: "vasily isaenko" , ltp@lists.linux.it > Sent: Monday, 29 August, 2016 3:05:11 PM > Subject: Re: [LTP] [PATCH] lsmod01: parse a copy of /proc/modules > > > > On 08/29/2016 03:50 PM, Cyril Hrubis wrote: > > Hi! > >> In my environment, if TMPDIR is on NFSv4, this test case fails with: > >> > >> lsmod01 1 TFAIL : lsmod output different from /proc/modules. > >> 21c21 > >> < sunrpc 207591 28 > >> --- > >> > sunrpc 207591 29 > >> > >> To avoid such problems I separate the process of getting data from > >> /proc/modules and the process of parsing it in the pipe structure. > > > > So the sunrpc module gets its ref counter incremented from somewhere of > > the nfs kernel code once we open file on NFS? > > Looks so. I hava a share mounted from localhost: > > [root@skholman-m7 mnt]# mount|grep mnt > 127.0.0.1:/opt on /mnt type nfs > (rw,vers=4,addr=127.0.0.1,clientaddr=127.0.0.1) > [root@skholman-m7 mnt]# awk '{print $1, $2, $3}' /proc/modules|sort > > /tmp/not_nfs > [root@skholman-m7 mnt]# awk '{print $1, $2, $3}' /proc/modules|sort > nfs > [root@skholman-m7 mnt]# grep sunrpc nfs > sunrpc 207591 29 > [root@skholman-m7 mnt]# grep sunrpc /tmp/not_nfs > sunrpc 207591 28 > [root@skholman-m7 mnt]# And if you do that with just "cat /proc/modules", then there's no difference? Could it be that it's actually first write that takes extra ref? cat is reading in 65536 byte chunks for me, awk only 1024. Regards, Jan > > > > > > > But shouldn't the shell open the temp file the output is redirected to > > before it executes the command line anyway? > > > > -- > Mailing list info: https://lists.linux.it/listinfo/ltp >