Messages in this thread | | | Date | Fri, 2 Dec 2016 12:20:29 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH v2] intelrdt: resctrl: recommend locking for resctrlfs |
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On Thu, 1 Dec 2016, Marcelo Tosatti wrote: > > There is a locking problem between different applications > reading/writing to resctrlfs directory at the same time (read the patch > below for details). > > Suggest a standard locking scheme for applications to use.
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> +To coordinate atomic operations on resctrl and avoid the problem > +above, the following locking procedure is recommended: > + > +A) open /var/lock/resctrl/fs.lock with O_CREAT|O_EXCL. > +B) if success, write pid of program accessing the directory > + structure to this file. > +C) read/write the directory structure. > +D) remove file.
What's wrong with using flock, which works from shell scripts as well?
Thanks,
tglx
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