[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Request for help: passing network statistics from netback driver to Xen scheduler.
Hi everyone! This my first time on this mailing list. Iâm working with Xen for my master thesis, and Iâd like to ask you for an advice. I donât have any previous experience with Xen or Linux development, so please bear with my if Iâm doing something silly! What Iâm trying to accomplish is to build a Xen scheduler, which is scheduling domains based on their network intensity (Iâm trying to implement one of the co-scheduling algorithms). So far, Iâve implemented simple round-robin scheduler which seems to work. Now I want to extend it to take into account the network traffic of each domain (higher the traffic, higher the priority). Iâve found a patch for older version of Xen[1], which implemented something similar. Author of this patch added some statistics to share_info structure, and updated them in the netback driver. Iâd like to do something similar. Iâve modified the ubunutâs kernel code to add some statistics to shared_info: -Iâve modified the shared_info structure in include/xen/interface/xen.h and added an array for storing statistics (up to 10 domains): unsigned long network_intensity[10] -Iâve used the EXPORT_SYMBOL macro to make the HYPERVISOR_shared_info available in netback driver - in the driver/net/xen-netback/netback.c file, Iâve modified function xenvif_rx_action, so that itâd increment the network intensity counter. Iâve also added a printk statement to verify if my code is working - Iâve updated the shared_info structure in xen source code as well. After compiling the kernel and booting it, Iâve verified that output from my printk statements was visible in the output from dmesg. However, when I try to access statistics from shared_info in Xen scheduler, theyâre always 0. Could you please tell me what am I doing wrong? Do I have to somehow request synchronisation of the shared_info between kernel and Xen? Or maybe is there some better way to get data on network intensity without modifying the kernel? Thank you in advance for you help. Kind regards, Marcin DÅugajczyk [1]: http://csl.cse.psu.edu/?q=node/54 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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