I would use git blame to find out the reason. Barry > On 9 Dec 2019, at 13:18, Martha Simons <marthasimons9999@xxxxxxxxx> wrote: > > (I know that this question might be more reasonable on a kernel list, > but a while back I posted the question twice and got no answers.) > > The acct struct is defined in /usr/include/sys/acct.h includes both > ac_io and ac_rw for bytes transferred and blocks read or written, > respectively. > > Fair and good - works (on paper) similarly to unix, > solaris, hp-ux, etc. > > However, in the kernel code [kernel/acct.c], ac_io (char) and ac_rw > (blocks) are always set to 0 by these two lines: > > ac.ac_io = encode_comp_t(0 /* current->io_usage */); > ac.ac_rw = encode_comp_t(ac.ac_io / 1024); > > For most purposes, this probably wouldn't be an issue, but I also do > extensive performance analysis on several platforms and have written a > fairly compresive accounting package (as a wraparound for psacct or as > a standalone) including both an improved acctcom and a built-in > reporter for it. > > Does anyone know wby the kernel zero's out the bytes transferred data? > (Overhead comes to mind.) Not that it makes a huge differnce for my > purposes (I had to write some wraparound code to make a > "best-guestimate" about the data I'm missing), but curiosity is bugging > me now. When I compile my program on other OS's I get useful data for > char and block i/o and I'd like to find out whether there is something > obvious that I'm just totally missing here https://tinyurl.com/rljj8ae ..). > > Thanks > > -- > william w. austin waustin(a)speakeasy.net > "life is just another phase i'm going through. this time, anyway ..." > _______________________________________________ > devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
