SyscallVerbose only works in SE mode unless I'm thuroughly confused about something. It would be really cool and useful to make it work in FS mode, but then you'd have to figure out when a syscall was happening and scrape out the right arguments using the right translations (which may or may not be in the TLB), figure out what process you're dealing with, etc. I assume you're using FS because you say you're spending 50% of your time in the kernel.
There are less ambitious ways to get at some of that information. You might want to look at the tracer classes like ExecTracer in exetrace.hh and exetrace.hh. You could also put a DPRINTF into the execute function of the call_pal instruction (line 852+ in arch/alpha/isa/decoder.isa). Gabe Quoting ef <[email protected]>: > I tried that previously, Maybe I didnt run things long enough but it never > displayed anything. Might be an error on my part > > On Tue, Feb 23, 2010 at 8:03 PM, Steve Reinhardt <[email protected]> wrote: > >> You can also try enabling the SyscallVerbose trace flag... that may or >> may not be more convenient depending on what you're doing. >> >> Steve >> >> On Tue, Feb 23, 2010 at 5:08 PM, ef <[email protected]> wrote: >> > systems call can be tracked using the stat.txt output >> > search for things such as: >> > system.cpu0.kern.syscall::73 1 0.00% >> 0.01% >> > # number of syscalls executed >> > >> > these numbers can be traced searching from system call tables. using an >> > alpha cross compiler or the linux kernel source code (or google you can >> > trace these calls.) >> > system call macros usually have the prefix "__NR_" >> > >> > >> > On Wed, Feb 10, 2010 at 6:07 PM, ef <[email protected]> wrote: >> >> >> >> Hello, >> >> I am running a program where I noticed that 50% of M5 execution time is >> >> spent in the kernel. Looking at the program, I cannot find reasons why >> this >> >> would be the case (4 threads, where there is very little communcation >> >> between threads). Anyone have any idea on how to trace the instruction >> >> callsys,and see what system calls are made? >> >> >> >> I see a huge amount of callsys, swpipl, rti instructions being executed! >> >> >> >> >> >> Thanks, >> >> EF >> > >> > _______________________________________________ >> > m5-users mailing list >> > [email protected] >> > http://m5sim.org/cgi-bin/mailman/listinfo/m5-users >> > >> _______________________________________________ >> m5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/m5-users >> > _______________________________________________ m5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/m5-users
