Hello,
On Thu, Aug 21, 2008 at 4:40 AM, TakashiYamamoto <[EMAIL PROTECTED]> wrote: >> I've been trying to use perfmon2 on long-running programs on the Cell >> architecture (a Playstation3). >> >> The problem is that pfmon never returns counts higher than 2^32. On >> kernel 2.6.24 it seemed that the counters were just overflowing and the >> virtual 64-bit counter just not updated. I updated the kernel to 2.6.26 >> (which was a lot of pain, turns out there is something broken with USB on >> kernels more recent than 2.6.24) and the problem is changed a bit but >> still there. Now the counts seem to max out at 4294967295 >> >> For example, I get results like this: >> >> > taskset 1 pfmon -e ppc_inst_commit_th0,ppc_inst_commit_th1,cycles >> > long_running_program >> 4294967295 PPC_INST_COMMIT_TH0 >> 0 PPC_INST_COMMIT_TH1 >> 4294967295 CYCLES >> >> Is this a known problem? > > Yes. > The virtual 64-bit counter has not been supported on PS3. > > We have a problem to support it. > The kernel can't use the performance monitor interrupt > like counter-overflow on PS3, because the hypervisor does not support it. > So we need the polling the counter status to detect the counter-overflow. > Ouch, I was not aware of this serious limitation. Is there a possibility to use another interrupt which the hypervisor would support? I am not sure how you think you can make poilling work? Are you talking about poilling inside the kernel? ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
