On Fri, Jun 23, 2006 at 10:29:45PM -0700, Jesse Barnes wrote: > On Friday, June 23, 2006 8:24 pm, Dave Jones wrote: > > oprofile needs P6 style MSRs, it doesn't make sense to enable it on > > 586s. The performance monitoring counters were introduced with the > > PPro for Intel & athlon for AMD. The other vendors never implemented > > them (VIA still don't to this day even in their 686 flavoured C3s). > > Even for decent profiling support? I've used it in the past on my VIA > EPIA based machine with some success, so I don't think it's completely > useless, even if I'm not getting all the fancy performance counters. > E.g.: > > samples % app name symbol name > 2490 90.1847 vmlinux-2.6.16-rc5 acpi_processor_idle > 69 2.4991 vmlinux-2.6.16-rc5 acpi_safe_halt > 21 0.7606 bash (no symbols) > 21 0.7606 vmlinux-2.6.16-rc5 do_wp_page > 14 0.5071 oprofiled (no symbols) > 13 0.4708 vmlinux-2.6.16-rc5 get_page_from_freelist > 12 0.4346 ext3 (no symbols) > 11 0.3984 libc-2.4.so > __gconv_transform_utf8_internal > 11 0.3984 libc-2.4.so mbrtowc > 6 0.2173 libc-2.4.so _int_malloc > > is much better than the output I'd get from 'readprofile' after booting > with builtin support, don't you think? It's small enough, I guess turning it on isn't that big a deal. Dave -- http://www.codemonkey.org.uk
