On Mon, 6 Apr 2009, Geert Uytterhoeven wrote: > On Fri, 3 Apr 2009, Kumar Gala wrote: > > On Apr 3, 2009, at 7:08 AM, Geert Uytterhoeven wrote: > > >Finally (after ca. 1.5 years), he're an updated version of my patch to keep > > >track of emulated instructions. In the light of Kumar's `Emulate enough of > > >SPE > > >instructions to make gcc happy' patch, he probably also wants to keep track > > >of > > >the actual runtime overhead. > > > > > >Changes since last version: > > > - arch/powerpc/kernel/sysfs.c is now compiled on ppc32, so we can provide > > > counters in sysfs on ppc32, too, > > > - WARN_EMULATED() is a no-op if CONFIG_SYSCTL is disabled, > > > - Add warnings for altivec, > > > - Add warnings for recently introduced emulation of vsx and isel > > > instructions. > > > > pretty cool. Do we think counters should be sysfs or debugfs? > > What do you prefer? > > On MIPS, unaligned exception handling control is in debugfs.
And probably debugfs is better, so it's disabled on production systems. But I would drop the per-CPU counters, and keep global counters only, for simplicity. > > Also it would be nice to be able to zero out the counters. > > By writing to the individual counters, or by writing to a global `clear' file? With debugfs, it's quite easy to make them writable, so you can easily clear them by writing zeroes to the virtual files. If people agree, I'll find a time hole and start updating the code... With kind regards, Geert Uytterhoeven Software Architect Techsoft Centre Technology and Software Centre Europe The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium Phone: +32 (0)2 700 8453 Fax: +32 (0)2 700 8622 E-mail: geert.uytterhoe...@sonycom.com Internet: http://www.sony-europe.com/ A division of Sony Europe (Belgium) N.V. VAT BE 0413.825.160 · RPR Brussels Fortis · BIC GEBABEBB · IBAN BE41293037680010 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
