[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [XenPPC] performance profiling current and future steps
Jimi Xenidis wrote: ... Ensure MMCR0[FCH] for this first step:-(ensure) set MMCR[FCH] always in xen when entering xen space. This should prevent a domainmessing up MMCR0[FCH] ->EXCEPTION_HEAD in exception.S set MMCR0[FCH] alwaysYou need at least the following instructions: mfspr r0, SPRN_MMCR0 ori r0, r0, 1 /* MMRC0_FCH */ mtspr 795, SPRN_MMCR0Unfortuantely, there is not enough room in EXCEPTION_HEAD for that and you will get:exceptions.S: Assembler messages: exceptions.S:246: Error: attempt to .org/.space backwards? (-4) exceptions.S:253: Error: attempt to .org/.space backwards? (-4) exceptions.S:260: Error: attempt to .org/.space backwards? (-4) exceptions.S:267: Error: attempt to .org/.space backwards? (-4) exceptions.o: Bad value exceptions.S:626: FATAL: Can't write exceptions.o: Bad valueI suggest we start a new macro PMU_SAVE_STATE(save,scratch), which does the above (for now, using only scratch) and sprinkling it in all the code that EXCEPTION_HEAD branches to. Yep, I had those already: mfspr r0,SPRN_MMCR0 /* ensure MMCR0[FCH]=1 */ ori r0,r0,MMCR0_FCH mtspr SPRN_MMCR0, r0Do you mean to insert a branch to PMU_SAVE_STATE from EXCEPTION_HEAD or to put a PMU_SAVE_STATE branch to every section calling EXCEPTION_HEAD ? Can someone please point at a code piece that does a similar macro definition and branch already. Alternatively we could setup an "assist" session with screen -x developing this part together if there is a volunteer. I created this one blindly now as a start .macro PMU_SAVE_STATE save scratchmfspr \scratch,SPRN_MMCR0 /* ensure MMCR0[FCH]=1, not yet saving anything */ ori \scratch,\scratch,MMCR0_FCH mtspr SPRN_MMCR0, \scratch .endmand added the following to EXCEPTION_HEAD, but I guess it it wrong that way ;) PMU_SAVE_STATE r0 r0 --Grüsse / regards, Christian Ehrhardt IBM Linux Technology Center, Open Virtualization +49 7031/16-3385 Ehrhardt@xxxxxxxxxxxxxxxxxxx Ehrhardt@xxxxxxxxxx IBM Deutschland Entwicklung GmbHVorsitzender des Aufsichtsrats: Johann Weihen Geschäftsführung: Herbert Kircher Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294 _______________________________________________ Xen-ppc-devel mailing list Xen-ppc-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ppc-devel
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