Pinned TLB entries with 2.6 linux kernel on PPC4xx
Does the idea of creating pinned TLB entries (ones that will never be overwritten) make sense for a PPC4xx (specifically PPC405) 2.6 linux kernel? If so, how would this be accomplished? Regards, Chris -- *--Christopher Dumoulin--* Software Team Leader http://ics-ltd.com/ http://ics-ltd.com/ Interactive Circuits and Systems Ltd. 5430 Canotek Road Ottawa, ON K1J 9G2 (613)749-9241 1-800-267-9794 (USA only) This e-mail is private and confidential and is for the addressee only. If misdirected, please notify us by telephone and confirm that it has been deleted from your system and any hard copies destroyed. You are strictly prohibited from using, printing, distributing or disseminating it or any information contained in it save to the intended recipient.
Pinned TLB entries with 2.6 linux kernel on PPC4xx
On Thu, Jun 01, 2006 at 03:29:37PM -0400, Chris Dumoulin wrote: Does the idea of creating pinned TLB entries (ones that will never be overwritten) make sense for a PPC4xx (specifically PPC405) 2.6 linux kernel? If so, how would this be accomplished? 44x kernel already pins some TLB entries, 40x may use this approach to increase performance (I use this in my internal 2.4 tree quite successfully). Old 2.4 trees (linuxppc-2.4 or devel_2_4) have TLB pinning support for 40x, you can look at the implementation there. -- Eugene
Pinned TLB entries with 2.6 linux kernel on PPC4xx
On Thu, Jun 01, 2006 at 12:51:29PM -0700, Eugene Surovegin wrote: On Thu, Jun 01, 2006 at 03:29:37PM -0400, Chris Dumoulin wrote: Does the idea of creating pinned TLB entries (ones that will never be overwritten) make sense for a PPC4xx (specifically PPC405) 2.6 linux kernel? If so, how would this be accomplished? 44x kernel already pins some TLB entries, 40x may use this approach to increase performance (I use this in my internal 2.4 tree quite successfully). Old 2.4 trees (linuxppc-2.4 or devel_2_4) have TLB pinning support for 40x, you can look at the implementation there. The partial kernel lowmem pinning for ppc405 was deprecated in favor of having all of kernel lowmem covered by large pages and then large TLBs loaded on tlb misses. This is regarding 2.6, of course. It can also be extended to handle arbitrary areas other than kernel lowmem. -Matt
