Date: Thu, 19 Jul 2007 01:01:47 +0200 From: Rene Ladan <r.c.ladan@gmail.com> To: Jeff Roberson <jroberson@chesapeake.net> Cc: current@freebsd.org Subject: Re: ULE/SCHED_SMP diff for 7.0 Message-ID: <469E9BDB.7020500@gmail.com> In-Reply-To: <20070718150613.W561@10.0.0.1> References: <20070716233030.D92541@10.0.0.1> <469E83F8.3090103@gmail.com> <20070718142649.Y561@10.0.0.1> <469E897B.7080100@gmail.com> <20070718150613.W561@10.0.0.1>
next in thread | previous in thread | raw e-mail | index | archive | help
Jeff Roberson schreef: > > On Wed, 18 Jul 2007, Rene Ladan wrote: > >> Jeff Roberson schreef: >>> >>> On Wed, 18 Jul 2007, Rene Ladan wrote: >>> >>>> Jeff Roberson schreef: >>>>> http://people.freebsd.org/~jeff/ule.diff >>>>> >>>>> This patch is scheduled for inclusion in 7.0. I would like anyone who >>>>> cares to run it to validate that it does not create any stability or >>>>> performance regression over the existing ULE. This patch replaces ULE >>>>> with SCHED_SMP, which will now no longer exist as a seperate fork of >>>>> ULE. >>>> [..] >>>> >>>> I cvsupped this evening at 19:34 UTC. The new ULE scheduler works fine >>>> in single-user mode (it survives "make kernel"), but when I go to >>>> multi-user mode I get a "sched_add: trying to run inhibited thread" >>>> panic (2 vmcores lost due to fsck :( ) >>> >>> Can you get me a backtrace? You can enable KDB and DDB in your kernel >>> along with INVARIANTS. Just type 'tr' and record the function names >>> >> >> I found a file #165060 in /var/lost+found . kgdb didn't eat it, but >> strings >> could still extract the attached backtrace. In case you want to >> recompile >> the kernel, it is compiled with -O1 -pipe -march=prescott >> -fno-strict-aliasing > > Can you run gdb kernel.debug from your compile directory. Then type: > > list *(sched_switch+0x26e) > > I need to know the line number of that call. Sure: root@195-241-221-201:/usr/obj/usr/src/sys/RENE#gdb kernel.debug (gdb) list *(sched_switch+0x26e) 0xc051c7b0 is in sched_switch (/usr/src/sys/kern/sched_ule.c:1761). 1756 /* XXX This is bogus. What if the thread is locked elsewhere? */ 1757 td->td_lock = TDQ_LOCKPTR(tdq); 1758 td->td_sched->ts_cpu = cpuid; 1759 tdq_add(tdq, td, SRQ_YIELDING); 1760 } 1761 newtd = choosethread(); 1762 /* 1763 * Call the MD code to switch contexts if necessary. 1764 */ 1765 if (td != newtd) { This on an i386. Regards, Rene -- GPG fingerprint = E738 5471 D185 7013 0EE0 4FC8 3C1D 6F83 12E1 84F6 (subkeys.pgp.net) "It won't fit on the line." -- me, 2001
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?469E9BDB.7020500>