On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > We are pleased to announce the next update to our new preempt-rt > series. > > - Forward to 2.6.33-rc8 > > Finally I managed to get that beast tamed. > > Some folks were already joking, that my dog ate the 33-rt patch. The > truth is that my reject fixup skills were one line off in the mm/* > code which resulted in -rt eating my files :) > > When I fixed the wreckage of my own stupidty I found out that -rt > triggered a nasty and hard to reproduce mainline scheduler bug, which > refused to reproduce with kernel tracing enabled. Thanks to Peter > Zijlstra for helping me to decode the initial mainline problem and the > ones which resulted from fixing the mainline bug! > > It's all fixed now and I'm pretty happy about the state of this > release with the following exceptions: > > 1) it is only runtime tested on x86_64 (compiles on x86_32, arm, > powerpc_32/64). > > I'm going to throw it at my testing infrastructure tomorrow, but I > wanted to release this before .33-final and of course you folks > are heartely invited to help out with fixing the fallout :) > > 2) I broke the histogram tracer stuff simply because I got lost in > the divergence of -rt and mainline kernel/trace/* changes > > I apologize to Carsten, but I'm sure he will fix that in no time > as usual > > The current state of the patch on x86_64 is: rock stable! > > [rt-tests]# chrt -f 1 ./cyclictest -t -a -n -d0 -p80 -i125 > policy: fifo: loadavg: 509.19 490.53 486.66 364/1055 31899 > > T: 0 (27682) P:80 I:125 C:1170997397 Min: 2 Act: 3 Avg: 3 Max: 34 > T: 1 (27683) P:79 I:125 C:1170997397 Min: 2 Act: 3 Avg: 3 Max: 34 > > That's an uptime of ~1.6 days with a load of hackbench, recursive > grep and extensive networking traffic going on. > > The merge of the spinlock namespace cleanup and the initial > annotations took a big chunk away from the -rt patch size: > > patch-2.6.31.12-rt21.patch 1680354 > patch-2.6.33-rc8.patch 1179390 > patch-2.6.33-rc8+git.patch 1067064 > > We are zooming in, but there is still a way to go! > Woohoo! More -rt fun. Unfortunately, I can't log in on my T500 with this kernel though. The following shows-up on my serial console. ------------[ cut here ]------------ WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0 x721 [mac80211]() Hardware name: 2241B48 Modules linked in: bridge stp bnep sco btusb l2cap crc16 bluetooth sunrpc ipt_RE JECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT xt_tc pudp nf_conntrack_ipv6 xt_state ip6table_filter ip6_tables x_tables ipv6 cpufreq _ondemand acpi_cpufreq ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_multi path scsi_dh dm_mod kvm_intel kvm uinput arc4 ecb snd_hda_codec_conexant iwlagn snd_hda_intel iwlcore snd_hda_codec snd_hwdep snd_seq_dummy mac80211 snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss thinkpad_ac pi snd_pcm firewire_ohci firewire_core hwmon video ppdev tpm_tis cfg80211 sr_mod battery wmi ricoh_mmc parport_pc sg tpm cdrom tpm_bios button ac ata_generic e1 000e iTCO_wdt snd_timer sdhci_pci pata_acpi sdhci i2c_i801 i2c_core parport mmc_ core iTCO_vendor_support snd joydev snd_page_alloc pcspkr intel_agp soundcore cr c_itu_t rfkill output ahci libata sd_mod scsi_mod crc_t10dif xfs exportfs uhci_h cd ohci_hcd ehci_hcd [last unloaded: microcode] Pid: 10, comm: sirq-tasklet/0 Not tainted 2.6.33-rc8-rt1-debug #1 Call Trace: [<ffffffffa033524f>] ? ieee80211_rx+0x4c/0x721 [mac80211] [<ffffffff81041f25>] warn_slowpath_common+0x77/0xa4 [<ffffffff81041f61>] warn_slowpath_null+0xf/0x11 [<ffffffffa033524f>] ieee80211_rx+0x4c/0x721 [mac80211] [<ffffffffa039f380>] ? iwl_led_pattern+0x17a/0x189 [iwlcore] [<ffffffff810c0fd1>] ? free_compound_page+0x16/0x18 [<ffffffffa039f3f5>] ? iwl_leds_background+0x66/0x219 [iwlcore] [<ffffffffa0393524>] iwl_rx_reply_rx+0xc29/0xc5a [iwlcore] [<ffffffff8106ee74>] ? trace_hardirqs_on+0xd/0xf [<ffffffff8135cf7e>] ? _raw_spin_unlock_irqrestore+0x4c/0x68 [<ffffffff811b4e32>] ? unmap_single+0x27/0x4f [<ffffffffa03cec81>] iwl_rx_handle+0x2a0/0x48d [iwlagn] [<ffffffff8135cf7e>] ? _raw_spin_unlock_irqrestore+0x4c/0x68 [<ffffffffa03cfbb3>] iwl_irq_tasklet+0x5a3/0x73f [iwlagn] [<ffffffff81047b5a>] __tasklet_action+0x8f/0xfd [<ffffffff81047cc9>] tasklet_action+0x7c/0x85 [<ffffffff81048209>] run_ksoftirqd+0x18e/0x2d5 [<ffffffff8104807b>] ? run_ksoftirqd+0x0/0x2d5 [<ffffffff8105d794>] kthread+0x8c/0x94 [<ffffffff8135cfca>] ? _raw_spin_unlock+0x30/0x4b [<ffffffff81003a54>] kernel_thread_helper+0x4/0x10 [<ffffffff8135d340>] ? restore_args+0x0/0x30 [<ffffffff8105d708>] ? kthread+0x0/0x94 [<ffffffff81003a50>] ? kernel_thread_helper+0x0/0x10 ---[ end trace 01358557eee38037 ]--- Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
