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2010-08-23Staging: batman-adv: always reply batman icmp packets with primary macMarek Lindner
When receiving an batman icmp echo request or in case of a time-to-live exceeded batman would reply with the mac address of the outgoing interface which might be a secondary interface. Because secondary interfaces are not globally known this might lead to confusion. Now, replies are sent with the mac address of the primary interface. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: batman-adv: fix batman icmp originating from secondary interfaceMarek Lindner
If a batman icmp packet had to be routed over a secondary interface at the first hop, the mac address of that secondary interface would be written in the 'orig' field of the icmp packet. A node which is more than one hop away is not aware of the mac address because secondary interfaces are not flooded through the whole mesh and therefore can't send a reply. This patch always sends the mac address of the primary interface in the 'orig' field of the icmp packet. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: batman-adv: unify orig_hash_lock spinlock handling to avoid deadlocksMarek Lindner
The orig_hash_lock spinlock always has to be locked with IRQs being disabled to avoid deadlocks between code that is being executed in IRQ context and code that is being executed in non-IRQ context. Reported-by: Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: batman-adv: Fix merge of linus treeSven Eckelmann
Greg Kroah-Hartman merged Linus 2.6.36 tree in e9563355ac1175dd3440dc2ea5c28b27ed51a283 with his staging tree. Different parts of the merge conflicts were resolved incorrectly and may result in an abnormal behavior. Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: removes unused functionsJavier Martinez Canillas
Fix compilation warning removing unused functions. Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: initializa lblk variableJavier Martinez Canillas
Fix a compile warning by initializaing lblk. Since FTL_Get_Block_Index() returns BAD_BLOCK if it doesn't find the logical block number, lblk number is initizalized to BAD_BLOCK. Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: removes unused variableJavier Martinez Canillas
Fix a compile warning by removing an unused variable int i. Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: remove duplicate GLOB_VERSION definitionJavier Martinez Canillas
This is the first patch of a patchset that removes all compilations warnings in staging/spectra. These patches are a delta from a previous patchset and it assumes that these three patches all already applied: Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: don't use locked_ioctl, fix buildJavier Martinez Canillas
Last patch has a style problem. Sending the correct one. Sorry for the noise Since BKL was removed from block ioctl handling code, locked_ioctl doesn't exist anymore. Using ioctl instead and doing the locking manually. Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: use new REQ_FLUSH flag, fix build breakageJavier Martinez Canillas
REQ_TYPE_LINUX_BLOCK and REQ_LB_OP_FLUSH doesn't exist anymore. Using the new REQ_FLUSH flag instead Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23Staging: spectra: removes q->prepare_flush_fn, fix build breakageJavier Martinez Canillas
This patch is the first one of a patchset that allows stagin/spectra driver to compile in linux-next. blk_queue_ordered doesn't receive a prepare flush function anymore Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23kobject_uevent: fix typo in commentsXiaotian Feng
s/ending/sending, s/kobject_uevent()/kobject_uevent_env() in the comments. Signed-off-by: Xiaotian Feng <xtfeng@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23firmware_class: fix typo in error pathJohannes Berg
In the error path, _request_firmware sets firmware_p to NULL rather than *firmware_p, which leads to passing a freed firmware struct to drivers when the firmware file cannot be found. Fix this. Broken by commit f8a4bd3456b988fc73b2c. Reported-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23kobject: Break the kobject namespace defs into their own headerDavid Howells
Break the kobject namespace defs into their own header to avoid a header file inclusion ordering problem between linux/sysfs.h and linux/kobject.h. This fixes the build breakage on older versions of gcc. Signed-off-by: David Howells <dhowells@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-23netfilter: fix CONFIG_COMPAT supportFlorian Westphal
commit f3c5c1bfd430858d3a05436f82c51e53104feb6b (netfilter: xtables: make ip_tables reentrant) forgot to also compute the jumpstack size in the compat handlers. Result is that "iptables -I INPUT -j userchain" turns into -j DROP. Reported by Sebastian Roesner on #netfilter, closes http://bugzilla.netfilter.org/show_bug.cgi?id=669. Note: arptables change is compile-tested only. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Tested-by: Mikael Pettersson <mikpe@it.uu.se> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-23hp-wmi: Fix query interfaceMatthew Garrett
The machines I have appear to provide their return value in the arguments structure, not the output structure. Rework the driver to use that again in order to get rfkill working again. Signed-off-by: Matthew Garrett <mjg@redhat.com>
2010-08-23ACPI_TOSHIBA needs LEDS supportJonathan Corbet
Don't ask how ACPI_TOSHIBA got enabled on in desktop system's .config - I don't know. But it has silently been there until I tried 2.6.36-rc2, where it broke the build because I don't have LED support turned on. Attached patch fixes things up. (I had to change BACKLIGHT_CLASS_DEVICE to "depends" because otherwise I get unsightly core dumps out of scripts/kconfig/conf). jon -- toshiba: make sure we pull in LED support The Toshiba extras driver uses the LED module, so make sure we have it configure in. Signed-off-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Matthew Garrett <mjg@redhat.com>
2010-08-23arch/mn10300/mm: eliminate NULL dereferenceJulia Lawall
dev_name always dereferences its argument, so it should not be called if the argument is NULL. The function indeed later tests the argument for being NULL. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression dev,E; @@ *dev_name(dev) ... when != dev = E ( *dev == NULL | *dev != NULL ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-23cifs: check for NULL session passwordJeff Layton
It's possible for a cifsSesInfo struct to have a NULL password, so we need to check for that prior to running strncmp on it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-23missing changes during ntlmv2/ntlmssp auth and signShirish Pargaonkar
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-23Merge branch 'misc' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds
* 'misc' of git://git.kernel.dk/linux-2.6-block: ipheth: add support for iPhone 4
2010-08-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: ASoC: i.MX ssi: use SSI_STCCR in synchronous mode ALSA: hda - Add support for Lenovo S10-3t ALSA: hda - Fix stream and channel-ids codec-bus wide ALSA: hda - Fix conflict of sticky PCM parameter in HDMI codecs ALSA: intel8x0: Mute External Amplifier by default for ThinkPad X31 ALSA: hda - Fix build error with CONFIG_PROC_FS=n ALSA: hda - Add support for IDT 92HD89XX codecs
2010-08-23Merge branch 'fix/asoc' into for-linusTakashi Iwai
2010-08-23ASoC: i.MX ssi: use SSI_STCCR in synchronous modeSascha Hauer
In synchronous mode the SSI_SRCCR values are ignored. Instead SSI_STCCR must be used for both receiving and transmitting. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2010-08-23block: switch s390 tape_block and mg_disk to elevator_change()Jens Axboe
Now that we have this API, switch the two in-kernel users to it. Resolves an oops introduced by commit 1abec4fdbb142e3ccb6ce99832fae42129134a96. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23block: add function call to switch the IO scheduler from a driverJens Axboe
Currently drivers must do an elevator_exit() + elevator_init() to switch IO schedulers. There are a few problems with this: - Since commit 1abec4fdbb142e3ccb6ce99832fae42129134a96, elevator_init() requires a zeroed out q->elevator pointer. The two existing in-kernel users don't do that. - It will only work at initialization time, since using the above two-staged construct does not properly quisce the queue. So add elevator_change() which takes care of this, and convert the elv_iosched_store() sysfs interface to use this helper as well. Reported-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Reported-by: Kevin Vigor <kevin@vigor.nu> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23powerpc/47x: Add an isync before the tlbivax instructionDave Kleikamp
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2010-08-23powerpc/4xx: Index interrupt stacks by physical cpuDave Kleikamp
The interrupt stacks need to be indexed by the physical cpu since the critical, debug and machine check handlers use the contents of SPRN_PIR to index the critirq_ctx, dbgirq_ctx, and mcheckirq_ctx arrays. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2010-08-23powerpc/47x: Remove redundant line from cputable.cDave Kleikamp
There are two entries for .cpu_user_features in arch/powerpc/kernel/cputable.c. Remove the one that doesn't belong Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2010-08-23fs/bio-integrity.c: return -ENOMEM on kmalloc failureAndrew Morton
Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23powerpc/47x: Make sure mcsr is cleared before enabling machine check interruptsDave Kleikamp
Clear the machine check syndrom register before enabling machine check interrupts. The initial state of the tlb can lead to parity errors being flagged early after a cold boot. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2010-08-23bio-integrity.c: remove dependency on __GFP_NOFAILDavid Rientjes
The kmalloc() in bio_integrity_prep() is failable, so remove __GFP_NOFAIL from its mask. Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23powerpc/4xx: Device tree update for the 460ex DWC SATARupjyoti Sarmah
Device tree update for the Applied micro processor 460ex on-chip SATA Signed-off-by: Rupjyoti Sarmah <rsarmah@amcc.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2010-08-23xen: pvhvm: make it clearer that XEN_UNPLUG_* define bits in a bitfieldIan Campbell
by defining in terms of (1<<N). XEN_UNPLUG_UNNECESSARY and XEN_UNPLUG_NEVER are only used within the kernel and are not defined as a bit on the unplug IO port. Therefore use a bit which is outside the potentially valid range of the 16 bit IO port. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-23xen: pvhvm: rename xen_emul_unplug=ignore to =unnnecessaryIan Campbell
It is not immediately clear what this option causes to become ignored. The actual meaning is that it is not necessary to unplug the emulated devices to safely use the PV ones, even if the platform does not support the unplug protocol. (pressumably the user will only add this option if they have ensured that their domain configuration is safe). I think xen_emul_unplug=unnecessary better captures this. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-23xen: pvhvm: allow user to request no emulated device unplugIan Campbell
this allows the user to disable pvhvm and revert to emulated devices in case of a system misconfiguration (e.g. initramfs with only emulated drivers in it). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-23ipheth: add support for iPhone 4Jens Axboe
This adds support for the iPhone 4 to the ipheth driver. Acked-by: Diego Giagio <diego@giagio.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23BLOCK: fix bio.bi_rw handlingJiri Slaby
Return of the bi_rw tests is no longer bool after commit 74450be1. But results of such tests are stored in bools. This doesn't fit in there for some compilers (gcc 4.5 here), so either use !! magic to get real bools or use ulong where the result is assigned somewhere. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23block: put dev->kobj in blk_register_queue fail pathXiaotian Feng
kernel needs to kobject_put on dev->kobj if elv_register_queue fails. Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Nikanth Karthikesan <knikanth@suse.de> Cc: David Teigland <teigland@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cciss: handle allocation failureDan Carpenter
If kmalloc() fails then cleanup and return failure (-1). Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cfq-iosched: Documentation help for new tunablesVivek Goyal
Some documentation to provide help with tunables. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cfq-iosched: blktrace print per slice sector statsVivek Goyal
o Divyesh had gotten rid of this code in the past. I want to re-introduce it back as it helps me a lot during debugging. Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Reviewed-by: Divyesh Shah <dpshah@google.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cfq-iosched: Implement tunable group_idleVivek Goyal
o Implement a new tunable group_idle, which allows idling on the group instead of a cfq queue. Hence one can set slice_idle = 0 and not idle on the individual queues but idle on the group. This way on fast storage we can get fairness between groups at the same time overall throughput improves. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cfq-iosched: Do group share accounting in IOPS when slice_idle=0Vivek Goyal
o Implement another CFQ mode where we charge group in terms of number of requests dispatched instead of measuring the time. Measuring in terms of time is not possible when we are driving deeper queue depths and there are requests from multiple cfq queues in the request queue. o This mode currently gets activated if one sets slice_idle=0 and associated disk supports NCQ. Again the idea is that on an NCQ disk with idling disabled most of the queues will dispatch 1 or more requests and then cfq queue expiry happens and we don't have a way to measure time. So start providing fairness in terms of IOPS. o Currently IOPS mode works only with cfq group scheduling. CFQ is following different scheduling algorithms for queue and group scheduling. These IOPS stats are used only for group scheduling hence in non-croup mode nothing should change. o For CFQ group scheduling one can disable slice idling so that we don't idle on queue and drive deeper request queue depths (achieving better throughput), at the same time group idle is enabled so one should get service differentiation among groups. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23cfq-iosched: Do not idle if slice_idle=0Vivek Goyal
Do not idle either on cfq queue or service tree if slice_idle=0. User does not want any queue or service tree idling. Currently even if slice_idle=0, we were waiting for request to finish before expiring the queue and that can lead to lower queue depths. Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23workqueue: mark lock acquisition on worker_maybe_bind_and_lock()Namhyung Kim
worker_maybe_bind_and_lock() actually grabs gcwq->lock but was missing proper annotation. Add it. So this patch will remove following sparse warnings: kernel/workqueue.c:1214:13: warning: context imbalance in 'worker_maybe_bind_and_lock' - wrong count at exit arch/x86/include/asm/irqflags.h:44:9: warning: context imbalance in 'worker_rebind_fn' - unexpected unlock kernel/workqueue.c:1991:17: warning: context imbalance in 'rescuer_thread' - unexpected unlock Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2010-08-23workqueue: annotate lock context changeNamhyung Kim
Some of internal functions called within gcwq->lock context releases and regrabs the lock but were missing proper annotations. Add it. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2010-08-23cciss: disable doorbell reset on reset_devicesStephen M. Cameron
The doorbell reset initially appears to work correctly, the controller resets, comes up, some i/o can even be done, but on at least some Smart Arrays in some servers, it eventually causes a subsequent controller lockup due to some kind of PCIe error, and kdump can end up leaving the root filesystem in an unbootable state. For this reason, until the problem is fixed, or at least isolated to certain hardware enough to be avoided, the doorbell reset should not be used at all. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23blkio: Fix return code for mkdir callsCiju Rajan K
If the cgroup hierarchy for blkio control groups is deeper than two levels, kernel should not allow the creation of further levels. mkdir system call does not except EINVAL as a return value. This patch replaces EINVAL with more appropriate EPERM Signed-off-by: Ciju Rajan K <ciju@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-23mutex: Improve the scalability of optimistic spinningTim Chen
There is a scalability issue for current implementation of optimistic mutex spin in the kernel. It is found on a 8 node 64 core Nehalem-EX system (HT mode). The intention of the optimistic mutex spin is to busy wait and spin on a mutex if the owner of the mutex is running, in the hope that the mutex will be released soon and be acquired, without the thread trying to acquire mutex going to sleep. However, when we have a large number of threads, contending for the mutex, we could have the mutex grabbed by other thread, and then another ……, and we will keep spinning, wasting cpu cycles and adding to the contention. One possible fix is to quit spinning and put the current thread on wait-list if mutex lock switch to a new owner while we spin, indicating heavy contention (see the patch included). I did some testing on a 8 socket Nehalem-EX system with a total of 64 cores. Using Ingo's test-mutex program that creates/delete files with 256 threads (http://lkml.org/lkml/2006/1/8/50) , I see the following speed up after putting in the mutex spin fix: ./mutex-test V 256 10 Ops/sec 2.6.34 62864 With fix 197200 Repeating the test with Aim7 fserver workload, again there is a speed up with the fix: Jobs/min 2.6.34 91657 With fix 149325 To look at the impact on the distribution of mutex acquisition time, I collected the mutex acquisition time on Aim7 fserver workload with some instrumentation. The average acquisition time is reduced by 48% and number of contentions reduced by 32%. #contentions Time to acquire mutex (cycles) 2.6.34 72973 44765791 With fix 49210 23067129 The histogram of mutex acquisition time is listed below. The acquisition time is in 2^bin cycles. We see that without the fix, the acquisition time is mostly around 2^26 cycles. With the fix, we the distribution get spread out a lot more towards the lower cycles, starting from 2^13. However, there is an increase of the tail distribution with the fix at 2^28 and 2^29 cycles. It seems a small price to pay for the reduced average acquisition time and also getting the cpu to do useful work. Mutex acquisition time distribution (acq time = 2^bin cycles): 2.6.34 With Fix bin #occurrence % #occurrence % 11 2 0.00% 120 0.24% 12 10 0.01% 790 1.61% 13 14 0.02% 2058 4.18% 14 86 0.12% 3378 6.86% 15 393 0.54% 4831 9.82% 16 710 0.97% 4893 9.94% 17 815 1.12% 4667 9.48% 18 790 1.08% 5147 10.46% 19 580 0.80% 6250 12.70% 20 429 0.59% 6870 13.96% 21 311 0.43% 1809 3.68% 22 255 0.35% 2305 4.68% 23 317 0.44% 916 1.86% 24 610 0.84% 233 0.47% 25 3128 4.29% 95 0.19% 26 63902 87.69% 122 0.25% 27 619 0.85% 286 0.58% 28 0 0.00% 3536 7.19% 29 0 0.00% 903 1.83% 30 0 0.00% 0 0.00% I've done similar experiments with 2.6.35 kernel on smaller boxes as well. One is on a dual-socket Westmere box (12 cores total, with HT). Another experiment is on an old dual-socket Core 2 box (4 cores total, no HT) On the 12-core Westmere box, I see a 250% increase for Ingo's mutex-test program with my mutex patch but no significant difference in aim7's fserver workload. On the 4-core Core 2 box, I see the difference with the patch for both mutex-test and aim7 fserver are negligible. So far, it seems like the patch has not caused regression on smaller systems. Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: <stable@kernel.org> # .35.x LKML-Reference: <1282168827.9542.72.camel@schen9-DESK> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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