- 09 Nov, 2005 40 commits
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Nick Piggin authored
Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce confusion, and make their semantics rigid. Improves efficiency of resched_task and some cpu_idle routines. * In resched_task: - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held, and as we hold it during resched_task, then there is no need for an atomic test and set there. The only other time this should be set is when the task's quantum expires, in the timer interrupt - this is protected against because the rq lock is irq-safe. - If TIF_NEED_RESCHED is set, then we don't need to do anything. It won't get unset until the task get's schedule()d off. - If we are running on the same CPU as the task we resched, then set TIF_NEED_RESCHED and no further action is required. - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set after TIF_NEED_RESCHED has been set, then we need to send an IPI. Using these rules, we are able to remove the test and set operation in resched_task, and make clear the previously vague semantics of POLLING_NRFLAG. * In idle routines: - Enter cpu_idle with preempt disabled. When the need_resched() condition becomes true, explicitly call schedule(). This makes things a bit clearer (IMO), but haven't updated all architectures yet. - Many do a test and clear of TIF_NEED_RESCHED for some reason. According to the resched_task rules, this isn't needed (and actually breaks the assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock held). So remove that. Generally one less locked memory op when switching to the idle thread. - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner most polling idle loops. The above resched_task semantics allow it to be set until before the last time need_resched() is checked before going into a halt requiring interrupt wakeup. Many idle routines simply never enter such a halt, and so POLLING_NRFLAG can be always left set, completely eliminating resched IPIs when rescheduling the idle task. POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs. Signed-off-by:
Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Con Kolivas <kernel@kolivas.org> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Nick Piggin authored
Run idle threads with preempt disabled. Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()). How did it ever work before? Might fix the CPU hotplugging hang which Nigel Cunningham noted. We think the bug hits if the idle thread is preempted after checking need_resched() and before going to sleep, then the CPU offlined. After calling stop_machine_run, the CPU eventually returns from preemption and into the idle thread and goes to sleep. The CPU will continue executing previous idle and have no chance to call play_dead. By disabling preemption until we are ready to explicitly schedule, this bug is fixed and the idle threads generally become more robust. From: alexs <ashepard@u.washington.edu> PPC build fix From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> MIPS build fix Signed-off-by:
Yoichi Yuasa <yuasa@hh.iij4u.or.jp> Signed-off-by:
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Con Kolivas authored
The intermittent scheduling of the migration thread at ultra high priority makes the smp nice handling see that runqueue as being heavily loaded. The migration thread itself actually handles the balancing so its influence on priority balancing should be ignored. Signed-off-by:
Con Kolivas <kernel@kolivas.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
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Con Kolivas authored
The priority biasing was off by mutliplying the total load by the total priority bias and this ruins the ratio of loads between runqueues. This patch should correct the ratios of loads between runqueues to be proportional to overall load. -2nd attempt. From: Dave Kleikamp <shaggy@austin.ibm.com> This patch fixes a divide-by-zero error that I hit on a two-way i386 machine. rq->nr_running is tested to be non-zero, but may change by the time it is used in the division. Saving the value to a local variable ensures that the same value that is checked is used in the division. Signed-off-by:
Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by:
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Con Kolivas authored
To intensify the 'nice' support across physical cpus on SMP we can bias the loads on idle rebalancing. To prevent idle rebalance from trying to pull tasks from queues that appear heavily loaded we only bias the load if there is more than one task running. Add some minor micro-optimisations and have only one return from __source_load and __target_load functions. Fix the fact that target_load was not biased by priority when type == 0. Signed-off-by:
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Con Kolivas authored
Real time tasks' effect on prio_bias should be based on their real time priority level instead of their static_prio which is based on nice. Signed-off-by:
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Con Kolivas authored
prio_bias should only be adjusted in set_user_nice if p is actually currently queued. Signed-off-by:
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Con Kolivas authored
This patch implements 'nice' support across physical cpus on SMP. It introduces an extra runqueue variable prio_bias which is the sum of the (inverted) static priorities of all the tasks on the runqueue. This is then used to bias busy rebalancing between runqueues to obtain good distribution of tasks of different nice values. By biasing the balancing only during busy rebalancing we can avoid having any significant loss of throughput by not affecting the carefully tuned idle balancing already in place. If all tasks are running at the same nice level this code should also have minimal effect. The code is optimised out in the !CONFIG_SMP case. Signed-off-by:
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Ricardo Cerqueira authored
- Saa7134-alsa can only be autoloaded after saa7134 is active - Applied pertinent changes proposed by the ALSA team - dsp_nr replaced by ALSA's index[] Signed-off-by:
Ricardo Cerqueira <v4l@cerqueira.org> Signed-off-by:
Mauro Carvalho Chehab <mchehab@brturbo.com.br> Signed-off-by:
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Ricardo Cerqueira authored
Saa7134-alsa is now a standalone module Signed-off-by:
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Mauro Carvalho Chehab authored
States a date for removing V4L1 API Signed-off-by:
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Mauro Carvalho Chehab authored
- Fixed autodetection of max size by if alternate setting - Fixed some debug messages Signed-off-by:
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Torsten Seeboth authored
Improves the audio handling for NICAM on cx88 audio. Signed-off-by:
Torsten Seeboth <Torsten.Seeboth@t-online.de> Signed-off-by:
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Hans Verkuil authored
- Adds missing msp34xxg_reset to VIDIOC_S_STD (just like VIDIOCSCHAN). - Improves msp3400 debug messages. Now, all kernel message in msp3400.c use the same prefix and include the I2C bus to differentiate between multiple msp3400 I2C chips. - Correctly prints the chip identifier for the msp44xx chips. - msp34xxg cleanups. Signed-off-by:
Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by:
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Mauro Carvalho Chehab authored
Fixes set_scart parameter definitions and AUDOUT ioctl Signed-off-by:
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Hans Verkuil authored
Fixes compilation problems due removal of media/id.h and I2C_ALGO_BIT Signed-off-by:
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Mauro Carvalho Chehab authored
Fixes saa7134-alsa build inside saa7134 driver. Signed-off-by:
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Ricardo Cerqueira authored
Use less-generic name for saa7134 card #79 Signed-off-by:
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Ricardo Cerqueira authored
SAA713x cards with i2c remotes now autoload ir-kbd-i2c (disable_ir works, as it does for GPIO remotes) Signed-off-by:
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Tyler Trafford authored
Added support for NTSC 4.43 video standard. Signed-off-by:
Tyler Trafford <tatrafford@comcast.net> Signed-off-by:
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Michael Krufky authored
Updated CARDLIST and strip trailing whitespace. Signed-off-by:
Michael Krufky <mkrufky@m1k.net> Signed-off-by:
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Hartmut Hackmann authored
- Added dvb-t support for Asus P7134 Dual - added pci id for ADS Tech Instant TV cardbus variant Signed-off-by:
Hartmut Hackmann <hartmut.hackmann@t.online.de> Signed-off-by:
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Mauro Carvalho Chehab authored
- Em28xx cleanups and fixes. - Some cleanups and audio amux adjust. - em28xx will allways try, by default, the biggest size alt. - Fixes audio mux code. - Fixes some logs. - Adds support for digital output for WinTV USB2 board. Signed-off-by:
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Pavel Mihaylov authored
Remote and more info for PCTV Cardbus. Whitespace cleanup. Signed-off-by:
Pavel Mihaylov <bin@bash.info> Signed-off-by:
Nickolay V. Shmyrev <nshmyrev@yandex.ru> Signed-off-by:
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Hartmut Hackmann authored
Added dvb support for tda8275a (Philips Tiger reference design) Signed-off-by:
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Michael Krufky authored
Saa6588.c should build saa6588.ko, rather than rds.ko Signed-off-by:
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Kirk Lapray authored
Added function for nxt200x to change pll input Signed-off-by:
Kirk Lapray <kirk.lapray@gmail.com> Signed-off-by:
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Hans J. Koch authored
Fix RDS raw data buffer handling bug, which caused decoding delays and sometimes wrong data. Signed-off-by:
Hans J. Koch <koch@hjk-az.de> Signed-off-by:
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Hartmut Hackmann authored
Fixed tda8290 SECAM-L Signed-off-by:
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Mauro Carvalho Chehab authored
- Removed media id.h file Signed-off-by:
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Mauro Carvalho Chehab authored
- Miscelaneous fixes for em28xx - I2C hardware named changed to wright value. - utsname included to em28xx-video.c - Makefile fixes. Signed-off-by:
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Mauro Carvalho Chehab authored
- Fixing headers to compile cleanly. Signed-off-by:
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Michael Krufky authored
Adapt to changes in v4l tree: rename BTTV_FOO --> BTTV_BOARD_FOO Signed-off-by:
Michael Krufky <mkrufky@linuxtv.org> Signed-off-by:
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Lubomir Bulej authored
- New Avermedia 303 card (without radio). Signed-off-by:
Lubomir Bulej <bulej@nenya.ms.mff.cuni.cz> Signed-off-by:
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Ricardo Cerqueira authored
- Work-around to allow hybrid DVB card to autoload the tda9887 Signed-off-by:
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Ricardo Cerqueira authored
- Rollback recent i2c change to solve tuner detection breakage Signed-off-by:
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Michael Krufky authored
- Correct nicam audio settings to match dscaler Signed-off-by:
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Michael Krufky authored
- Change CONFIG_EM28XX to CONFIG_VIDEO_EM28XX Signed-off-by:
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Michael Krufky authored
- Fixed typo. Signed-off-by:
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Michael Krufky authored
- Add em28xx to kernel build. Signed-off-by:
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