linaro-dev July 2013

linaro-dev@lists.linaro.org

28 participants
26 discussions

[PATCH V2 Resend 0/4] Create sched_select_cpu() and use it for workqueues and timers

by Viresh Kumar

Hi All, This is V2 Resend of my sched_select_cpu() work. Resend because didn't got much attention on V2. Including more guys now in cc :) In order to save power, it would be useful to schedule work onto non-IDLE cpus instead of waking up an IDLE one. To achieve this, we need scheduler to guide kernel frameworks (like: timers & workqueues) on which is the most preferred CPU that must be used for these tasks. This patchset is about implementing this concept. - The first patch adds sched_select_cpu() routine which returns the preferred cpu which is non-idle. - Second patch removes idle_cpu() calls from timer & hrtimer. - Third patch is about adapting this change in workqueue framework. - Fourth patch add migration capability in running timer Earlier discussions over v1 can be found here: http://www.mail-archive.com/linaro-dev@lists.linaro.org/msg13342.html Earlier discussions over this concept were done at last LPC: http://summit.linuxplumbersconf.org/lpc-2012/meeting/90/lpc2012-sched-timer… Module created for testing this behavior is present here: http://git.linaro.org/gitweb?p=people/vireshk/module.git;a=summary Following are the steps followed in test module: 1. Run single work on each cpu 2. This work will start a timer after x (tested with 10) jiffies of delay 3. Timer routine queues a work... (This may be called from idle or non-idle cpu) and starts the same timer again STEP 3 is done for n number of times (i.e. queuing n works, one after other) 4. All works will call a single routine, which will count following per cpu: - Total works processed by a CPU - Total works processed by a CPU, which are queued from it - Total works processed by a CPU, which aren't queued from it Setup: ----- - ARM Vexpress TC2 - big.LITTLE CPU - Core 0-1: A15, 2-4: A7 - rootfs: linaro-ubuntu-nano Results: ------- Without Workqueue Modification, i.e. PATCH 3/3: [ 2493.022335] Workqueue Analyser: works processsed by CPU0, Total: 1000, Own: 0, migrated: 0 [ 2493.047789] Workqueue Analyser: works processsed by CPU1, Total: 1000, Own: 0, migrated: 0 [ 2493.072918] Workqueue Analyser: works processsed by CPU2, Total: 1000, Own: 0, migrated: 0 [ 2493.098576] Workqueue Analyser: works processsed by CPU3, Total: 1000, Own: 0, migrated: 0 [ 2493.123702] Workqueue Analyser: works processsed by CPU4, Total: 1000, Own: 0, migrated: 0 With Workqueue Modification, i.e. PATCH 3/3: [ 2493.022335] Workqueue Analyser: works processsed by CPU0, Total: 1002, Own: 999, migrated: 3 [ 2493.047789] Workqueue Analyser: works processsed by CPU1, Total: 998, Own: 997, migrated: 1 [ 2493.072918] Workqueue Analyser: works processsed by CPU2, Total: 1013, Own: 996, migrated: 17 [ 2493.098576] Workqueue Analyser: works processsed by CPU3, Total: 998, Own: 993, migrated: 5 [ 2493.123702] Workqueue Analyser: works processsed by CPU4, Total: 989, Own: 987, migrated: 2 V2->V2-Resend ------------- - Included timer migration patch in the same thread. V1->V2 ----- - New SD_* macros removed now and earlier ones used - sched_select_cpu() rewritten and it includes the check on current cpu's idleness. - cpu_idle() calls from timer and hrtimer removed now. - Patch 2/3 from V1, removed as it doesn't apply to latest workqueue branch from tejun. - CONFIG_MIGRATE_WQ removed and so is wq_select_cpu() - sched_select_cpu() called only from __queue_work() - got tejun/for-3.7 branch in my tree, before making workqueue changes. Viresh Kumar (4): sched: Create sched_select_cpu() to give preferred CPU for power saving timer: hrtimer: Don't check idle_cpu() before calling get_nohz_timer_target() workqueue: Schedule work on non-idle cpu instead of current one timer: Migrate running timer include/linux/sched.h | 16 ++++++++++-- include/linux/timer.h | 2 ++ kernel/hrtimer.c | 2 +- kernel/sched/core.c | 69 +++++++++++++++++++++++++++++++-------------------- kernel/timer.c | 50 ++++++++++++++++++++++--------------- kernel/workqueue.c | 4 +-- 6 files changed, 91 insertions(+), 52 deletions(-) -- 1.7.12.rc2.18.g61b472e

10 years, 5 months

[Query]: Can people post to this mailing list without subscription?

by Viresh Kumar

Hi Guys, I really don't know whom to direct this mail to and hence the wide spread. Problem: When we send a mail to kernel mailing lists with linaro-dev or linaro-kernel in cc, and we get replies to those mails, sometimes the mails from outside people doesn't reach us back on linaro mailing lists. And i hope the reason behind that is those people aren't subscribed to these lists. For me it makes some sense to allow anyone to send mails to this list. Can that request be considered? I believe the idea behind blocking such use is for protecting against spam mails, but these mails/replies are really important and we certainly need them delivered to us. One solution (don't know if its possible) would be to monitor mails from non-subscribers and few people from Linaro can permit them on daily/hourly basis, so that we don't get any spam mails, but that would be a burden. -- viresh

10 years, 7 months

Release Critical Test Result Summary of Calendar Week 31, 2013 for Linux Linaro ubuntu Raring.

by Botao Sun

Calendar Week 31 2013: Here is release critical test result summary for Linux Linaro ubuntu Raring image on following boards: 1) ARM Versatile Express A9; 2) Samsung Arndale; 3) TI Panda 4430; 4) TI Panda 4460; 1. ARM Versatile Express A9 + Linux Linaro Raring (Column AF): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFNmV… 2. Samsung Arndale + Linux Linaro Raring (Column Y): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdGZJS… 3. TI Panda 4430 + Linux Linaro Raring (Column AF): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… 4. TI Panda 4460 + Linux Linaro Raring (Column AF): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… For test result summary of Linaro 13.07 release (Calendar Week 30), please refer to attachment. Thank you. Best Regards Botao Sun

10 years, 8 months

[PATCH] uboot optimize memmove

by Andy Green

While studying the reason why kernel copy from NOR was so slow on our platform, I realized U-Boot is pulling it from 32-bit NOR in 8-bit chunks needlessly. bootm uses memmove() and that just takes the approach by default to move u8s around. This optimization prefers memcpy() implementation (done mostly in 32-bit reads and writes) if there's no overlap in source and dest, resulting in a huge speedup on our platform (480ms copy from 32-bit NOR ---> 140ms) Signed-off-by: Andy Green <andy.green(a)linaro.org> --- lib/string.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/lib/string.c b/lib/string.c index c3ad055..96d66e0 100644 --- a/lib/string.c +++ b/lib/string.c @@ -542,13 +542,21 @@ void * memmove(void * dest,const void *src,size_t count) if (src == dest) return dest; - if (dest <= src) { + if (dest < src) { + + if ((unsigned long)dest + count <= (unsigned long)src) + return memcpy(dest, src, count); + tmp = (char *) dest; s = (char *) src; while (count--) *tmp++ = *s++; } else { + + if ((unsigned long)src + count <= (unsigned long)dest) + return memcpy(dest, src, count); + tmp = (char *) dest + count; s = (char *) src + count; while (count--)

10 years, 8 months

Test Result Summary of Linaro openembedded 13.07 release candidate.

by Soumya Basak

Linaro openembedded 13.07 release(Calender week 30,2013): Here is the test result summary of Linaro openembedded 13.07 release candidate, [1] Linaro openembedded minimal images (column: AB) https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdDhwR… [2] Linaro openembedded Lamp images (column: AB) https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdDhwR… [3] Linaro openembedded leg-java-armv8 (column: E) https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdDhwR… Please look into the test result spreadsheets for all the test cases, and results details. Thanks & Regards Soumya Basak

10 years, 8 months

cts test results summary on Lava dashboard Linaro android TI panda builds

by Soumya Basak

Hi, Here is the cts test results summary on Lava dashboard Linaro android TI Panda builds; http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-and… cts test result bundle stream : http://validation.linaro.org/lava-server/dashboard/streams/private/team/lin… 2746/2942<http://validation.linaro.org/lava-server/dashboard/permalink/test-run/e30d3…> cts test cases are passed. cts-results.zip file is not available at the end of its run. Please look into the attached stdout.log for details. -- Thanks & Regards Soumya Basak.

10 years, 8 months

Test Result Summary of Linaro 13.07 Release for Linaro android Jellybean

by Soumya Basak

Linaro android Jellybean 13.07 Release (Calendar Week 30 2013): Here is the test result summary for Linaro android Jellybean 13.07 release builds on the following boards. [1] TI Panda 4460; [2] TI Panda 4430; [3] Samsung Arndale; [4] Galaxy Nexus; [5] ARM Versatile Express A9; synopsis: toolchain_version is updated to 4.8-2013.07-1 for all the builds. [1] TI Panda 4460 + Linaro android Jellybean 4.2.2 (column: AT) Test results spreadsheet: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AkxwyUNxNaAadGVWd… Please look into the test result spreadsheets for all the test cases, and result details. [2] TI Panda 4430 + Linaro android Jellybean 4.2.2 (column: AT) Test results spreadsheet: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AkxwyUNxNaAadGVWd… Please look into the test result spreadsheets for all the test cases, and results details. [3] Samsung Arndale + Linaro android Jellybean 4.2.2 (column: D) Test Results spreadsheet: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AuNOCeo15fRHdDFaR… [4] Galaxy Nexus + Linaro android Jellybean 4.2.2 (column: D) Test Results spreadsheet: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AuNOCeo15fRHdFhhe… [5] ARM Versatile Express A9 + Linaro android Jellybean 4.2.2 (column: AS) Test Results spreadsheet: https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AkxwyUNxNaAadExQd… Please look into the test result spreadsheets for all the test cases, and results details. Best Regards Soumya Basak

10 years, 8 months

Test Result Summary of Linaro 13.07 Release for Linux Linaro ubuntu Raring.

by Botao Sun

Linaro 13.07 Release (Calendar Week 30 2013): Here is test result summary for Linux Linaro ubuntu Raring image on following boards: 1) ARM Versatile Express A9; 2) Samsung Arndale; 3) TI Panda 4430; 4) TI Panda 4460; 1. ARM Versatile Express A9 + Linux Linaro Raring (Column AE): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFNmV… 2. Samsung Arndale + Linux Linaro Raring (Column X): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AgB-fT5LL31CdGZJS… 3. TI Panda 4430 + Linux Linaro Raring (Column AE): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… 4. TI Panda 4460 + Linux Linaro Raring (Column AE): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdEwwZ… For the test result of Linux Linaro ubuntu Raring ALIP image on ARM Versatile Express A9 board, please refer to this spreadsheet (Column E): https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AroPySpr4FnEdFNmV… For test summary of Calendar Week 27, please refer to attachment. Thank you. Best Regards Botao Sun

10 years, 8 months

backup/restore concept?

by Ryan

Hi, I have some doubts on backup and restore operation. From what i understand: We copy all registers values & addresses of all controllers in the SOC to the internal RAM or SRAM. before we put CPU to sleep? I want to know if we also copy the code segment into SRAM and what happens after wakeup. If so, where exactly we need to copy and how cpu jumps here after wakeup. or is there any other mechanism that is used. What executes first since DDR is in self-refresh. I use OMAP4 and this is my understanding. I could not understand much other than in OFF mode all the controller registers get copied to SRAM. Does anything else also gets copied too? or am i missing any basics here. Can anyone clarify my understanding. /Ryan

10 years, 8 months

Re: v.l.o Downtime

by Dave Pigott

Hi all, Just a reminder that this is happening tomorrow unless anyone shouts now. I've off lined fast models and all vexpress boards already because they take longer to clear the queue. Please shout now if this is a problem for you. Thanks Dave On 22 Jul 2013, at 14:02, Dave Pigott <dave.pigott(a)linaro.org> wrote: > Hi all, > > We need to start the switch over from launchpad single sign on, and to do this there will need to be a very small downtime of the LAVA server - it should be less than 5 minutes, maybe less than a minute if I do it right. > > I intend to do this on Wednesday at 11:00UTC (12:00BST). I would do it tomorrow, but I have a doctor's appointment in the morning. > > Thanks for your patience > > Dave

10 years, 8 months

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linaro-dev July 2013