linaro-dev January 2012

linaro-dev@lists.linaro.org

125 participants
124 discussions

Transcript from our Kick-off meeting today.

by Tony Mansson

<pfefferz> all right so welcome to 12.02! the goal is to mkae snowball work great and origen iMX53 is semi blocked <bero> There's still stuff to try there <pfefferz> and panda gets a lot of attention <bero> But it would be really useful to get some more information <pfefferz> bero, lets hold off on iMX53 until we have more info <jackh> the three bugs assigned to me, i tried this afternoon, two of them still there <pfefferz> can you send the current issue set in? jackh, cool <jackh> the gallery one does not there <pfefferz> did you update the thrid? that's good feel free to list the build where you don't see it in the bug everyone we have a new team member jackh, aka Chenglie has joined us from IBM <jackh> it's Chengjie He <pfefferz> welcome Chengjie <bero> Welcome jackh <pabhishek> welcome jackh <pfefferz> right ;) <jackh> haha, just call me jacky for short... <bhoj2> welcom jackh :) <botao_sun> jackh: I will give you a brief later about compiling the code. <pfefferz> its great to have you on the Android team Chengjie He we'll do another welcome round on wednesday ;) <jackh> pls do it face to face, zach... haha, joking <pfefferz> :) so we're gonna focus on getting our tests all green its a big job as usuual :) we've had some good pickup by the member companies of our concerns so we shouldn't be as blocked as we were we also have connect abs and elc as a reminder all presentations for elc and abs have to be submitted a week before the event also for everyone doing a session please have a rough agenda listed something like here's where we are here's where we need to be I'm going to take a more passive role during other people's sessions this time :) any questions or comments? <mansson__> Prepare a "lightning talk" version of your session (5 min.) good to have. <pfefferz> good point mansson__ <pfefferz> the highest prio thing we have right now is the demo at connect most everyone is involoved in getting it to happen I suspect we'll be spending a bunch of time in the hacking sessions making it work I have to get a poster together so one more thing people arte really starting to use our builds 1. because they're easy to use 2. they work 3. they can talk to us on irc this means they're looking at our BPs to see how our work is progressing so that's all I had thanks for setting the meeting up Tony anyone have anything else? <mansson__> I think everything is pretty clear. We continue to make a lasting impression on human evolution. Making ARM Linux history. <pfefferz> exactly! <mansson__> 15 out of 50 talks at ELC are by Linaro people. <pfefferz> hehe not bad for a non-sponser seriously guys we're changing the world every little thing we get working has a giant impact okay <pfefferz> mansson__, would you send this transcript out to everyone? <mansson__> Yes. <pfefferz> thanks!

12 years, 2 months

[PATCH 2/3] vmalloc: use ZERO_SIZE_PTR / ZERO_OR_NULL_PTR

by Dmitry Antipov

- Fix vmap() to return ZERO_SIZE_PTR if 0 pages are requested; - fix __vmalloc_node_range() to return ZERO_SIZE_PTR if 0 bytes are requested; - fix __vunmap() to check passed pointer with ZERO_OR_NULL_PTR. Signed-off-by: Dmitry Antipov <dmitry.antipov(a)linaro.org> --- mm/vmalloc.c | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 86ce9a5..040a9cd 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1456,7 +1456,7 @@ static void __vunmap(const void *addr, int deallocate_pages) { struct vm_struct *area; - if (!addr) + if (unlikely(ZERO_OR_NULL_PTR(addr))) return; if ((PAGE_SIZE-1) & (unsigned long)addr) { @@ -1548,7 +1548,9 @@ void *vmap(struct page **pages, unsigned int count, might_sleep(); - if (count > totalram_pages) + if (unlikely(!count)) + return ZERO_SIZE_PTR; + if (unlikely(count > totalram_pages)) return NULL; area = get_vm_area_caller((count << PAGE_SHIFT), flags, @@ -1648,8 +1650,10 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align, void *addr; unsigned long real_size = size; + if (unlikely(!size)) + return ZERO_SIZE_PTR; size = PAGE_ALIGN(size); - if (!size || (size >> PAGE_SHIFT) > totalram_pages) + if (unlikely((size >> PAGE_SHIFT) > totalram_pages)) goto fail; area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNLIST, -- 1.7.7.6

12 years, 2 months

[PATCH] module: avoid call vmalloc if init size is zero

by Dmitry Antipov

For the architectures with it's own module_alloc(), if module init size is zero, avoiding module_alloc_update_bounds() and memset() no-op calls also eliminates warn_alloc_failed() zero-size warning in __vmalloc_node_range(). Signed-off-by: Dmitry Antipov <dmitry.antipov(a)linaro.org> --- kernel/module.c | 31 +++++++++++++++++-------------- 1 files changed, 17 insertions(+), 14 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index 2c93276..bbe1c5b 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2644,20 +2644,23 @@ static int move_module(struct module *mod, struct load_info *info) memset(ptr, 0, mod->core_size); mod->module_core = ptr; - ptr = module_alloc_update_bounds(mod->init_size); - /* - * The pointer to this block is stored in the module structure - * which is inside the block. This block doesn't need to be - * scanned as it contains data and code that will be freed - * after the module is initialized. - */ - kmemleak_ignore(ptr); - if (!ptr && mod->init_size) { - module_free(mod, mod->module_core); - return -ENOMEM; - } - memset(ptr, 0, mod->init_size); - mod->module_init = ptr; + if (mod->init_size) { + ptr = module_alloc_update_bounds(mod->init_size); + /* + * The pointer to this block is stored in the module structure + * which is inside the block. This block doesn't need to be + * scanned as it contains data and code that will be freed + * after the module is initialized. + */ + kmemleak_ignore(ptr); + if (!ptr) { + module_free(mod, mod->module_core); + return -ENOMEM; + } + memset(ptr, 0, mod->init_size); + mod->module_init = ptr; + } else + mod->module_init = NULL; /* Transfer each section which specifies SHF_ALLOC */ pr_debug("final section addresses:\n"); -- 1.7.7.5

12 years, 2 months

2012-01 Samsung kernel trees

by Vic Berdin

Hi everyone, Any chance the linux-linaro-*-lt-samsung kernel trees will get updated (soon)? By the way, is there a daily/nightly build source for these trees? I am eager to try them out. TIA - Vic

12 years, 2 months

Linaro Android build(s)

by hedwin

Gents, For some time now I am trying to build android from the linaro repos. Sofar I never succedded, it always resulted in build failures or it doesn't boot. So what did it do: I tried the 11.12 release staging and tracking. Got the last to build after switching to the 4.6 toolchain (nowhere documented) and added an include to the png.c file (it misted a math.h include, weird). It only didn't boot correctly because the kernel failed to initialise the GPU. So I switched to the 12.01 release. First used the "release-12.01" branch, build failure. Then switched to the "linaro_android_4.0.3" branch Used the same as mentioned in the build service build overview. Also used the same setup as mentioned in the build service. Build fails. Odd thing is that someone must be able to get a successfull build because ready available images do exist. So how did these get build? How do I get a good build? Cheers, Hedwin PS, below the build error in the 12.01 release: workCoreTests_install_verifier_good_intermediates/package.apk) com.google.doclava.apicheck.ApiParseException: Error parsing API at com.google.doclava.apicheck.XmlApiFile.parseApi(XmlApiFile.java:60) at com.google.doclava.apicheck.ApiCheck.parseApi(ApiCheck.java:152) at com.google.doclava.apicheck.ApiCheck.convertToXml(ApiCheck.java:234) at com.google.doclava.apicheck.ApiCheck.main(ApiCheck.java:64) Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1414) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1039) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.google.doclava.apicheck.XmlApiFile.parseApi(XmlApiFile.java:54) ... 3 more Error parsing API: frameworks/base/api/current.txt make: *** [out/target/common/obj/APPS/SignatureTest_intermediates/api.xml] Error 1 make: *** Waiting for unfinished jobs....

12 years, 3 months

[Activity] Power Management WG Weekly Status report for week ending 2012-01-27

by Mounir Bsaibes

Enclosed please find the link to the Weekly Status report & meeting minutes for the Power Management working group for the week ending 2012-01-27 == Weekly Status Report == https://wiki.linaro.org/WorkingGroups/PowerManagement/Status/2012-01-26 == Meeting Minutes == https://wiki.linaro.org/WorkingGroups/PowerManagement/Meetings/2012-01-25 == Summary == (For details, see the Weekly Status Report and Meeting Minutes ) * Linaro Connect sessions planning & setup * http://summit.ubuntu.com/lcq1-12/track/linaro-power/ * Common Clock * Working on changing the code based on feedback from v2-v4 submission, quite a bit of code change for v5. * About 50% done on converting OMAP4 to use the new code. * Thermal Management * Working on fine tuning of cpufreq/cpuhotplug based cooling devices to be now instance based (needed for multi core systems) * Submitted V4 of imx thermal driver * hrtimer * Continue working on implementing core high-res timers feature to return time spent in usleep_range() * cpuidle * Submitted at91 standby functions * Implemented cpuidle WFI state for ux500 based on common framework * Working on dynamic init function for the common cpuidle code will add to the next version * Sched_mc * Preparing for the scheduler mini-summit at Connect * Taking measurement on the new sched_mc patch before submitting it, will try to summit the patch before connect and cc the attendees of the mini-summit * Issue * Team is not getting fast enough feedback on their patches. Best regards, Mounir -- Mounir Bsaibes Project Manager Follow Linaro.org: facebook.com/pages/Linaro/155974581091106 http://twitter.com/#!/linaroorg http://www.linaro.org/linaro-blog <http://www.linaro.org/linaro-blog>

12 years, 3 months

[Activity] Kernel WG Weekly Status report for week ending 2012-01-27

by Mounir Bsaibes

Enclosed please find the link to the Weekly Status & Individual Activity reports for the kernel working group for the week ending 2012-01-27 == Weekly Status Report == https://wiki.linaro.org/WorkingGroups/Kernel/Status/2012-01-26 <https://wiki.linaro.org/WorkingGroups/Kernel/Status/2012-01-12> == Individual Activity Report == https://wiki.linaro.org/WorkingGroups/Kernel/ActivityReports/2012-01-20 <https://wiki.linaro.org/WorkingGroups/Kernel/ActivityReports/2012-01-06> == Summary == (For more details, please see the Status and the Individual Activity reports above) * Released linux-linaro-3.2-2021.01-0 * http://launchpad.net/linux-linaro/3.2/3.2-2012.01/+download/linux-linaro-3.… * Connect sessions planning * http://summit.ubuntu.com/lcq1-12/track/linaro-kernel * Pinctrl * Created a new pin control patch (v2), will make a third (v3) for per-device named states. * Tony Lindgren, OMAP maintainer, attended the pinctrl meeting * See the various topics / issues discussed at: https://wiki.linaro.org/WorkingGroups/Kernel/PinctrlMeetings/2012-01-24 * Android upstreaming * evdev timestamp patch was merged in maintainer's tree and queued for 3.4 * Worked range-tree implementation for the fadvise volatile code. Got insert/delete/lookup working & also added splay-tree style self-balancing. * Started looking into interactive cpufreq governor, forward-ported it onto latest kernels. * kconfig * merge_config.sh script that handles config fragments was merged into 3.3 * Storage * Prepared a patch for Context ID for Samsung eMMC. * big.LITTLE switcher * Identifying the needed code to support the b.L switcher from the Linux kernel environment. * Single Kernel * Rebased patch series removing arch_idle() and most instances of mach/system.h from the source tree onto v3.3-rc1. Best regards, Mounir Bsaibes Project Manager Follow Linaro.org: facebook.com/pages/Linaro/155974581091106 http://twitter.com/#!/linaroorg http://www.linaro.org/linaro-blog <http://www.linaro.org/linaro-blog>

12 years, 3 months

Linaro kernel tree for A15 for daily builds

by Zygmunt Krynicki

HI. I'm building a LAVA service for running fast models. Quite soon (*) we'll be ready to open an alpha access. Right now you will need to bring your own root filesystem and kernel image to use it. With that in mind I wanted to start a discussion about the state of A15 support in Linaro kernel(s). I need to understand two things: 1) Are we ready to do automatic builds for A15 kernels? 2) If so, which configs and trees should we consider Thanks Zygmunt Krynicki

12 years, 3 months

[PATCH] hrtimers: move default_timer_slack_ns to system-wide sysctl

by Dmitry Antipov

- moving default_timer_slack_ns from per-task field to global variable controlled via sysctl() in [0..1000000] range (usecs) provides some more system-wide control beyond per-task prctl(); - task_time_slack() should be used to get default timer slack if no special requirements exists. Signed-off-by: Dmitry Antipov <dmitry.antipov(a)linaro.org> --- include/linux/hrtimer.h | 1 + include/linux/sched.h | 11 ++++++++--- kernel/fork.c | 3 --- kernel/futex.c | 4 ++-- kernel/hrtimer.c | 10 +++++++--- kernel/sys.c | 3 ++- kernel/sysctl.c | 10 ++++++++++ 7 files changed, 30 insertions(+), 12 deletions(-) diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index fd0dc30..855d45e 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -323,6 +323,7 @@ extern ktime_t ktime_get_monotonic_offset(void); DECLARE_PER_CPU(struct tick_device, tick_cpu_device); +extern int default_timer_slack_ns; /* Exported timer functions: */ diff --git a/include/linux/sched.h b/include/linux/sched.h index 2234985..4f475aa 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1551,11 +1551,11 @@ struct task_struct { struct latency_record latency_record[LT_SAVECOUNT]; #endif /* - * time slack values; these are used to round up poll() and - * select() etc timeout values. These are in nanoseconds. + * High-resolution timer slack value, in nanoseconds. + * Used to round up poll()/select(), nanosleep, futex + * waiting, etc. timeout values for non-realtime tasks. */ unsigned long timer_slack_ns; - unsigned long default_timer_slack_ns; struct list_head *scm_work_list; #ifdef CONFIG_FUNCTION_GRAPH_TRACER @@ -2622,6 +2622,11 @@ static inline int spin_needbreak(spinlock_t *lock) #endif } +static inline unsigned long task_timer_slack(struct task_struct *tsk) +{ + return rt_task(tsk) ? 0 : tsk->timer_slack_ns; +} + /* * Thread group CPU time accounting. */ diff --git a/kernel/fork.c b/kernel/fork.c index 051f090..b0e8f63 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1144,9 +1144,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, #if defined(SPLIT_RSS_COUNTING) memset(&p->rss_stat, 0, sizeof(p->rss_stat)); #endif - - p->default_timer_slack_ns = current->timer_slack_ns; - task_io_accounting_init(&p->ioac); acct_clear_integrals(p); diff --git a/kernel/futex.c b/kernel/futex.c index 1614be2..a0d302d 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -1887,7 +1887,7 @@ static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, HRTIMER_MODE_ABS); hrtimer_init_sleeper(to, current); hrtimer_set_expires_range_ns(&to->timer, *abs_time, - current->timer_slack_ns); + task_timer_slack(current)); } retry: @@ -2281,7 +2281,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, HRTIMER_MODE_ABS); hrtimer_init_sleeper(to, current); hrtimer_set_expires_range_ns(&to->timer, *abs_time, - current->timer_slack_ns); + task_timer_slack(current)); } /* diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index ae34bf5..0704559 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -51,6 +51,12 @@ #include <trace/events/timer.h> /* + * Default hrtimer slack value, in nanoseconds. May be + * changed via sysctl within [0..1000000] range. + */ +int default_timer_slack_ns = 50000; + +/* * The timer bases: * * There are more clockids then hrtimer bases. Thus, we index @@ -1564,9 +1570,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, int ret = 0; unsigned long slack; - slack = current->timer_slack_ns; - if (rt_task(current)) - slack = 0; + slack = task_timer_slack(current); hrtimer_init_on_stack(&t.timer, clockid, mode); hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack); diff --git a/kernel/sys.c b/kernel/sys.c index 4070153..db36543 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -22,6 +22,7 @@ #include <linux/device.h> #include <linux/key.h> #include <linux/times.h> +#include <linux/hrtimer.h> #include <linux/posix-timers.h> #include <linux/security.h> #include <linux/dcookies.h> @@ -1919,7 +1920,7 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, case PR_SET_TIMERSLACK: if (arg2 <= 0) current->timer_slack_ns = - current->default_timer_slack_ns; + default_timer_slack_ns; else current->timer_slack_ns = arg2; error = 0; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index f487f25..c9a731b 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -122,6 +122,7 @@ static int __maybe_unused two = 2; static int __maybe_unused three = 3; static unsigned long one_ul = 1; static int one_hundred = 100; +static int million = 1000000; #ifdef CONFIG_PRINTK static int ten_thousand = 10000; #endif @@ -1004,6 +1005,15 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif + { + .procname = "timer_slack", + .data = &default_timer_slack_ns, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &million, + }, { } }; -- 1.7.7.5

12 years, 3 months

Sources for 11.11 kernel release

by Chris Lalancette

(I'm aware that there is a thread on linaro-dev discussing this exact topic; this is a request for specific information, so I decided to start a new thread) Hello, As has been pointed out elsewhere, it is very difficult to find the exact git tree that corresponds to a kernel release. Currently the problem I am having is that the 11.11 linaro kernel release (linux-linaro-lt-omap_3.1.0-1402.5~oneiric1) works well on my new board, but later kernels do not. While I can download the kernel tarball for 3.1.0-1402.5 from launchpad, I would much prefer to use the git tree that it was produced from. Can anybody tell me exactly which git tree was used to create that kernel, and which tag/branch I should be looking at? Thanks, -- Chris Lalancette

12 years, 3 months

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linaro-dev January 2012