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Date: Mon, 14 Mar 2016 17:18:34 +0000 From: Kieran Bingham <kieran.bingham@...aro.org> To: Jan Kiszka <jan.kiszka@...mens.com>, linux-kernel@...r.kernel.org Cc: lee.jones@...aro.org, peter.griffin@...aro.org, maxime.coquelin@...com Subject: Re: [PATCHv3 00/13] scripts/gdb: Linux awareness debug commands On 14/03/16 15:09, Jan Kiszka wrote: > On 2016-03-14 15:40, Kieran Bingham wrote: >> On 13/03/16 16:35, Jan Kiszka wrote: >>> On 2016-03-03 12:40, Kieran Bingham wrote: >>>> Hi Jan, >>>> >>>> V3 of the patchset respun. Now finally adding the lx-interrupts command >>>> after I resolved my issues with the Radix Tree parsing. >>>> >>>> This command only provides the interrupts that are available generically, >>>> and it seems that the /proc/interrupts function calls into arch specific >>>> layers to add extra information about arch specific interrupts. >>>> >>>> I'm not sure what to do about this yet - The values returned appear to be >>>> accurate - but it's just a subset of the information returned by proc. >>>> >>> >>> I didn't test this (due to the breakage in patch 10): Can you give >>> examples of what is missing, e.g. on ARM or x86? >> On ARM this is : >> >> (gdb) lx-interrupts >> CPU0 CPU1 >> 18: 587828 150187 >> 36: 66574 0 >> 41: 8 0 >> 42: 106 0 >> 43: 100 0 >> (gdb) c >> >> >> vs >> >> root@...ACookieMonster:~# cat /proc/interrupts >> CPU0 CPU1 >> 18: 588057 150274 GIC-0 27 Edge arch_timer >> 20: 0 0 GIC-0 34 Level timer >> 36: 66599 0 GIC-0 47 Level eth0 >> 39: 0 0 GIC-0 41 Level mmci-pl18x (cmd) >> 40: 0 0 GIC-0 42 Level mmci-pl18x (pio) >> 41: 8 0 GIC-0 44 Level kmi-pl050 >> 42: 106 0 GIC-0 45 Level kmi-pl050 >> 43: 112 0 GIC-0 37 Level uart-pl011 >> 49: 0 0 GIC-0 36 Level rtc-pl031 >> IPI0: 0 1 CPU wakeup interrupts >> IPI1: 0 0 Timer broadcast interrupts >> IPI2: 15867 281362 Rescheduling interrupts >> IPI3: 0 6 Function call interrupts >> IPI4: 0 0 CPU stop interrupts >> IPI5: 0 0 IRQ work interrupts >> IPI6: 0 0 completion interrupts >> Err: 0 >> >> So quite a substantial subset :( > > Indeed. Given this delta, I'm reluctant to include that command at this > point. Ok, understandable... I think the radix-tree lookup could be useful for people though. This is used across filesystems, and other places. Perhaps I should wrap this up into a gdb.Function rather than drop it? >>>> lx_thread_info_by_pid has been useful to me while looking at thread >>>> awareness, so I've included it into this patch set now. It makes finding >>>> internal thread information much more convenient. >>>> >>>> dentry_name has been moved to the utils module, as I am already using it >>>> in another command, so it's just not appropriate to be in proc.py >>>> >>>> The cpu_list mask iterators make calling for cpu in each_online_cpu() read >>>> nicely, and I've left the print_cpus() function in for now as a hidden >>>> helper. It can be used by calling: >>>> python linux.cpus.print_cpus() >>>> to check these generators, which I thought was quite nice - but I didn't >>>> know if it warranted a full command class for this. >>>> >>>> For convenience, this patch set submission can be found at >>>> http://git.linaro.org/people/kieran.bingham/linux.git gdb-scripts-2016-03-03-lkml-submission >>>> >>>> Patchset Changelog: >>>> v3: >>>> - Radix Tree parser introduced >>>> - cpu_list mask iterators added >>>> - lx-interrupts command implemented >>>> - dentry_name function moved to utils >>>> - lx-meminfo command PEP8 warnings fixed >>>> - lx_thread_info_by_pid introduced >>>> >>>> v2: >>>> - Reworked iterators with improved versions from Jeff Mahoney >>>> - Fixed !CONFIG_MODULES and !CONFIG_MMU support >>>> - Improvements on lx-meminfo >>>> - constants.py generated by Kbuild >>>> - IS_BUILTIN facility used to provide LX_CONFIG values >>>> >>>> v1: >>>> - Introduced lx-iomem, lx-ioports, lx-mounts, lx-meminfo >>>> >>>> Kieran Bingham (13): >>>> scripts/gdb: Provide linux constants >>>> scripts/gdb: Provide kernel list item generators >>>> scripts/gdb: Convert modules usage to lists functions >>>> scripts/gdb: Provide exception catching parser >>>> scripts/gdb: Support !CONFIG_MODULES gracefully >>>> scripts/gdb: Provide a dentry_name VFS path helper >>>> scripts/gdb: Add io resource readers >>>> scripts/gdb: Add mount point list command >>>> scripts/gdb: Add meminfo command >>>> scripts/gdb: Add cpu iterators >>>> scripts/gdb: Add a Radix Tree Parser >>>> scripts/gdb: Add interrupts command >>>> scripts/gdb: Add lx_thread_info_by_pid helper >>>> >>>> Kbuild | 10 + >>>> scripts/gdb/linux/Makefile | 12 +- >>>> scripts/gdb/linux/constants.py.in | 93 ++++++++ >>>> scripts/gdb/linux/cpus.py | 21 ++ >>>> scripts/gdb/linux/lists.py | 20 ++ >>>> scripts/gdb/linux/modules.py | 22 +- >>>> scripts/gdb/linux/proc.py | 449 ++++++++++++++++++++++++++++++++++++++ >>>> scripts/gdb/linux/radixtree.py | 74 +++++++ >>>> scripts/gdb/linux/tasks.py | 19 ++ >>>> scripts/gdb/linux/utils.py | 15 ++ >>>> scripts/gdb/vmlinux-gdb.py | 2 + >>>> 11 files changed, 724 insertions(+), 13 deletions(-) >>>> create mode 100644 scripts/gdb/linux/constants.py.in >>>> create mode 100644 scripts/gdb/linux/radixtree.py >>>> >>> >>> Besides the required rebase and, thus, the missing adjustment of the cpu >>> masks, I only have minor remarks. Maybe I will have more once I can play >>> with lx-interrupts ;). >> >> Ok - well it's fixed up locally, it's just a matter of prefixing the >> strings with two underscores. I should be able to get the updated >> patches out soon I hope. >> >>> However, I have a growing concern - I think we already discussed this >>> offline: Without automated tests, all these helpers may quickly fall >>> apart as the kernel changes. This should not block these patches, but >>> maybe you can think about some testing approaches before we have dozens >>> of helpers which can only be validated manually. >> >> Yes, indeed - and the breakage already seen between v4.4 and v4.5 only >> solidifies the need! >> >> I was able to chat to a few of the Linaro LAVA guys on this topic while >> I was at Connect, and they already have virtual kernels being boot >> tested. This should provide a good infrastructure to run some automated >> tests on. > > Sounds good! > >> >> So we have the infrastructure - we just need to get the tests written, >> and included. > > Yeah, "minor" detail. Isn't it ever :D > > Jan >
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