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On Mon, 17 Feb 2020 at 10:16, zied guermazi <guermazi_zied(a)yahoo.com> wrote:
>
> Hi Mike, hi Matthieu,
>
> I was too rapid to press the send button, sorry for the inconvienience.
> and yes, it works. I published the source code in github (https://github.com/gzied/binutils-gdb/tree/gdb_arm_coresight) ,as well as a mail in linaro mailing list (https://lists.linaro.org/pipermail/coresight/2020-February/003676.html).
Unfortunately you didn't publish your work in "PATCH" format and as
such it can't be reviewed.
> Eventhough there is still an effort needed to stabilize it for armv7, and test it for armv8, I consider this as a breakthough that we can build on the top of it.
> I will be visiting Embedded world exhibition between 25th and 27th of February in Nuremberg, Germany. are you planning to be there too. I am looking forwards to meet you there if possible to discuss possibilities of further development and integration in the main stream.
I won't be in Nuremberg next week and I'm pretty sure Mike won't be
there either. Other people on the lists might be around and
interested in meeting with you. Mike and I will be attending Linaro
Connect in Budapest between the 23rd and 27th of March. The Linaro
toolchain group will also be there so it might be the perfect
opportunity to sit down for an hour or so and have a chat.
A good day to you,
Mathieu
>
> Kind Regards
> Zied Guermazi
>
>
>
>
>
> On Monday, February 17, 2020, 06:08:26 PM GMT+1, zied guermazi <guermazi_zied(a)yahoo.com> wrote:
>
>
> Hi Mike, hi Matthieu
> it works!
>
>
>
> On Monday, December 16, 2019, 11:20:20 PM GMT+1, zied guermazi <guermazi_zied(a)yahoo.com> wrote:
>
>
> hi Mike, hi Mathieu
> last few weeks I was able to spend some time on implementing this feature, and I want to share the status with you and get your recommendation on organizational and technical level.
> so far I was able to use perf events to configure the drivers for etm and collect the traces. the code was tested successfully on an STM32MP157A discovery kit (arm v7).
> I would like to push this on git, first for review and second for integration and creating traction . Do you think it is ok to push it in this status (feature partially achieved) ? is linaro gdb git the correct one? who is the maintainer of this part of gdb? I do not have an ARMv8 platform to test. who can support here?
>
> during the implementation few technical question raised:
> - etm tracing collection requires selecting a trace sink. and I have two alternatives: either extending the "record btrace etm" command (used to start tracing) with a sink as an argument or extending the command "set record btrace" (general configuration of tracing) with etm sink sub-command? (I have hard-coded it currently to be able to progress)
> - currently I am hardcoding the path "/sys/bus/event_source/devices/cs_etm/" as the default etm source, is this guaranteed to be unique? can we have a system with many etm sources enumerated in the sysfs.
>
> for parsing the traces I will need some configuration parameters like the content of registers ETMCR, ETMIDR, ETMCCER, ETMTRACEIDR. if my understanding of the implementation of perf is correct, it is collecting them from the sysfs files located in /sys/bus/event_source/devices/cs_etm/cpu0/mgmt/. which are global for the system. my question is what will happen if two process are requesting tracing at the same time? how to differentiate between traces going to one session from the second one? is it possible to get the parameters of a given session by some kind of ioctl request to the file descriptor we get out of sys_perf_open call?
>
> I will publish those queries in the linaro coresight and gdb forums, I wanted first to align with you especially on the organizational issues, before going to a bigger round.
>
> Thanks for your support
> Zied Guermazi
>
>
Hi all,
This regarding to the plan to build coresight drivers as Kernel module.
Currently, it doesn't support that. I noticed there's some patch to add
the ability to build as module but that patch doesn't end to be merged.
I'd like to know whether anyone is working on this or has plan for this.
I'm interesting in this since there's some trend on mobile device
especially Android device that all drivers should be built as Kernel
modules. Coresight drivers are important for mobile device to debug
SW/HW issues.
Thanks,
Tingwei
This patch series is to address issues for synthesizing instruction
samples, especially when the instruction sample period is small enough,
the current logic cannot synthesize multiple instruction samples within
one instruction range packet.
Patch 0001 is to swap packets for instruction samples, so this allow
option '--itrace=iNNN' can work well.
Patch 0002 avoids to reset the last branches for every instruction
sample; if reset the last branches for every time generating sample, the
later samples in the same range packet cannot use the last branches
anymore.
Patch 0003 is the fixing for handling different instruction periods,
especially for small sample period.
Patch 0004 is an optimization for copying last branches; it only copies
last branches once if the instruction samples share the same last
branches.
Patch 0005 is a minor fix for unsigned variable comparison to zero.
This patch set has been rebased on the latest perf/core branch; and
verified on Juno board with below commands:
# perf script --itrace=i2
# perf script --itrace=i2il16
# perf inject --itrace=i2il16 -i perf.data -o perf.data.new
# perf inject --itrace=i100il16 -i perf.data -o perf.data.new
Changes from v3:
* Refactored patch 0001 with new function cs_etm__packet_swap() (Mike);
* Refined instruction sample generation flow with single while loop,
which completely uses Mike's suggestions (Mike);
* Added Mike's review tags for patch 01/02/04/05.
Changes from v2:
* Added patch 0001 which is to fix swapping packets for instruction
samples;
* Refined minor commit logs and comments;
* Rebased on the latest perf/core branch.
Changes from v1:
* Rebased patch set on perf/core branch with latest commit 9fec3cd5fa4a
("perf map: Check if the map still has some refcounts on exit").
Leo Yan (5):
perf cs-etm: Swap packets for instruction samples
perf cs-etm: Continuously record last branch
perf cs-etm: Correct synthesizing instruction samples
perf cs-etm: Optimize copying last branches
perf cs-etm: Fix unsigned variable comparison to zero
tools/perf/util/cs-etm.c | 157 +++++++++++++++++++++++++++------------
1 file changed, 111 insertions(+), 46 deletions(-)
--
2.17.1
i
Hi Zied,
As requested before, always add the CS mailing list when interacting
with us. There is a fair amount of people on there that would surely
be interested in this work. I also CC'd the linaro-toolchain group
since some of the content below is related to what they do.
On Mon, 17 Feb 2020 at 10:08, zied guermazi <guermazi_zied(a)yahoo.com> wrote:
>
> Hi Mike, hi Matthieu
> it works!
>
>
>
> On Monday, December 16, 2019, 11:20:20 PM GMT+1, zied guermazi <guermazi_zied(a)yahoo.com> wrote:
>
>
> hi Mike, hi Mathieu
> last few weeks I was able to spend some time on implementing this feature, and I want to share the status with you and get your recommendation on organizational and technical level.
> so far I was able to use perf events to configure the drivers for etm and collect the traces. the code was tested successfully on an STM32MP157A discovery kit (arm v7).
> I would like to push this on git, first for review and second for integration and creating traction . Do you think it is ok to push it in this status (feature partially achieved) ? is linaro gdb git the correct one? who is the maintainer of this part of gdb? I do not have an ARMv8 platform to test. who can support here?
I will address your questions one by one:
Q: Do you think it is ok to push it in this status (feature partially
achieved) ?
A: That depends on how advanced things are. If it is stable (i.e it
does something) and can be used as a starting point for other people
to work on, then there is probably value in publishing your work.
Q: is linaro gdb git the correct one?
A: I see from your other email that you've already published your work.
Q: who is the maintainer of this part of gdb?
A: I'm sure the GDB project has documentation and a well defined
process that would identify who you should submit your code to.
Q: I do not have an ARMv8 platform to test. who can support here?
A: No doubt you'd get a lot more interest if you were working on V8.
I suggest purchasing a dragonboard 410c - they are super cheap, well
supported and one of our CS reference platforms. I think we talked
about that before...
>
> during the implementation few technical question raised:
> - etm tracing collection requires selecting a trace sink. and I have two alternatives: either extending the "record btrace etm" command (used to start tracing) with a sink as an argument or extending the command "set record btrace" (general configuration of tracing) with etm sink sub-command? (I have hard-coded it currently to be able to progress)
I would assume this "set record btrace" command has an effect on the
current session only. If so I would go for the latter option.
> - currently I am hardcoding the path "/sys/bus/event_source/devices/cs_etm/" as the default etm source, is this guaranteed to be unique? can we have a system with many etm sources enumerated in the sysfs.
>
I am very confused by this question. Yes, the path
"/sys/bus/event_source/devices/cs_etm/" is guaranteed to be unique but
it is by no means a "default source". Is is simply a directory used
by the perf tools to have more details on the CS specifics for the
running platform. Nowadays it is fair to assume there is one ETM perf
CPU, all enumerated under sysfs. Also keep in mind that processes are
being moved around by the scheduler and as such, a specific source
can't be hard coded.
> for parsing the traces I will need some configuration parameters like the content of registers ETMCR, ETMIDR, ETMCCER, ETMTRACEIDR. if my understanding of the implementation of perf is correct, it is collecting them from the sysfs files located in /sys/bus/event_source/devices/cs_etm/cpu0/mgmt/. which are global for the system. my question is what will happen if two process are requesting tracing at the same time? how to differentiate between traces going to one session from the second one? is it possible to get the parameters of a given session by some kind of ioctl request to the file descriptor we get out of sys_perf_open call?
Configuration of the tracers does indeed need to be considered. At
this time we assume all the tracers in an implementation are similar,
hence using ".../cpu0/mgmt". The information gathered from there is
related to the static configuration of the tracers. Per session
dynamic configuration is collected from the perf tools command line
and communicated to the perf infrastructure for later interpretation
by the decoding code when instantiating a decoder from the openCSD
library. Since the current framework handles only N:1 source/sink
configuration, there can only be one trace session using a sink.
There is currently no way to extract trace session configuration other
than the user space perf tools mechanic.
>
> I will publish those queries in the linaro coresight and gdb forums, I wanted first to align with you especially on the organizational issues, before going to a bigger round.
>
> Thanks for your support
> Zied Guermazi
>
>
This patch series adds support for thread stack and callchain; this is a
sequential version from v3 [1] but reorgnized the patches, some changes
have been refactored into the instruction sample fix patch set [2], and
this patch set is only to focus on thread stack and callchain support.
Patch 01 is to refactor the instruction size calculation; this patch is
used by patch 02.
Patch 02 is to add thread stack support, after applying this patch the
option '-F,+callindent' can be used by perf script tool; patch 03 is to
add branch filter thus the Perf tool can display branch samples only
for function calls and returns after enable the call indentation or call
chain related options.
Patch 04 is to synthesize call chain for the instruction samples.
Patch 05 allows the instruction sample can be handled synchronously with
the thread stack, thus it fixes an error for the callchain generation.
This patch set has been tested on Juno-r2 after applied on perf/core
branch with latest commit 85fc95d75970 ("perf maps: Add missing unlock
to maps__insert() error case"), and this patch set is dependent on the
instruction sample fix patch set [2].
Test for option '-F,+callindent':
Before:
# perf script -F,+callindent
main 840 1 branches: main ffffa2319d20 __libc_start_main+0xe0 (/usr/lib/aarch64-linux-gnu/libc-2.28.so)
main 840 1 branches: aaaab94cb7d0 main+0xc (/root/coresight_test/main)
main 840 1 branches: aaaab94cb808 main+0x44 (/root/coresight_test/main)
main 840 1 branches: lib_loop_test@plt aaaab94cb7dc main+0x18 (/root/coresight_test/main)
main 840 1 branches: lib_loop_test@plt aaaab94cb67c lib_loop_test@plt+0xc (/root/coresight_test/main)
main 840 1 branches: _init aaaab94cb650 _init+0x30 (/root/coresight_test/main)
main 840 1 branches: _dl_fixup ffffa24a5b44 _dl_runtime_resolve+0x40 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: _dl_lookup_symbol_x ffffa24a0070 _dl_fixup+0xb8 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
[...]
After:
# perf script -F,+callindent
main 840 1 branches: main ffffa2319d20 __libc_start_main+0xe0 (/usr/lib/aarch64-linux-gnu/libc-2.28.so)
main 840 1 branches: lib_loop_test@plt aaaab94cb7dc main+0x18 (/root/coresight_test/main)
main 840 1 branches: _dl_fixup ffffa24a5b44 _dl_runtime_resolve+0x40 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: _dl_lookup_symbol_x ffffa24a0070 _dl_fixup+0xb8 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: do_lookup_x ffffa249c4a4 _dl_lookup_symbol_x+0x104 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: check_match ffffa249bbf8 do_lookup_x+0x238 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa249b890 check_match+0x70 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: printf@plt aaaab94cb7f0 main+0x2c (/root/coresight_test/main)
main 840 1 branches: _dl_fixup ffffa24a5b44 _dl_runtime_resolve+0x40 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: _dl_lookup_symbol_x ffffa24a0070 _dl_fixup+0xb8 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: do_lookup_x ffffa249c4a4 _dl_lookup_symbol_x+0x104 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: _dl_name_match_p ffffa249baf8 do_lookup_x+0x138 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa24a17e8 _dl_name_match_p+0x18 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa24a180c _dl_name_match_p+0x3c (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: _dl_name_match_p ffffa249baf8 do_lookup_x+0x138 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa24a17e8 _dl_name_match_p+0x18 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa24a180c _dl_name_match_p+0x3c (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: check_match ffffa249bbf8 do_lookup_x+0x238 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa249b890 check_match+0x70 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
main 840 1 branches: strcmp ffffa249b968 check_match+0x148 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
[...]
Test for option '--itrace=g':
Before:
# perf script --itrace=g16l64i100
main 840 100 instructions: ffff8000102642c0 event_sched_in.isra.119+0x140 ([kernel.kallsyms])
main 840 100 instructions: ffff800010264794 flexible_sched_in+0xe4 ([kernel.kallsyms])
main 840 100 instructions: ffff800010263024 perf_pmu_disable+0x4 ([kernel.kallsyms])
main 840 100 instructions: ffff80001026b0e0 perf_swevent_add+0xb8 ([kernel.kallsyms])
main 840 100 instructions: ffff80001025b504 calc_timer_values+0x34 ([kernel.kallsyms])
main 840 100 instructions: ffff80001019bd24 clocks_calc_mult_shift+0x3c ([kernel.kallsyms])
main 840 100 instructions: ffff80001026556c perf_event_update_userpage+0xec ([kernel.kallsyms])
main 840 100 instructions: ffff80001025c5e4 visit_groups_merge+0x194 ([kernel.kallsyms])
[...]
After:
# perf script --itrace=g16l64i100
main 840 100 instructions:
ffff800010264794 flexible_sched_in+0xe4 ([kernel.kallsyms])
ffff80001025c57c visit_groups_merge+0x12c ([kernel.kallsyms])
main 840 100 instructions:
ffff800010263024 perf_pmu_disable+0x4 ([kernel.kallsyms])
ffff8000102641f0 event_sched_in.isra.119+0x70 ([kernel.kallsyms])
ffff8000102643d8 group_sched_in+0x60 ([kernel.kallsyms])
ffff8000102647b0 flexible_sched_in+0x100 ([kernel.kallsyms])
ffff80001025c57c visit_groups_merge+0x12c ([kernel.kallsyms])
main 840 100 instructions:
ffff80001026b0e0 perf_swevent_add+0xb8 ([kernel.kallsyms])
ffff80001026423c event_sched_in.isra.119+0xbc ([kernel.kallsyms])
ffff8000102643d8 group_sched_in+0x60 ([kernel.kallsyms])
ffff8000102647b0 flexible_sched_in+0x100 ([kernel.kallsyms])
ffff80001025c57c visit_groups_merge+0x12c ([kernel.kallsyms])
[...]
Changes from v3:
* Splitted out separate patch set for instruction samples fixing.
* Rebased on latest perf/core branch.
Changes from v2:
* Added patch 01 to fix the unsigned variable comparison to zero
(Suzuki).
* Refined commit logs.
Changes from v1:
* Added comments for task thread handling (Mathieu).
* Split patch 02 into two patches, one is for support thread stack and
another is for callchain support (Mathieu).
* Added a new patch to support branch filter.
[1] https://lkml.org/lkml/2019/10/5/51
[2] https://lkml.org/lkml/2020/2/2/228
Leo Yan (5):
perf cs-etm: Refactor instruction size handling
perf cs-etm: Support thread stack
perf cs-etm: Support branch filter
perf cs-etm: Support callchain for instruction sample
perf cs-etm: Synchronize instruction sample with the thread stack
tools/perf/util/cs-etm.c | 145 ++++++++++++++++++++++++++++++++-------
1 file changed, 121 insertions(+), 24 deletions(-)
--
2.17.1
Let's restart this work [1], this patch set is the dependency for
support callchain for Arm CoreSight, which will be sent out in another
patch set.
This patch series is to address issues for synthesizing instruction
samples, especially when the instruction sample period is small enough,
the current logic cannot synthesize multiple instruction samples within
one instruction range packet.
Patch 0001 is to swap packets for instruction samples, so this allow
option '--itrace=iNNN' can work well.
Patch 0002 avoids to reset the last branches for every instruction
sample; if reset the last branches for every time generating sample, the
later samples in the same range packet cannot use the last branches
anymore.
Patch 0003 is the fixing for handling different instruction periods,
especially for small sample period.
Patch 0004 is an optimization for copying last branches; it only copies
last branches once if the instruction samples share the same last
branches.
Patch 0005 is a minor fix for unsigned variable comparison to zero.
This patch set has been rebased on the latest perf/core branch; and
verified on Juno board with below commands:
# perf script --itrace=i2
# perf script --itrace=i2il16
# perf inject --itrace=i2il16 -i perf.data -o perf.data.new
# perf inject --itrace=i100il16 -i perf.data -o perf.data.new
Changes from v2:
* Added patch 0001 which is to fix swapping packets for instruction
samples;
* Refined minor commit logs and comments;
* Rebased on the latest perf/core branch.
Changes from v1:
* Rebased patch set on perf/core branch with latest commit 9fec3cd5fa4a
("perf map: Check if the map still has some refcounts on exit").
[1] https://patchwork.kernel.org/cover/11222259/
Leo Yan (5):
perf cs-etm: Swap packets for instruction samples
perf cs-etm: Continuously record last branch
perf cs-etm: Correct synthesizing instruction samples
perf cs-etm: Optimize copying last branches
perf cs-etm: Fix unsigned variable comparison to zero
tools/perf/util/cs-etm.c | 142 ++++++++++++++++++++++++++++++++-------
1 file changed, 118 insertions(+), 24 deletions(-)
--
2.17.1
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