[lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[GOLLAMUDI MADHAN MOHAN via lttng-dev]

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Dear Sir/Madam,
                           I am Madhan , working as an embedded engineer in
5GTB. I am using lttng in petalinux 2019.2(kernel 4.19) .And getting a call
Trace error. Refer the below log for more details.


root@xilinx-zcu111-2019_2:~# lttng create
Spawning a session daemon
[  163.902282] lttng_kretprobes: loading out-of-tree module taints kernel.
[  163.987461] Unable to handle kernel paging request at virtual address
00000000000010c0
[  163.995379] Mem abort info:
[  163.998179]   ESR = 0x96000005
[  164.001233]   Exception class = DABT (current EL), IL = 32 bits
[  164.007149]   SET = 0, FnV = 0
[  164.010203]   EA = 0, S1PTW = 0
[  164.013333] Data abort info:
[  164.016218]   ISV = 0, ISS = 0x00000005
[  164.020054]   CM = 0, WnR = 0
[  164.023028] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000df6dd54e
[  164.029646] [00000000000010c0] pgd=0000000000000000, pud=0000000000000000
[  164.036447] Internal error: Oops: 96000005 [#1] SMP
[  164.041318] Modules linked in: lttng_tracer(O+) lttng_statedump(O)
lttng_ftrace(O) lttng_kprobes(O) lttng_clock(O) lttng_lib_ring_buffer(O)
lttng_kretprobes(O) uio_pdrv_genirq
[  164.056963] CPU: 1 PID: 4955 Comm: modprobe Tainted: G           O
 4.19.0-xilinx-v2019.2 #1
[  164.065734] Hardware name: ZynqMP ZCU111 RevA (DT)
[  164.070510] pstate: 60000005 (nZCv daif -PAN -UAO)
[  164.075429] pc : lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
[  164.081767] lr : lttng_tracepoint_notify+0x14c/0x228 [lttng_tracer]
[  164.088016] sp : ffffff8011613a40
[  164.091314] x29: ffffff8011613a40 x28: ffffff801163f000
[  164.096618] x27: 0000000000000100 x26: ffffff800813c958
[  164.101921] x25: ffffff8000e22758 x24: 0000000000000000
[  164.107225] x23: 00000000000010c0 x22: ffffff8000e42ed8
[  164.112528] x21: ffffffc87accc400 x20: ffffff8000e42ef8
[  164.117832] x19: 0000000000000001 x18: 0000000000000000
[  164.123135] x17: 0000000000000000 x16: 0000000000000000
[  164.128439] x15: ffffffffffffffff x14: 0000000000000000
[  164.133742] x13: 0000000000000000 x12: 0000000000000000
[  164.139046] x11: 0000000000000001 x10: 0101010101010101
[  164.144349] x9 : 6d64686b625e6f38 x8 : 706d75645f6c6f63
[  164.149653] x7 : 6f746f72705f7039 x6 : ffffffc8778d5ec1
[  164.154957] x5 : ffffff8009458000 x4 : 0000000000000000
[  164.160260] x3 : ffffff8000db77a0 x2 : ffffffc87828a380
[  164.165563] x1 : 0000000000000007 x0 : ffffff8000d13048
[  164.170869] Process modprobe (pid: 4955, stack limit =
0x00000000e6162018)
[  164.177725] Call trace:
[  164.180235]  lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
[  164.186148]  register_tracepoint_module_notifier+0x6c/0x98
[  164.191709]  lttng_tracepoint_init+0x54/0xc80 [lttng_tracer]
[  164.197438]  lttng_events_init+0x4c/0x1e0 [lttng_tracer]
[  164.202734]  do_one_initcall+0x68/0x1ec
[  164.206562]  do_init_module+0x60/0x1f0
[  164.210302]  load_module+0x1ca0/0x2270
[  164.214035]  __se_sys_finit_module+0xc0/0xd0
[  164.218288]  __arm64_sys_finit_module+0x24/0x30
[  164.222802]  el0_svc_common+0x98/0x100
[  164.226543]  el0_svc_handler+0x74/0x90
[  164.230275]  el0_svc+0x8/0xc
[  164.233142] Code: 6b18003f 54fffc49 f9415c00 b8b8d817 (f94002f3)
[  164.239226] ---[ end trace c1cc2d1f9d55794a ]---
[  195.613567] lttng_ring_buffer_client_overwrite: gave up waiting for init
of module lttng_tracer.
[  195.622371] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_transport_unregister (err -16)
^C
root@xilinx-zcu111-2019_2:~# uname -a
Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26
UTC 2022 aarch64 GNU/Linux
root@xilinx-zcu111-2019_2:~# uname -a
Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26
UTC 2022 aarch64 GNU/Linux
root@xilinx-zcu111-2019_2:~# [  226.333565]
lttng_ring_buffer_client_overwrite: gave up waiting for init of module
lttng_tracer.
[  226.342368] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_last_tsc (err -16)
[  257.053564] lttng_ring_buffer_client_overwrite: gave up waiting for init
of module lttng_tracer.
[  257.062358] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_transport_register (err -16)
[  287.773562] lttng_ring_buffer_client_overwrite: gave up waiting for init
of module lttng_tracer.
[  287.782356] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_transport_unregister (err -16)
[  318.493567] lttng_ring_buffer_client_overwrite: gave up waiting for init
of module lttng_tracer.
[  318.502364] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_last_tsc (err -16)
[  349.213564] lttng_ring_buffer_client_overwrite: gave up waiting for init
of module lttng_tracer.
[  349.222363] lttng_ring_buffer_client_overwrite: Unknown symbol
lttng_transport_register (err -16)


Thank You
with regards
G Madhan Mohan

-- 


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Re: [lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[Mathieu Desnoyers via lttng-dev]

----- On Mar 15, 2022, at 2:48 AM, lttng-dev lttng-dev@lists.lttng.org wrote:

> Dear Sir/Madam,
> I am Madhan , working as an embedded engineer in 5GTB. I am using lttng in
> petalinux 2019.2(kernel 4.19) .And getting a call Trace error. Refer the below
> log for more details.

> root@xilinx-zcu111-2019_2:~# lttng create
> Spawning a session daemon
> [ 163.902282] lttng_kretprobes: loading out-of-tree module taints kernel.
> [ 163.987461] Unable to handle kernel paging request at virtual address
> 00000000000010c0
> [ 163.995379] Mem abort info:
> [ 163.998179] ESR = 0x96000005
> [ 164.001233] Exception class = DABT (current EL), IL = 32 bits
> [ 164.007149] SET = 0, FnV = 0
> [ 164.010203] EA = 0, S1PTW = 0
> [ 164.013333] Data abort info:
> [ 164.016218] ISV = 0, ISS = 0x00000005
> [ 164.020054] CM = 0, WnR = 0
> [ 164.023028] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000df6dd54e
> [ 164.029646] [00000000000010c0] pgd=0000000000000000, pud=0000000000000000
> [ 164.036447] Internal error: Oops: 96000005 [#1] SMP
> [ 164.041318] Modules linked in: lttng_tracer(O+) lttng_statedump(O)
> lttng_ftrace(O) lttng_kprobes(O) lttng_clock(O) lttng_lib_ring_buffer(O)
> lttng_kretprobes(O) uio_pdrv_genirq
> [ 164.056963] CPU: 1 PID: 4955 Comm: modprobe Tainted: G O 4.19.0-xilinx-v2019.2
> #1
> [ 164.065734] Hardware name: ZynqMP ZCU111 RevA (DT)
> [ 164.070510] pstate: 60000005 (nZCv daif -PAN -UAO)
> [ 164.075429] pc : lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
> [ 164.081767] lr : lttng_tracepoint_notify+0x14c/0x228 [lttng_tracer]
> [ 164.088016] sp : ffffff8011613a40
> [ 164.091314] x29: ffffff8011613a40 x28: ffffff801163f000
> [ 164.096618] x27: 0000000000000100 x26: ffffff800813c958
> [ 164.101921] x25: ffffff8000e22758 x24: 0000000000000000
> [ 164.107225] x23: 00000000000010c0 x22: ffffff8000e42ed8
> [ 164.112528] x21: ffffffc87accc400 x20: ffffff8000e42ef8
> [ 164.117832] x19: 0000000000000001 x18: 0000000000000000
> [ 164.123135] x17: 0000000000000000 x16: 0000000000000000
> [ 164.128439] x15: ffffffffffffffff x14: 0000000000000000
> [ 164.133742] x13: 0000000000000000 x12: 0000000000000000
> [ 164.139046] x11: 0000000000000001 x10: 0101010101010101
> [ 164.144349] x9 : 6d64686b625e6f38 x8 : 706d75645f6c6f63
> [ 164.149653] x7 : 6f746f72705f7039 x6 : ffffffc8778d5ec1
> [ 164.154957] x5 : ffffff8009458000 x4 : 0000000000000000
> [ 164.160260] x3 : ffffff8000db77a0 x2 : ffffffc87828a380
> [ 164.165563] x1 : 0000000000000007 x0 : ffffff8000d13048
> [ 164.170869] Process modprobe (pid: 4955, stack limit = 0x00000000e6162018)
> [ 164.177725] Call trace:
> [ 164.180235] lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
> [ 164.186148] register_tracepoint_module_notifier+0x6c/0x98
> [ 164.191709] lttng_tracepoint_init+0x54/0xc80 [lttng_tracer]
> [ 164.197438] lttng_events_init+0x4c/0x1e0 [lttng_tracer]
> [ 164.202734] do_one_initcall+0x68/0x1ec
> [ 164.206562] do_init_module+0x60/0x1f0
> [ 164.210302] load_module+0x1ca0/0x2270
> [ 164.214035] __se_sys_finit_module+0xc0/0xd0
> [ 164.218288] __arm64_sys_finit_module+0x24/0x30
> [ 164.222802] el0_svc_common+0x98/0x100
> [ 164.226543] el0_svc_handler+0x74/0x90
> [ 164.230275] el0_svc+0x8/0xc
> [ 164.233142] Code: 6b18003f 54fffc49 f9415c00 b8b8d817 (f94002f3)
> [ 164.239226] ---[ end trace c1cc2d1f9d55794a ]---
> [ 195.613567] lttng_ring_buffer_client_overwrite: gave up waiting for init of
> module lttng_tracer.
> [ 195.622371] lttng_ring_buffer_client_overwrite: Unknown symbol
> lttng_transport_unregister (err -16)
> ^C
> root@xilinx-zcu111-2019_2:~# uname -a
> Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26 UTC
> 2022 aarch64 GNU/Linux
> root@xilinx-zcu111-2019_2:~# uname -a
> Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26 UTC
> 2022 aarch64 GNU/Linux
> root@xilinx-zcu111-2019_2:~# [ 226.333565] lttng_ring_buffer_client_overwrite:
> gave up waiting for init of module lttng_tracer.
> [ 226.342368] lttng_ring_buffer_client_overwrite: Unknown symbol lttng_last_tsc
> (err -16)
> [ 257.053564] lttng_ring_buffer_client_overwrite: gave up waiting for init of
> module lttng_tracer.
> [ 257.062358] lttng_ring_buffer_client_overwrite: Unknown symbol
> lttng_transport_register (err -16)
> [ 287.773562] lttng_ring_buffer_client_overwrite: gave up waiting for init of
> module lttng_tracer.
> [ 287.782356] lttng_ring_buffer_client_overwrite: Unknown symbol
> lttng_transport_unregister (err -16)
> [ 318.493567] lttng_ring_buffer_client_overwrite: gave up waiting for init of
> module lttng_tracer.
> [ 318.502364] lttng_ring_buffer_client_overwrite: Unknown symbol lttng_last_tsc
> (err -16)
> [ 349.213564] lttng_ring_buffer_client_overwrite: gave up waiting for init of
> module lttng_tracer.
> [ 349.222363] lttng_ring_buffer_client_overwrite: Unknown symbol
> lttng_transport_register (err -16)

What is the installed lttng-modules version ? 

You can query it with modinfo /lib/modules/$(uname -r)/extra/lttng-tracer.ko

Thanks, 

Mathieu 

> Thank You
> with regards
> G Madhan Mohan

> Disclaimer:- This footer text is to convey that this email is sent by one of the
> users of IITH. So, do not mark it as SPAM.
> _______________________________________________
> lttng-dev mailing list
> lttng-dev@lists.lttng.org
> https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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Re: [lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[Mathieu Desnoyers via lttng-dev]

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----- On Mar 16, 2022, at 8:17 AM, GOLLAMUDI MADHAN MOHAN <madhan.mohan@5g.iith.ac.in> wrote: 

> hi sir,
> lttng version 2.9.5 - Joannès
> modinfo command is not available used $ lttng version command

Hi, 

Please keep the lttng-dev mailing list in CC, as this discussion started there. The 
answers we come up with can be useful to others. 

The version you provided here is the version of lttng-tools installed on your system, 
which is not relevant to investigate your issue. 

What is needed here is the version of lttng-modules: the Linux kernel modules implementing 
the kernel tracing feature of LTTng. Those are different packages altogether. 

May I recommend that you install the package containing the "modinfo" tool on your system 
to query the lttng-modules version ? 

An alternative to query the lttng-modules version, if you really cannot install modinfo, would 
be: 

strings /lib/modules/$(uname -r)/extra/lttng-tracer.ko | grep "^version=" 

Thank you, 

Mathieu 

> Thank You
> with regards
> G Madhan Mohan

> On Tue, Mar 15, 2022 at 9:19 PM Mathieu Desnoyers < [
> mailto:mathieu.desnoyers@efficios.com | mathieu.desnoyers@efficios.com ] >
> wrote:

>> ----- On Mar 15, 2022, at 2:48 AM, lttng-dev [ mailto:lttng-dev@lists.lttng.org
>> | lttng-dev@lists.lttng.org ] wrote:

>> > Dear Sir/Madam,
>> > I am Madhan , working as an embedded engineer in 5GTB. I am using lttng in
>> > petalinux 2019.2(kernel 4.19) .And getting a call Trace error. Refer the below
>> > log for more details.

>> > root@xilinx-zcu111-2019_2:~# lttng create
>> > Spawning a session daemon
>> > [ 163.902282] lttng_kretprobes: loading out-of-tree module taints kernel.
>> > [ 163.987461] Unable to handle kernel paging request at virtual address
>> > 00000000000010c0
>> > [ 163.995379] Mem abort info:
>> > [ 163.998179] ESR = 0x96000005
>> > [ 164.001233] Exception class = DABT (current EL), IL = 32 bits
>> > [ 164.007149] SET = 0, FnV = 0
>> > [ 164.010203] EA = 0, S1PTW = 0
>> > [ 164.013333] Data abort info:
>> > [ 164.016218] ISV = 0, ISS = 0x00000005
>> > [ 164.020054] CM = 0, WnR = 0
>> > [ 164.023028] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000df6dd54e
>> > [ 164.029646] [00000000000010c0] pgd=0000000000000000, pud=0000000000000000
>> > [ 164.036447] Internal error: Oops: 96000005 [#1] SMP
>> > [ 164.041318] Modules linked in: lttng_tracer(O+) lttng_statedump(O)
>> > lttng_ftrace(O) lttng_kprobes(O) lttng_clock(O) lttng_lib_ring_buffer(O)
>> > lttng_kretprobes(O) uio_pdrv_genirq
>> > [ 164.056963] CPU: 1 PID: 4955 Comm: modprobe Tainted: G O 4.19.0-xilinx-v2019.2
>> > #1
>> > [ 164.065734] Hardware name: ZynqMP ZCU111 RevA (DT)
>> > [ 164.070510] pstate: 60000005 (nZCv daif -PAN -UAO)
>> > [ 164.075429] pc : lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
>> > [ 164.081767] lr : lttng_tracepoint_notify+0x14c/0x228 [lttng_tracer]
>> > [ 164.088016] sp : ffffff8011613a40
>> > [ 164.091314] x29: ffffff8011613a40 x28: ffffff801163f000
>> > [ 164.096618] x27: 0000000000000100 x26: ffffff800813c958
>> > [ 164.101921] x25: ffffff8000e22758 x24: 0000000000000000
>> > [ 164.107225] x23: 00000000000010c0 x22: ffffff8000e42ed8
>> > [ 164.112528] x21: ffffffc87accc400 x20: ffffff8000e42ef8
>> > [ 164.117832] x19: 0000000000000001 x18: 0000000000000000
>> > [ 164.123135] x17: 0000000000000000 x16: 0000000000000000
>> > [ 164.128439] x15: ffffffffffffffff x14: 0000000000000000
>> > [ 164.133742] x13: 0000000000000000 x12: 0000000000000000
>> > [ 164.139046] x11: 0000000000000001 x10: 0101010101010101
>> > [ 164.144349] x9 : 6d64686b625e6f38 x8 : 706d75645f6c6f63
>> > [ 164.149653] x7 : 6f746f72705f7039 x6 : ffffffc8778d5ec1
>> > [ 164.154957] x5 : ffffff8009458000 x4 : 0000000000000000
>> > [ 164.160260] x3 : ffffff8000db77a0 x2 : ffffffc87828a380
>> > [ 164.165563] x1 : 0000000000000007 x0 : ffffff8000d13048
>> > [ 164.170869] Process modprobe (pid: 4955, stack limit = 0x00000000e6162018)
>> > [ 164.177725] Call trace:
>> > [ 164.180235] lttng_tracepoint_notify+0x188/0x228 [lttng_tracer]
>> > [ 164.186148] register_tracepoint_module_notifier+0x6c/0x98
>> > [ 164.191709] lttng_tracepoint_init+0x54/0xc80 [lttng_tracer]
>> > [ 164.197438] lttng_events_init+0x4c/0x1e0 [lttng_tracer]
>> > [ 164.202734] do_one_initcall+0x68/0x1ec
>> > [ 164.206562] do_init_module+0x60/0x1f0
>> > [ 164.210302] load_module+0x1ca0/0x2270
>> > [ 164.214035] __se_sys_finit_module+0xc0/0xd0
>> > [ 164.218288] __arm64_sys_finit_module+0x24/0x30
>> > [ 164.222802] el0_svc_common+0x98/0x100
>> > [ 164.226543] el0_svc_handler+0x74/0x90
>> > [ 164.230275] el0_svc+0x8/0xc
>> > [ 164.233142] Code: 6b18003f 54fffc49 f9415c00 b8b8d817 (f94002f3)
>> > [ 164.239226] ---[ end trace c1cc2d1f9d55794a ]---
>> > [ 195.613567] lttng_ring_buffer_client_overwrite: gave up waiting for init of
>> > module lttng_tracer.
>> > [ 195.622371] lttng_ring_buffer_client_overwrite: Unknown symbol
>> > lttng_transport_unregister (err -16)
>> > ^C
>> > root@xilinx-zcu111-2019_2:~# uname -a
>> > Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26 UTC
>> > 2022 aarch64 GNU/Linux
>> > root@xilinx-zcu111-2019_2:~# uname -a
>> > Linux xilinx-zcu111-2019_2 4.19.0-xilinx-v2019.2 #1 SMP Mon Mar 14 15:09:26 UTC
>> > 2022 aarch64 GNU/Linux
>> > root@xilinx-zcu111-2019_2:~# [ 226.333565] lttng_ring_buffer_client_overwrite:
>> > gave up waiting for init of module lttng_tracer.
>> > [ 226.342368] lttng_ring_buffer_client_overwrite: Unknown symbol lttng_last_tsc
>> > (err -16)
>> > [ 257.053564] lttng_ring_buffer_client_overwrite: gave up waiting for init of
>> > module lttng_tracer.
>> > [ 257.062358] lttng_ring_buffer_client_overwrite: Unknown symbol
>> > lttng_transport_register (err -16)
>> > [ 287.773562] lttng_ring_buffer_client_overwrite: gave up waiting for init of
>> > module lttng_tracer.
>> > [ 287.782356] lttng_ring_buffer_client_overwrite: Unknown symbol
>> > lttng_transport_unregister (err -16)
>> > [ 318.493567] lttng_ring_buffer_client_overwrite: gave up waiting for init of
>> > module lttng_tracer.
>> > [ 318.502364] lttng_ring_buffer_client_overwrite: Unknown symbol lttng_last_tsc
>> > (err -16)
>> > [ 349.213564] lttng_ring_buffer_client_overwrite: gave up waiting for init of
>> > module lttng_tracer.
>> > [ 349.222363] lttng_ring_buffer_client_overwrite: Unknown symbol
>> > lttng_transport_register (err -16)

>> What is the installed lttng-modules version ?

>> You can query it with modinfo /lib/modules/$(uname -r)/extra/lttng-tracer.ko

>> Thanks,

>> Mathieu

>> > Thank You
>> > with regards
>> > G Madhan Mohan

>> > Disclaimer:- This footer text is to convey that this email is sent by one of the
>> > users of IITH. So, do not mark it as SPAM.
>> > _______________________________________________
>> > lttng-dev mailing list
>> > [ mailto:lttng-dev@lists.lttng.org | lttng-dev@lists.lttng.org ]
>>> [ https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev |
>> > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ]
>> --
>> Mathieu Desnoyers
>> EfficiOS Inc.
>> [ http://www.efficios.com/ | http://www.efficios.com ]

> Disclaimer:- This footer text is to convey that this email is sent by one of the
> users of IITH. So, do not mark it as SPAM.

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 

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Re: [lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[Michael Jeanson via lttng-dev]

On 2022-03-16 09:25, Mathieu Desnoyers via lttng-dev wrote:
> An alternative to query the lttng-modules version, if you really cannot
> install modinfo, would
> be:
> 
> strings /lib/modules/$(uname -r)/extra/lttng-tracer.ko | grep "^version="

Assuming a somewhat recent version of lttng-modules, the version will also be
printed to dmesg when the modules are loaded.
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Re: [lttng-dev] call trace while using lttng in petalinux 2019.2 (kernel 4.19)

[Mathieu Desnoyers via lttng-dev]

----- On Mar 16, 2022, at 10:54 AM, lttng-dev lttng-dev@lists.lttng.org wrote:

> On 2022-03-16 09:25, Mathieu Desnoyers via lttng-dev wrote:
>> An alternative to query the lttng-modules version, if you really cannot
>> install modinfo, would
>> be:
>> 
>> strings /lib/modules/$(uname -r)/extra/lttng-tracer.ko | grep "^version="
> 
> Assuming a somewhat recent version of lttng-modules, the version will also be
> printed to dmesg when the modules are loaded.

This "LTTng: Loaded modules..." printk was added in v2.9.10 in the stable-2.9 branch of
lttng-modules. I suspect that the version of lttng-modules is even older here.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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