Hi Martin, thanks for your detailed and excellent explanation of what
has changed with quota accounting. I'll assume the "quota exceeded"
message is simply informational for now while I tackle an an apparent IO
mapping issue.
The scenario I run includes sdcard, gpio, gp timers, uarts, i2c, and PWM
drivers and vfs is also in there. All of this, with my modified base-hw
kernel, appears to be running as it does in 15.02 with the exception of
the PWM driver. The log from the 15.11 implementation shows nothing
exceptional (attached) and is practically identical to what is output on
15.02. Running my PWM driver in verbose mode shows that data received
from sensors on the i2c bus and from a manual input controller is being
correctly received, processed, and sent to the PWM driver. The PWM does
some signal conditioning and writes updated duty cycle values to an IO
register from which the SoC's pwm subsystem sends the modified pulse to
an IO pin. That pin is attached to a motor ESC which provides the power
to drive the motor. The motor never receives the pulse. So, presumably,
there is an issue with IO mapping and the signal is not going to the
correct register location. I notice in the 5.11 release notes that there
have been changes in the area of memory mapped IO, so I'm starting to
explore that avenue. I have not touched the PWM driver code in more than
a year so I doubt that the problem is there.
Bob
On 12/03/2015 04:27 AM, Martin Stein wrote:
Hello Bob,
Am 02.12.2015 um 15:17 schrieb Bob Stewart:
I just upgraded from 15.02 to 15.11 and ran my base-hw based os and
applications, which have been running for some time on 15.02. The
changes made during the update were to the directory structure required
by the "platform" changes and gpio driver changes to accomodate the
removal of the wait_for_irq method.
It's nice to hear that you already got your hands on the new release :)
immediately after init starts I get a "quota execeeded"mesage:
Starting kernel ...
kernel initialized
Genode 15.11 <local changes>
int main(): --- create local services ---
int main(): --- start init ---
int main(): transferred 501 MB to init
int main(): --- init created, waiting for exit condition ---
Quota exceeded! amount=12288, size=12288, consumed=12288
[init -> uart_drv] int main(int, char**): --- OMAP3 UART driver started ---
[init -> ctrl_module] --- Beaglebone Control Module Server ---
[init -> platform_drv] --- bbb platform driver running ---
[init -> pwm_drv] --- am33xx pwm driver ---
.
,
,
No changes have been made to available ram constants in board_base so
I'm confused as to what caused this message to be generated. Did I miss
a change to how quota's are requested and managed?
Since 15.05, the accounting of quota on base-hw got much more
comprehensive. Most notably, for the costs of PD related things like the
page tables [1] or the local representations of capabilities [2] a
component must now pay via quota. I assume that your "Quota exceeded" is
printed by the Allocator_guard [3] (Otherwise it could only be a
'loader' server component which is unlikely).
The basic sessions (say those of the Genode environment) are given an
initial amount of quota. This amount is a guess on how much is needed to
bring the component up. If this quota does not suffice, the session asks
the parent to upgrade it by using some of the components slack quota. If
its slack quota isn't sufficient for that, the component still may ask
its parent to donate some more. So, the quota you assign to a component
via the init configuration is the guaranteed minimum the component
receives. Init may or may not - depending from what is left after
starting all children and saving some quota for itself - hand in more
quota to components if they ask for.
During these mechanisms, the Allocator_guard is the one that applies
given quota limits to allocations by wrapping the background allocator.
That said, the warning indicates that you've reached a limit but it does
not necessarily indicate a problem as, in return, your scenario may be
able to relax the limit.
And even more, there are places in Genode where reaching the limit is
expected. My favourite explanation in your case is the
upgrade_pd_session_quota function that triggers such behaviour. It is,
for example, called when receiving capabilities in IPC and not having
enough PD quota to create local references [4]. It results in a call of
Capability_space::upgrade_slab in core [5]. This function currently
allocates as much additional SLAB blocks as possible and, by doing so,
always triggers the warning. The reason for this is that it's hard to
measure how much additional blocks are needed at this point. Maybe you
could give it a try and test if this is responsible for your warning.
If so, the warning is no problem and I wonder whether your scenario runs
properly apart from it. It would also be interesting to know whether
you've sent the complete log output (what is the meaning of the point
and the commas?). Please note that we're already planning to change
output behaviour on reaching quota limits as it provides little
information and can obviously be misleading.
Cheers,
Martin
[1] Commit cc58b11 hw: replace page table allocator with static one
[2] Commit e081554 hw: kernel backed capabilities (Fix #1443)
[3] repos/base/include/base/allocator_guard.h
[4] repos/base-hw/src/base/ipc/ipc.cc
[5] repos/base-hw/src/core/platform_pd.cc
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Starting kernel ...
kernel initialized
Genode 15.11 <local changes>
int main(): --- create local services ---
int main(): --- start init ---
int main(): transferred 501 MB to init
int main(): --- init created, waiting for exit condition ---
Quota exceeded! amount=12288, size=12288, consumed=12288
[init -> uart_drv] int main(int, char**): --- OMAP3 UART driver started ---
[init -> ctrl_module] --- Beaglebone Control Module Server ---
[init -> platform_drv] --- bbb platform driver running ---
[init -> pwm_drv] --- am33xx pwm driver ---
[init -> sd_card_drv] --- OMAP3 SD card driver ---
[init -> ctrl_module] gpio 4 mode 2 dirn=1, pullup or down = 1
[init -> ctrl_module] gpio 5 mode 2 dirn=1, pullup or down = 1
[init -> ctrl_module] gpio 22 mode 4 dirn=0, pullup or down = 0
[init -> ctrl_module] gpio 23 mode 4 dirn=0, pullup or down = 0
[init -> ctrl_module] gpio 50 mode 6 dirn=0, pullup or down = 0
[init -> ctrl_module] gpio 51 mode 6 dirn=0, pullup or down = 0
[init -> ctrl_module] gpio 66 mode 7 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 67 mode 7 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 68 mode 7 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 69 mode 7 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 89 mode 7 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 78 mode 4 dirn=0, pullup or down = 0
[init -> ctrl_module] gpio 79 mode 4 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 110 mode 6 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 111 mode 6 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 112 mode 6 dirn=1, pullup or down = 0
[init -> ctrl_module] gpio 113 mode 6 dirn=1, pullup or down = 0
[init -> dmtimer_drv]
DMTimer_driver::DMTimer_Control::DMTimer_Control(Genode::ad
dr_t, Genode::size_t, int, unsigned int): Starting dmtimer 4, irq 92
[init -> bbb_platform_client] --- bbb platform being configured ---
[init -> bbb_platform_client] Enabled dmtimer 3 freq = 2
[init -> bbb_platform_client] Enabled dmtimer 4 freq = 1
[init -> bbb_platform_client] Enabled dmtimer 5 freq = 1
[init -> bbb_platform_client] Enabled dmtimer 6 freq = 1
[init -> bbb_platform_client] Enabled dmtimer 7 freq = 1
[init -> bbb_platform_client] Enabled PWM 1
[init -> bbb_platform_client] Enabled PWM 2
[init -> bbb_platform_client] Enabled UART 5
[init -> platform_drv] void Ccm::ipu_clk_enable(BeagleBoneBlack::Device):
Enablin
g MMC0
[init -> bbb_platform_client] Enabled MMC 0
[init -> platform_drv] void Ccm::ipu_clk_enable(BeagleBoneBlack::Device):
Enablin
g MMC1
[init -> bbb_platform_client] Enabled MMC 1
[init -> bbb_platform_client] Enabled I2C 1
[init -> platform_drv] void Ccm::ipu_clk_enable(BeagleBoneBlack::Device):
Enablin
g PRUSS
[init -> bbb_platform_client] Enabled PRUSS 0
[init] virtual void Genode::Child_policy::exit(int): child
"bbb_platform_client"
exited with exit value 0
[init -> pwm_drv] PWM port 0, num 1, period 31250, duty 1562, polarity 1,
name=No
rth
[init -> pwm_drv] PWM port 1, num 1, period 31250, duty 1562, polarity 1,
name=So
uth
[init -> pwm_drv] PWM port 0, num 2, period 31250, duty 1562, polarity 1,
name=Ea
st
[init -> pwm_drv] PWM port 1, num 2, period 31250, duty 1562, polarity 1,
name=We
st
[init -> dmtimer_drv] --- am33xx DMtimer driver ---
[init -> gpio_drv] --- am33xx gpio driver ---
[init -> i2c_drv] --- am33xx i2c driver ---
[init -> gpio_drv] gpio 53 mode O value=0
[init -> gpio_drv] gpio 54 mode O value=0
[init -> gpio_drv] gpio 55 mode O value=0
[init -> gpio_drv] gpio 56 mode O value=0
[init -> Autopilot] void init_libc_ffat(): using the libc_ffat plugin
[init -> Autopilot] --- Autopilot application starting ---
[init -> Autopilot] fault handler: waiting for fault signal
[init -> sd_card_drv] CID: 0x1d414453 0x44202020 0x02b16703 0xea00d927
[init -> sd_card_drv] RCA: 0x59b4
[init -> sd_card_drv] Block::Omap3_driver::Omap3_driver(bool): SDCard driver
gett
ing mmc1 ready with dma 0
[init -> sd_card_drv] SD card detected
[init -> sd_card_drv] capacity: 60303 MiB
[init -> Autopilot] /Autopilot/ap_config.xml file size: 597 bytes
[init -> Autopilot] int main(): AP config read 597 bytes
[init -> Autopilot] Autopilot::Datalogger::~Datalogger(): Datalogger object
endin
g
[init -> pwm_drv] 4 Motors initialized
[init -> Autopilot] mktime() returned -1, the file modification time reported
by
stat() will be incorrect
[init -> Autopilot] /Autopilot/ap_pru0.bin file size: 492 bytes
[init -> Autopilot] mktime() returned -1, the file modification time reported
by
stat() will be incorrect
[init -> Autopilot] /Autopilot/ap_pru1.bin file size: 1348 bytes
[init -> Autopilot] virtual void Pruss::Pruss_ctl::entry(): Loaded pru_0
program
123 words
[init -> Autopilot] virtual void Pruss::Pruss_ctl::entry(): Loaded pru_1
program
337 words
[init -> Autopilot] Autopilot::Datalogger::~Datalogger(): Datalogger object
endin
g
[init -> Autopilot] Autopilot::Datalogger::~Datalogger(): Datalogger object
endin
g
[init -> Autopilot] PRUSS Initialized
[init -> Autopilot] LSM303D accel found
[init -> Autopilot] L3GD20H gyro found on I2C bus
[init -> Autopilot] LSM303D magn found
[init -> uart_drv] virtual Uart::Driver* main(int,
char**)::Omap_uart_driver_fact
ory::create(unsigned int, unsigned int, Uart::Char_avail_callback&): Baudrate
is
not defined. Use default 115200
[init -> Autopilot] /Autopilot/ap_config.xml file size: 597 bytes
[init -> Autopilot] Autopilot::System_param::System_param(Autopilot::sm*):
System
_param object created
[init -> Autopilot] virtual void Autopilot::Gyros::entry(): writing gyro zero 0
a
s -129
[init -> Autopilot] virtual void Autopilot::Gyros::entry(): writing gyro zero 1
a
s 369
[init -> Autopilot] virtual void Autopilot::Gyros::entry(): writing gyro zero 2
a
s 6
[init -> Autopilot] control loop until end
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