> Cannot Read
> Cannot Read From Target Processor Is Stalled At Memory Access
Cannot Read From Target Processor Is Stalled At Memory Access
Stop CPU Activities When Stopped When this option is checked, some peripheral functions are stopped when the application is stopped. For example, on x86_64: # perf probe -x /lib64/libc-2.17.so '--add=malloc size=%di' probe_libc:malloc (on 0x800c0 with size=%di) These registers ("%di" etc) are dependent on your processor architecture. Static Tracing The following examples demonstrate static tracing: the instrumentation of tracepoints and other static events. Since WDDM driver model virtualizes this memory, applications no longer need to keep track of what kind of memory resources are created in. his comment is here
Along with pipelining, this is how IPC can become greater than one, as more than one instruction can be completed ("retired") per CPU cycle. Also, loose cable connections are more difficult to troubleshoot, as they may work fine at certain times. Other Options The perf subcommands, especially perf stat, have an extensive option set which can be listed using "-h". If this delay is not acceptable for a specific application, the option should be unchecked. https://forums.xilinx.com/t5/Embedded-Development-Tools/ML605-Microblaze-processor-hangs-when-reading-from-a-custom-core/td-p/192420/page/2
New Processes Tracing new processes triggered by a "man ls": # perf record -e sched:sched_process_exec -a ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured With swapping, the mechanisms and the performance ratios are different. Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! The variable gets a value 0x1233, which is invalid for the application and hangs the application.
This error can either have two variants: near or far from itself, which means the JTAG circuit is broken close to the JTAG debug probe or close to the board. In general using an isolated JTAG debugger or an adapter helps with this issue.  Common errors Host connection error The error below is thrown by CCS when the device driver A video of the talk is on youtube, and the slides are on slideshare. The USB cable has loose contacts or not connected at all.
TVRef should be connected to the IO voltage through a small current limiting resistor. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. XDS200, XDS560 and XDS560v2: Error initializing emulator: (Error -2083 @ 0x0) Unable to communicate with the debug probe. https://msdn.microsoft.com/en-us/library/windows/desktop/bb205132(v=vs.85).aspx The command buffer is flushed, thus causing a user/kernel mode switch, in one of four situations, which are as follows.
You can also print these out as a perf_events cheatsheet. 3. If a task needs data to be loaded from swap, the load instruction triggers a trap which executes kernel code to allocate a page in RAM and load its content from The sshd path shows writes. 6.5. The processor keeps track of which threads are stalled on a long-latency load miss and which are ready for their next instruction and it uses a simple FIFO scheduling strategy on
perf_events is part of the Linux kernel, under tools/perf. https://books.google.com/books?id=A4apCgAAQBAJ&pg=PA3867&lpg=PA3867&dq=cannot+read+from+target+processor+is+stalled+at+memory+access&source=bl&ots=uuxOYH8u_K&sig=6tgGfduxatL6fOeHD205TZsSB10&hl=en&sa=X&ved=0ahUKEwjQjq-Kk The reason for this is that real-time accesses are visible on the trace port and would conflict with thetrace reconstruction. •Caution on trace display sequence When the trace mode that displays For that reason, mapping of resources created with default usage should be done with care. This is an unrecoverable error that prevents the JTAG debugger from halting the core.
Scan tests: 3, skipped: 0, failed: 3 Do a test using 0x01FC1F1D. http://fortecrm.net/cannot-read/cannot-read-the.html system.mhs 85 KB Message 18 of 18 (4,598 Views) Reply 0 Kudos « Previous 1 2 Next » « Message Listing « Previous Topic Next Topic » Download XilinxGo Mobile app every 6ms by an external reset circuit. This can be caused by several sources of errors: a problem in the FTDI chip, bad I/O pins on the debug probe, issues on the circuit between the FTDI chip and
Profiling (sampling) events are not listed. 5.1. Error: (Error -1170 @ 0x0) Unable to access the DAP. The value is '-150' (0xffffff6a). weblink Accessing Resource Data Accessing a resource requires mapping the resource; mapping essentially means the application is trying to give the CPU access to memory.
The explanation is: An attempt to connect to the XDS110 failed. Wikipedia makes it a synonym for FGMT. (I can accept applying "barrel processor" to round robin with skipping, though that breaks the analogy as a missing stave (cf. In this case, a procedure of resetting the JTAG debugger using dbgjtag was reported to being effective to restore communications.
Error connecting to the target: (Error -183 @ 0x0) The controller has detected a cable break far-from itself.
Software Events: These are low level events based on kernel counters. I suspected that doesn't affect me.Latest greatest news is that I can debug the MZ. It dicusses techniques to avoid stalling such as thread switching, OOE and out of order memory operations, although it never really gives much about the intricacies of modern designs, as like Dynamic Tracing 6.6.
Invalid license This error means you are trying to connect to a JTAG debugger unsupported by the Free Evaluation License. The debug probe firmware is incompatible with the OS. Do a test using 0xFFFFFFFF. http://fortecrm.net/cannot-read/cannot-read-ppt.html This makes it easy to interpret: stalls are latency, reduce stalls.
Now a similar profile with CONFIG_FRAME_POINTER=y: 99.97% swapper [kernel.kallsyms] [k] default_idle | --- default_idle cpu_idle | |--87.50%-- start_secondary | --12.50%-- rest_init start_kernel x86_64_start_reservations x86_64_start_kernel 0.03% sshd [kernel.kallsyms] [k] iowrite16 | --- Check if the target configuration file (.ccxml) accurately describes your JTAG debug probe (Connection) and target (Device or Board). Try to use the static tracepoints first, since their interface should be much more stable. lower TCLK).
As of Linux 4.4, perf has some enhanced BPF support (formally "eBPF"), with more in later kernels. Dynamic Tracing. 6. In the particular case of CUDA, at least dozens, if not hundreds, of warps of threads are usually loaded on a given multiprocessor at any given time, with each thread (hundreds Since resources created with this flag cannot be set as outputs of the pipeline, if the CPU wants to read the data in a resource generated by the GPU, the data
Not a member? Use real-time access while being fully aware of its restrictions. 2) Since stalling the CPU is not acceptable for most target applications, iSYSTEM offers an alternative solution without this restriction, called What code-paths? If one chooses to define "stall" as a cycle in which no execution units dispatch uops, then the performance counter event of interest appears to be Event 0xA3, Umask 0x04 CYCLES_ACTIVITY.CYCLES_NO_DISPATCH.