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There seems to be a bug with Zephyr Squad .I am unable to access Cycle summary to create test cycles, every time I click on Cycle Summary I am taken to Test Summary page . Here on the Test Summary page if I click on "Unscheduled" under search by versions section, I'm taken to JIRA issue filters.


Demand paging provides a mechanism where data is only brought into physicalmemory as required by current execution context. The physical memory isconceptually divided in page-sized page frames as regions to hold data.


When the processor tries to access the data page that does not existin any page frames, a page fault occurs. The paging code then brings inthe corresponding data page from backing store into physical memory ifthere is a free page frame. If there is no more free page frames,the eviction algorithm is invoked to select a data page to be paged out,thus freeing up a page frame for new data to be paged in. If this datapage has been modified after it is first paged in, the data will bewritten back into the backing store. If no modifications is done orafter written back into backing store, the data page is now consideredpaged out and the corresponding page frame is now free. The paging codethen invokes the backing store to page in the data page corresponding tothe location of the requested data. The backing store copies that datapage into the free page frame. Now the data page is in physical memoryand execution can continue.


There are functions where paging in and out can be invoked manuallyusing k_mem_page_in() and k_mem_page_out().k_mem_page_in() can be used to page in data pagesin anticipation that they are required in the near future. This is used tominimize number of page faults as these data pages are already in physicalmemory, and thus minimizing latency. k_mem_page_out() can beused to page out data pages where they are not going to be accessed fora considerable amount of time. This frees up page frames so that the nextpage in can be executed faster as the paging code does not need to invokethe eviction algorithm.






A page frame is a page-sized physical memory region in RAM. It is acontainer where a data page may be placed. It is always referred to byphysical address. Zephyr has a convention of using uintptr_t for physicaladdresses. For every page frame, a struct z_page_frame is instantiated tostore metadata. Flags for each page frame:


The virtual address of a special page provided to the backing store to:* Copy a data page from Z_SCRATCH_PAGE to the specified location; or,* Copy a data page from the provided location to Z_SCRATCH_PAGE.This is used as an intermediate page for page in/out operations. Thisscratch needs to be mapped read/write for backing store code to access.However the data page itself may only be mapped as read-only in virtualaddress space. If this page is provided as-is to backing store,the data page must be re-mapped as read/write which has securityimplications as the data page is no longer read-only to other parts ofthe application.


The eviction algorithm is used to determine which data page and itscorresponding page frame can be paged out to free up a page framefor the next page in operation. There are two functions which arecalled from the kernel paging code:


k_mem_paging_eviction_select() is called to selecta data page to evict. A function argument dirty is written tosignal the caller whether the selected data page has been modifiedsince it is first paged in. If the dirty bit is returnedas set, the paging code signals to the backing store to writethe data page back into storage (thus updating its content).The function returns a pointer to the page frame corresponding tothe selected data page.


Currently, a NRU (Not-Recently-Used) eviction algorithm has beenimplemented as a sample. This is a very simple algorithm whichranks each data page on whether they have been accessed and modified.The selection is based on this ranking.


k_mem_paging_backing_store_location_get() is called toreserve a backing store location so a data page can be paged out.This location token is passed tok_mem_paging_backing_store_page_out() to perform actualpage out operation.


After the function completes, all the page frames associated with this function will be paged in. However, they are not guaranteed to stay there. This is useful if the region is known to be used soon.


The returned location token must be unique to the mapped virtual address. This location will be used in the backing store to page out data page contents for later retrieval. The location value must be page-aligned.


This function may be called multiple times on the same data page. If its page frame has its Z_PAGE_FRAME_BACKED bit set, it is expected to return the previous backing store location for the data page containing a cached clean copy. This clean copy may be updated on page-out, or used to discard clean pages without needing to write out their contents.


If the backing store is full, some other backing store location which caches a loaded data page may be selected, in which case its associated page frame will have the Z_PAGE_FRAME_BACKED bit cleared (as it is no longer cached).


pf->addr will indicate the virtual address the page is currently mapped to. Large, sparse backing stores which can contain the entire address space may simply generate location tokens purely as a function of pf->addr with no other management necessary.


This function distinguishes whether it was called on behalf of a page fault. A free backing store location must always be reserved in order for page faults to succeed. If the page_fault parameter is not set, this function should return -ENOMEM even if one location is available.


This is invoked after k_mem_paging_backing_store_page_in() and interrupts have been* re-locked, making it safe to access the z_page_frame data. The location value will be the same passed to k_mem_paging_backing_store_page_in().


The primary use-case for this is to update custom fields for the backing store in the page frame, to reflect where the data should be evicted to if it is paged out again. This may be a no-op in some implementations.


If the backing store caches paged-in data pages, this is the appropriate time to set the Z_PAGE_FRAME_BACKED bit. The kernel only skips paging out clean data pages if they are noted as clean in the page tables and the Z_PAGE_FRAME_BACKED bit is set in their associated page frame.


If the backing store already contains all or some loaded kernel data pages at boot time, Z_PAGE_FRAME_BACKED should be appropriately set for their associated page frames, and any internal accounting set up appropriately.


The new changes made to Zephyr test case are not saved automatically. It does not prompt to save unsaved changes while navigating to those Jira pages. It prompts to save unsaved changes while navigating to Zephyr pages only.


So I have started to expand my studies on both the zephyr os and the development kit. I have noted that my serial communication from net core are now blocked. But this can be a problem from both linux or cable or my mistake.


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I started out with the zephyr knowing that I would upgrade eventually and wanted to save the money to buy all of the other bits that would transfer over to a bigger rig (matte box, BFD, etc.). I'm mostly shooting C300 and RED at the moment, but the Alexa has come up and it's got my gears going about an upgrade.


I know it's not recommended to upgrade the individual parts incrementally to increases performance (such as upgrading just the arm to get more weight capacity) because everything is made to work together. I'm thinking of doing just that, upgrading to the G50x only, but not for immediate weight bearing improvements, more as a strategic investment. Now that I've got the zephyr paid off I would love to buy each piece and pay them off individually rather than sitting underneath a $30K investment all at once. This way I could wait and see how things shake out in the next 6 months or so and decide which sled to go with.


I own a zephyr, and I also feel like I am sometimes reaching to the limit of the rig. But the bottle neck in my eyes is not the lift capacity of the arm, but rather the dimension of the centerpost. I get more and more vibrations in it with a heavy load. And it's not a loose piece, it is the post arching and bending under the weight of the top and bottom stages. Have a look at a Pro's package with the atlas arm, or look for a used rig + arm + vest. That's what I will do.


Popular among our team is the Network Shell for networking diagnostics, and the OpenThread Shell was used extensively in getting our Open Thread demo up and running. I have used the Kconfig Search page on the Zephyr docs to search for other shells and that yields a lot of really interesting info.


Last week we changed the name of our SDK from zephyr-sdk to golioth-zephyr-sdkto make it clear this code is for using Golioth device management features with Zephyr. We also updated our recommended install directory names to golioth-zephyr-workspace and golioth-ncs-workspace.

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