Commit e11f02f5 authored by Oleg Dzhimiev's avatar Oleg Dzhimiev Committed by GitHub

Update README.md

more info
parent 12d081ff
# debugfs-webgui # debugfs-webgui
Simplify the Linux kernel dynamic debug Simpler, more flexible and convenient Linux kernel dynamic debug (dyndbg)
## Features ## Features
* multiple configs for each file * multiple configs for each file
...@@ -10,34 +10,38 @@ Simplify the Linux kernel dynamic debug ...@@ -10,34 +10,38 @@ Simplify the Linux kernel dynamic debug
<img src="http://community.elphel.com/pictures/debugfs-webgui/debugfs-webgui.png" width="560" alt="debugfs-webgui screenshot" align='middle' > <img src="http://community.elphel.com/pictures/debugfs-webgui/debugfs-webgui.png" width="560" alt="debugfs-webgui screenshot" align='middle' >
## Target system requirements ## Target system requirements
* web server (e.g. apache2) + PHP * web server (e.g. Apache2) + PHP
## Install ## Install
* transfer files to the target system * copy files to the target system
* make them accessible through the web server * make them accessible through the web server
## Manual ## Manual
* http://target-ip/webserver-path-to-degufs.html/debugfs.html * Open http://target-ip/webserver-path-to-degufs.html/debugfs.html
* **Edit list** - displays all and allows to select the files of interest * **f**, **l**, **m**, **t** flags are applied on page load/refresh, also use checkboxes
* **Save to persistent storage** - copies current config from tmpfs to disk of the target system * click **Edit list** to display all files and select the files of interest
* **Apply to debugfs** - applies config from the selected in web GUI files to debugfs * click **Apply to debugfs** to apply restored config to debugfs - restored config is not applied on page load/refresh - it's just read from the stored config file.
* **Switch off debug** - turns off debug of all of the files of interest * click on a filename to expand available debug options
* Click on the filename to expand available debug options * use checkboxes to control (command is sent on change)
* Check the checkbox next to the line number to enable line (adds **+p**) - uncheck to disable (**-p**) - the command is sent on change * click **read lines from debugfs** if the source has changed (line numbers got shifted) to update config - checkboxes will keep their states.
* **read lines from debugfs** - updates line numbers if the source has changed but the old config is loaded, the checkboxes states pattern is kept. * use the green dropdown menu in the file's table to create and select individual configs.
* Use the green dropdown menu in the file's table to create and select individual configs. * click **Save to persistent storage** - copies current config from *tmpfs* to the target system's persistent storage (mounted rootfs, the same dir as *debugfs.php*)
* click **Switch off debug** to turn off debug in all of the files of interest.
## Notes
* *debugfs.json* stored the same dir as *debugfs.php* is the global file in *json* format. It stores all individual configs.
* *jquery.ajax.queue.js* plugin is used to send ajax requests sequentially to resolve racing condition in accessing the global config file.
* On page load/refresh debugfs.php tries to restore the global config in the following order:
* from *tmpfs* (*/tmp/debugfs.json*) - is a working copy, don't not forget to save it before reboot.
* from the target system's persistent storage (*debugfs.json* - mounted rootfs, the same dir as *debugfs.php*). Copied to */tmp/debugfs.json*.
* from debugfs (*/sys/kernel/debug/dynamic_debug/control*). Copied into */tmp/debugfs.json*. **Save to persistent storage** - to create persistent config.
* Depending on the number of selected files ajax requests can take some time:
* single debug message - quick
* **f**,**l**,**m**,**t**, **apply to debugfs** - 100+ms - depends on the number of files.
## Behind the scenes ## Behind the scenes
* javascript + php * Javascript + PHP
* other javascript libraries: * JavaScript libraries:
* [jQuery](https://jquery.com/) * [jQuery](https://jquery.com/)
* [jquery.ajax.queue.js](https://blog.alexmaccaw.com/queuing-ajax-requests) * [jquery.ajax.queue.js](https://blog.alexmaccaw.com/queuing-ajax-requests)
* [Bootstrap](http://getbootstrap.com/) * [Bootstrap](http://getbootstrap.com/)
* **f**, **l**, **m**, **t** flags are applied on load/refresh of the page
* On page load/refresh debugfs.php tries to restore the global config in the following order:
* from tmpfs (*/tmp/debugfs.json*) - it is a working copy
* from target system's persistent storage (mounted rootfs, in the same folder where *debugfs.php*). Copies to the working copy.
* from debugfs (*/sys/kernel/debug/dynamic_debug/control*). Reads and creates the working copy.
* Global config format is *json*.
* *jquery.ajax.queue.js* plugin is used to send ajax requests sequentially to resolve racing condition in access the global config file.
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