How can I get various info about the device internal state and behavior?

[dujingwen]

Hi,
I want to get some values like erase count, device space usage ratio, migration page count during garbage collection , L2P mapping info and so on. But how can I print or view/check this info? Thanks in advance.

[WaterccL]

The struct ssdstate consists of written_page number.

     /* SSD Util */
    double ssd_util;
    int64_t written_page_nb;

    /* Mapping table */
    int64_t *mapping_table;

If you want to print such information, you may need to modify the source code and recompile it.

[theanoli]

It seems the ssdstate struct isn't around anymore (and I can't find a page write counter elsewhere). If I wanted to track the number of page writes, would it be best to put the counter in the NANDFlashState struct, and then increment the counter in the nand_blk_write_ function (here)?

[huaicheng]

Hi,

You might want to check code under hw/block/femu/ftl/. The ideal place to add the counter you need is ssd_advance_status(), which is called every time a NAND level I/O needs to be triggered.