fs/pstore question

fs/pstore question

[Ronny Meeus]

Hello

I'm using the pstore feature to log kernel crashes.

What I observe is that after reboot, always 2 entries are present in the pstore:

ls -l /mnt/pstore
total 0
-r--r--r--    1 root     root         16372 Jan  1 00:00 dmesg-ramoops-0
-r--r--r--    1 root     root         16372 Jan  1 00:00 dmesg-ramoops-1

If I do not delete the entries and force a new crash, only 2 new
entries are available
after the system is online again and the older entries are overwritten.

The reason for this is that the write index is always initialized to 0
during init.
Is this intentional? I would expect that existing entries are kept
until they are explicitly
deleted or the storage is full. In the latter case the oldest entries
can be replaced.

Best regards,
Ronny

Re: fs/pstore question

[Ronny Meeus]

Op do 9 mei 2019 10:05 schreef Ronny Meeus <ronny.meeus@gmail.com>:
>
> Hello
>
> I'm using the pstore feature to log kernel crashes.
>
> What I observe is that after reboot, always 2 entries are present in the pstore:
>
> ls -l /mnt/pstore
> total 0
> -r--r--r--    1 root     root         16372 Jan  1 00:00 dmesg-ramoops-0
> -r--r--r--    1 root     root         16372 Jan  1 00:00 dmesg-ramoops-1
>
> If I do not delete the entries and force a new crash, only 2 new
> entries are available
> after the system is online again and the older entries are overwritten.
>
> The reason for this is that the write index is always initialized to 0
> during init.
> Is this intentional? I would expect that existing entries are kept
> until they are explicitly
> deleted or the storage is full. In the latter case the oldest entries
> can be replaced.
>
> Best regards,
> Ronny


Any feedback is appreciated.
Thanks