Re: using dev_coredumpv

[Arend van Spriel <arend@broadcom.com>]

On 09/07/2015 11:54 AM, Johannes Berg wrote:
> On Mon, 2015-09-07 at 11:47 +0200, Arend van Spriel wrote:
>> Hi Johannes,
>>
>> I am looking at devcoredump subsystem and I was wondering about the
>> lifetime of the devcd folder. With dev_coredumpm() the description says:
>> "If a previous one hasn't been read yet, the new coredump is
>> discarded.". I am wondering what "read" means here. For testing I call
>> dev_coredumpv() every second, but when I hexdump the data file it does
>> not create a new devcd folder. That only occurs after 5 minutes. Is that
>> expected?
>
> I suppose "read" should say "discarded by userspace", but I always
> assumed userspace would read the file and then discard the coredump by
> writing (anything iirc) to the file.

Thanks. Went back to devcoredump.c and reading the code found that 
devcd_data_write schedules devcd_del work without any condition. Sorry 
for being lazy.

Gr. AvS

> IOW - yes, this is expected, you should write to the data file which
> makes it (and the folder) disappear and allows creating a new one.
>
> johannes
>