wt., 5 mar 2024 o 16:33 Christian Loehle <christian.loehle@xxxxxxx> napisał(a): > Immune to what exactly? > - (User) data loss of data that is still in the cache of the sd card? > (That would be saved by a timely cache flush) > - (User) data loss of data that should've been written to flash already? > - SD cards breaking? > - Explosions? Data loss of data that is still in the cache of the sd card > (Anything but the first IMO should be fixed by procurement and not by the > kernel, but I'm not sure if that's consensus). > > > Assuming that I have the information about upcoming power loss > > (provided by e.g. external interrupt, PSU voltage monitoring etc) how > > should I pass this information to the Kernel so that it will try to > > clean up resources - in particular MMC subsystem? > There was a discussion, currently there aren't really, but it depends > on the scenario you're afraid of. Just issuing a cache flush might be fine. > https://www.phoronix.com/news/Linux-Priority-Based-Shutdown > https://lore.kernel.org/lkml/2023112403-laxative-lustiness-6a7f@gregkh/T/ Thanks, I didn't know about this, I will check it. > One of the fundamental questions IMO remains: How much time do we actually > have between being notified? I haven't done any measurements yet, sorry. Best regards Patryk
