Samuel Sieb:
>> The journal has nothing to do with memory management.  It's about 
>> filesystem protection.  btrfs would also be better because it is 
>> always "journaled" (not exactly, but fairly equivalent).

Bill Cunningham:
> I thought it was involved in "swapping". Like a swap file my bad.

File system journalling is about all writing to a drive being done as a
sequence (this write, then that update, then the next update).  During
a crash, hopefully you only lost the last bit of writing, and what was done 
before that is still there.
 
-- 
 
uname -rsvp
Linux 3.10.0-1160.66.1.el7.x86_64 #1 SMP Wed May 18 16:02:34 UTC 2022 x86_64
 
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