Smarter check for free memory in the Upgrader's wrapper
Quoting anonym (#8263-note_1):
In our Live system context, where a lot of stuff is in tmpfs:es,
looking at the values of free or /proc/meminfo alone isn’t accurate
for determining how much memory “really” is free, since the tmpfs
usage is included in the buffers. Hence, MemFree is the lower (and
safe) bound of how much “really” free memory we have, and MemFree + Buffers + Cache is the upper (and unsafe) bound. The true value should
be (at least closer to) MemFree + Buffers + Cache - (sum of usage by tmpfs:es). We should check once against that value instead.
Related issues
- Related to #8263 (closed)
Original created by @intrigeri on 10540 (Redmine)
Edited by intrigeri