Am Do., 21. Nov. 2019 um 23:22 Uhr schrieb Zygo Blaxell <ce3g8jdj@xxxxxxxxxxxxxxxxxxxxx>: > Snapshot delete is pretty aggressive with IO [...] can effectively hang for a few minutes > while btrfs-cleaner runs. It's doesn't look like it's btrfs-cleaner that blocks here, though, more like it's btrfs-transacti. > Snapshot create has unbounded running time on 5.0 kernels. It looks to me like delete, not create, is the culprit here. > Anything that needs to take a sb_writer lock (which is almost everything > that modifies the filesystem) will hang until the snapshot create is done; It's not just fs activity, either. Even if I'm just typing in LibreOffice or at a bash prompt, the input isn't registered during the freeze (it's buffered, so it comes out all at once in the end). Cheers, C.
