On 2018/11/22 下午10:03, Roman Mamedov wrote: > On Thu, 22 Nov 2018 22:07:25 +0900 > Tomasz Chmielewski <tch@xxxxxxxxxxx> wrote: > >> Spot on! >> >> Removed "discard" from fstab and added "ssd", rebooted - no more >> btrfs-cleaner running. > > Recently there has been a bugfix for TRIM in Btrfs: > > btrfs: Ensure btrfs_trim_fs can trim the whole fs > https://patchwork.kernel.org/patch/10579539/ > > Perhaps your upgraded kernel is the first one to contain it, and for the first > time you're seeing TRIM to actually *work*, with the actual performance impact > of it on a large fragmented FS, instead of a few contiguous unallocated areas. > That only affects btrfs_trim_fs(), and you can see it's only called from ioctl interface, so it's definitely not the case. Thanks, Qu
