ext4-rsv-conver ??
In kernel source ..../fs/ext4/super.c we see
/* * The maximum number of concurrent works can be high and * concurrency isn't really necessary. Limit it to 1. */ EXT4_SB(sb)->rsv_conversion_wq = alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); if (!EXT4_SB(sb)->rsv_conversion_wq) { printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); ret = -ENOMEM; goto failed_mount4; }
However, there is no other reference to this symbol in the rest of the kernel source.
Reason I am asking is that it is often shown using much cpu bandwidth, and much io percentage (/bin/iotop -d 3).