On 2021/8/26 3:51 PM, Wang Jianchao wrote: >> >>> @@ -3672,8 +3724,14 @@ int __init ext4_init_mballoc(void) >>> if (ext4_free_data_cachep == NULL) >>> goto out_ac_free; >>> >>> + ext4_discard_wq = alloc_workqueue("ext4discard", WQ_UNBOUND, 0); >>> + if (!ext4_discard_wq) >>> + goto out_free_data; >>> + >> >> >> Perhaps we should only allocate the workqueue when it's needed --- >> e.g., when a file system is mounted or remounted with "-o discard"? >> >> Then in ext4_exit_malloc(), we only free it if ext4_discard_wq is >> non-NULL. >> >> This would save a bit of memory on systems that wouldn't need the ext4 >> discard work queue. > > Yes, it make sense to the system with pool memory s/pool/poor :) > > Thanks so much > Jianchao > >> >> - Ted >>