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Hi all. I've did some testing this afternoon with bdev freezing disabled and without any non-vanilla code to freeze kthreads (Rafael's or my older version). If I put a BUG_ON() in submit_bio for non suspend2 I/O, it catches this trace: submit_bio xfs_buf_iorequest xlog_bdstrat_cb xlog_state_release_iclog xlog_state_sync_all xfs_log_force xfs_syncsub xfs_sync vfs_sync vfs_sync_worker xfssyncd keventd_create_kthread I haven't yet reproduced anything on another code path (eg pdflush). So, it would appear that freezing kthreads without freezing bdevs should be a possible solution. It may however leave some I/O unsynced pre-resume and therefore result in possible dataloss if no resume occurs. I therefore wonder whether it's better to stick with bdev freezing or create some variant wherein XFS is taught to fully flush pending writes and not create new I/O. Regards, Nigel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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