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a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: 3FZL_SGb7jwee9EduDyByF24a5Excan7 X-Proofpoint-ORIG-GUID: 3FZL_SGb7jwee9EduDyByF24a5Excan7 On 15/09/2026 16:41, John Garry wrote: > On 9/15/26 15:50, Darrick J. Wong wrote: >>> thanks >>> >>> About the kernel code, I am wondering if using IOMAP_DIO_FORCE_WAIT for >>> CoW-based atomics could help avoid this issue as we seem to be bogged >>> down >>> in lock contention. >> Which lock is being contended, anyway?  It looks like the ILOCK? > > Yeah, I think so Re. ilock. I had some perf data illustrating this from > last year, which I can't seem to find, so I will re-generate it. Here is perf call graph snippet when running fio with 72x threads issuing 4KB atomic writes on 1MB file: --50.46%--xfs_file_dio_write_atomic | |--37.19%--iomap_dio_rw | | | --37.14%--__iomap_dio_rw | | | --36.50%--iomap_iter | | | --36.49%--xfs_atomic_write_cow_iomap_next | | | |--27.34%--xfs_ilock | | | | | --27.34%--down_write | | | | | --27.28%--rwsem_down_write_slowpath | | | | | |--24.65%--osq_lock | | | | | --2.35%--rwsem_spin_on_owner | | | |--7.62%--xfs_trans_alloc_inode | | | | | --7.59%--xfs_ilock Notice how much time we spend getting that ilock. We could try something like this: ----8<------ [PATCH] xfs: serialize CoW-based atomic writes We have had reports of system hangs when testing Cow-based atomic writes for large block sizes. Analysis has shown large contention on the the per-inode ilock, superficially in creating the mapping in xfs_atomic_write_cow_iomap_begin(). Serialize atomic writes to reduce this contention. In some cases this may reduce performance, but high performance has not been a requirement so far for CoW-based atomic writes. Signed-off-by: John Garry diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index d8202da15aca..ff48757cf0f0 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -819,10 +819,12 @@ xfs_file_dio_write_atomic( * HW offload should be faster, so try that first if it is already * known that the write length is not too large. */ - if (ocount > xfs_inode_buftarg(ip)->bt_awu_max) + if (ocount > xfs_inode_buftarg(ip)->bt_awu_max) { dops = &xfs_atomic_write_cow_iomap_ops; - else + dio_flags |= IOMAP_DIO_FORCE_WAIT; + } else { dops = &xfs_direct_write_iomap_ops; + } retry: ret = xfs_ilock_iocb_for_write(iocb, &iolock); @@ -840,6 +842,8 @@ xfs_file_dio_write_atomic( } trace_xfs_file_direct_write(iocb, from); + if (dio_flags & IOMAP_DIO_FORCE_WAIT) + inode_dio_wait(VFS_I(ip)); if (mapping_stable_writes(iocb->ki_filp->f_mapping)) dio_flags |= IOMAP_DIO_BOUNCE; ret = iomap_dio_rw(iocb, from, dops, &xfs_dio_write_ops, dio_flags, @@ -853,6 +857,7 @@ xfs_file_dio_write_atomic( */ if (ret == -ENOPROTOOPT && dops == &xfs_direct_write_iomap_ops) { xfs_iunlock(ip, iolock); + dio_flags |= IOMAP_DIO_FORCE_WAIT; dops = &xfs_atomic_write_cow_iomap_ops; goto retry; } ---->8------ This is far from ideal, but I think that it should stops the hangs - having the kernel hang is intolerable. I also notice that in xfs_atomic_write_cow_iomap_next() we drop the ilock for calling xfs_trans_alloc_inode() (which immediately grabs the same lock). It would seem that could be improved.