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411f4a018d
Page writebacks with WB_SYNC_NONE can take several seconds to complete since they wait for the transaction group to close before being committed. This is usually not a problem since the caller does not need to wait. However, if we're simultaneously doing a writeback with WB_SYNC_ALL (e.g via msync), the latter can block for several seconds (up to zfs_txg_timeout) due to the active WB_SYNC_NONE writeback since it needs to wait for the transaction to complete and the PG_writeback bit to be cleared. This commit deals with 2 cases: - No page writeback is active. A WB_SYNC_ALL page writeback starts and even completes. But when it's about to check if the PG_writeback bit has been cleared, another writeback with WB_SYNC_NONE starts. The sync page writeback ends up waiting for the non-sync page writeback to complete. - A page writeback with WB_SYNC_NONE is already active when a WB_SYNC_ALL writeback starts. The WB_SYNC_ALL writeback ends up waiting for the WB_SYNC_NONE writeback. The fix works by carefully keeping track of active sync/non-sync writebacks and committing when beneficial. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Shaan Nobee <sniper111@gmail.com> Closes #12662 Closes #12790 |
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| .. | ||
| abd_os.c | ||
| arc_os.c | ||
| mmp_os.c | ||
| policy.c | ||
| qat_compress.c | ||
| qat_crypt.c | ||
| qat.c | ||
| spa_misc_os.c | ||
| trace.c | ||
| vdev_disk.c | ||
| vdev_file.c | ||
| zfs_acl.c | ||
| zfs_ctldir.c | ||
| zfs_debug.c | ||
| zfs_dir.c | ||
| zfs_file_os.c | ||
| zfs_ioctl_os.c | ||
| zfs_racct.c | ||
| zfs_sysfs.c | ||
| zfs_uio.c | ||
| zfs_vfsops.c | ||
| zfs_vnops_os.c | ||
| zfs_znode.c | ||
| zio_crypt.c | ||
| zpl_ctldir.c | ||
| zpl_export.c | ||
| zpl_file.c | ||
| zpl_inode.c | ||
| zpl_super.c | ||
| zpl_xattr.c | ||
| zvol_os.c | ||