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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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| .. | ||
| Makefile.am | ||
| policy.h | ||
| sha2.h | ||
| trace_acl.h | ||
| trace_arc.h | ||
| trace_common.h | ||
| trace_dbgmsg.h | ||
| trace_dbuf.h | ||
| trace_dmu.h | ||
| trace_dnode.h | ||
| trace_multilist.h | ||
| trace_rrwlock.h | ||
| trace_txg.h | ||
| trace_vdev.h | ||
| trace_zfs.h | ||
| trace_zil.h | ||
| trace_zio.h | ||
| trace_zrlock.h | ||
| zfs_bootenv_os.h | ||
| zfs_context_os.h | ||
| zfs_ctldir.h | ||
| zfs_dir.h | ||
| zfs_vfsops_os.h | ||
| zfs_vnops_os.h | ||
| zfs_znode_impl.h | ||
| zpl.h | ||