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9e5a297de6
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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| .. | ||
| badsend | ||
| btree_test | ||
| chg_usr_exec | ||
| devname2devid | ||
| dir_rd_update | ||
| draid | ||
| file_check | ||
| file_trunc | ||
| file_write | ||
| get_diff | ||
| largest_file | ||
| libzfs_input_check | ||
| mkbusy | ||
| mkfile | ||
| mkfiles | ||
| mktree | ||
| mmap_exec | ||
| mmap_libaio | ||
| mmap_seek | ||
| mmap_sync | ||
| mmapwrite | ||
| nvlist_to_lua | ||
| randfree_file | ||
| randwritecomp | ||
| readmmap | ||
| rename_dir | ||
| rm_lnkcnt_zero_file | ||
| send_doall | ||
| stride_dd | ||
| threadsappend | ||
| user_ns_exec | ||
| xattrtest | ||
| file_common.h | ||
| Makefile.am | ||