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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
47 lines
607 B
Plaintext
47 lines
607 B
Plaintext
/badsend
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/btree_test
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/chg_usr_exec
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/devname2devid
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/dir_rd_update
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/draid
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/file_check
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/file_trunc
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/file_write
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/get_diff
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/getversion
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/largest_file
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/libzfs_input_check
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/mkbusy
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/mkfile
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/mkfiles
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/mktree
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/mmap_exec
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/mmap_libaio
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/mmap_seek
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/mmap_sync
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/mmapwrite
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/nvlist_to_lua
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/randfree_file
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/randwritecomp
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/read_dos_attributes
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/readmmap
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/rename_dir
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/rm_lnkcnt_zero_file
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/send_doall
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/stride_dd
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/threadsappend
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/user_ns_exec
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/write_dos_attributes
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/xattrtest
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/zed_fd_spill-zedlet
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/suid_write_to_file
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/cp_files
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/ctime
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/truncate_test
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/ereports
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/zfs_diff-socket
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/dosmode_readonly_write
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/edonr_test
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/skein_test
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/sha2_test
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