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50718b8d73
All background reclaim is SYNC_TRYLOCK already, and even blocking reclaim (SYNC_WAIT) can use trylock mechanisms as xfs_reclaim_inodes_ag() will keep cycling until there are no more reclaimable inodes. Hence we can kill SYNC_TRYLOCK from inode reclaim and make everything unconditionally non-blocking. We remove all the optimistic "avoid blocking on locks" checks done in xfs_reclaim_inode_grab() as nothing blocks on locks anymore. Further, checking XFS_IFLOCK optimistically can result in detecting inodes in the process of being cleaned (i.e. between being removed from the AIL and having the flush lock dropped), so for xfs_reclaim_inodes() to reliably reclaim all inodes we need to drop these checks anyway. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.