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xfs: make xfs_inode_set_eofblocks_tag cheaper for the common case 

For long growing file writes we will usually already have the
eofblocks tag set when adding more speculative preallocations.  Add
a flag in the inode to allow us to skip the the fairly expensive
AG-wide spinlocks and multiple radix tree operations in that case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-09-19 11:09:48 +10:00 committed by Dave Chinner
parent f8e3a82575
commit 85a6e764ff
2 changed files with 15 additions and 0 deletions
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14
fs/xfs/xfs_icache.c
View File

@ -1414,6 +1414,16 @@ xfs_inode_set_eofblocks_tag(
struct xfs_perag *pag;
int tagged;
/*
* Don't bother locking the AG and looking up in the radix trees
* if we already know that we have the tag set.
*/
if (ip->i_flags & XFS_IEOFBLOCKS)
return;
spin_lock(&ip->i_flags_lock);
ip->i_flags |= XFS_IEOFBLOCKS;
spin_unlock(&ip->i_flags_lock);
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
trace_xfs_inode_set_eofblocks_tag(ip);
@ -1449,6 +1459,10 @@ xfs_inode_clear_eofblocks_tag(
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;
spin_lock(&ip->i_flags_lock);
ip->i_flags &= ~XFS_IEOFBLOCKS;
spin_unlock(&ip->i_flags_lock);
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
trace_xfs_inode_clear_eofblocks_tag(ip);

1
fs/xfs/xfs_inode.h
View File

@ -216,6 +216,7 @@ xfs_get_initial_prid(struct xfs_inode *dp)
#define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */
#define XFS_IPINNED (1 << __XFS_IPINNED_BIT)
#define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */
#define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */
/*
* Per-lifetime flags need to be reset when re-using a reclaimable inode during