Commit 5132ba8f authored by Dave Chinner's avatar Dave Chinner Committed by Ben Myers
Browse files

xfs: don't cache inodes read through bulkstat 



When we read inodes via bulkstat, we generally only read them once
and then throw them away - they never get used again. If we retain
them in cache, then it simply causes the working set of inodes and
other cached items to be reclaimed just so the inode cache can grow.

Avoid this problem by marking inodes read by bulkstat not to be
cached and check this flag in .drop_inode to determine whether the
inode should be added to the VFS LRU or not. If the inode lookup
hits an already cached inode, then don't set the flag. If the inode
lookup hits an inode marked with no cache flag, remove the flag and
allow it to be cached once the current reference goes away.

Inodes marked as not cached will get cleaned up by the background
inode reclaim or via memory pressure, so they will still generate
some short term cache pressure. They will, however, be reclaimed
much sooner and in preference to cache hot inodes.

Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
parent f6161375

fs/xfs/xfs_iget.c

+6 −2
Original line number Diff line number Diff line
@@ -289,7 +289,7 @@ xfs_iget_cache_hit( 
	if (lock_flags != 0)

		xfs_ilock(ip, lock_flags);



	xfs_iflags_clear(ip, XFS_ISTALE);

	xfs_iflags_clear(ip, XFS_ISTALE | XFS_IDONTCACHE);

	XFS_STATS_INC(xs_ig_found);



	return 0;
@@ -314,6 +314,7 @@ xfs_iget_cache_miss( 
	struct xfs_inode	*ip;

	int			error;

	xfs_agino_t		agino = XFS_INO_TO_AGINO(mp, ino);

	int			iflags;



	ip = xfs_inode_alloc(mp, ino);

	if (!ip)
@@ -358,8 +359,11 @@ xfs_iget_cache_miss( 
	 * memory barrier that ensures this detection works correctly at lookup

	 * time.

	 */

	iflags = XFS_INEW;

	if (flags & XFS_IGET_DONTCACHE)

		iflags |= XFS_IDONTCACHE;

	ip->i_udquot = ip->i_gdquot = NULL;

	xfs_iflags_set(ip, XFS_INEW);

	xfs_iflags_set(ip, iflags);



	/* insert the new inode */

	spin_lock(&pag->pag_ici_lock);

fs/xfs/xfs_inode.h

+3 −1
Original line number Diff line number Diff line
@@ -387,10 +387,11 @@ xfs_set_projid(struct xfs_inode *ip, 
#define XFS_IFLOCK		(1 << __XFS_IFLOCK_BIT)

#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 */



/*

 * Per-lifetime flags need to be reset when re-using a reclaimable inode during

 * inode lookup. Thi prevents unintended behaviour on the new inode from

 * inode lookup. This prevents unintended behaviour on the new inode from

 * ocurring.

 */

#define XFS_IRECLAIM_RESET_FLAGS	\
@@ -553,6 +554,7 @@ do { \ 
 */

#define XFS_IGET_CREATE		0x1

#define XFS_IGET_UNTRUSTED	0x2

#define XFS_IGET_DONTCACHE	0x4



int		xfs_inotobp(struct xfs_mount *, struct xfs_trans *,

			    xfs_ino_t, struct xfs_dinode **,

fs/xfs/xfs_itable.c

+2 −1
Original line number Diff line number Diff line
@@ -75,7 +75,8 @@ xfs_bulkstat_one_int( 
		return XFS_ERROR(ENOMEM);



	error = xfs_iget(mp, NULL, ino,

			 XFS_IGET_UNTRUSTED, XFS_ILOCK_SHARED, &ip);

			 (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),

			 XFS_ILOCK_SHARED, &ip);

	if (error) {

		*stat = BULKSTAT_RV_NOTHING;

		goto out_free;

fs/xfs/xfs_super.c

+17 −0
Original line number Diff line number Diff line
@@ -950,6 +950,22 @@ xfs_fs_evict_inode( 
	xfs_inactive(ip);

}



/*

 * We do an unlocked check for XFS_IDONTCACHE here because we are already

 * serialised against cache hits here via the inode->i_lock and igrab() in

 * xfs_iget_cache_hit(). Hence a lookup that might clear this flag will not be

 * racing with us, and it avoids needing to grab a spinlock here for every inode

 * we drop the final reference on.

 */

STATIC int

xfs_fs_drop_inode(

	struct inode		*inode)

{

	struct xfs_inode	*ip = XFS_I(inode);



	return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);

}



STATIC void

xfs_free_fsname(

	struct xfs_mount	*mp)
@@ -1434,6 +1450,7 @@ static const struct super_operations xfs_super_operations = { 
	.destroy_inode		= xfs_fs_destroy_inode,

	.dirty_inode		= xfs_fs_dirty_inode,

	.evict_inode		= xfs_fs_evict_inode,

	.drop_inode		= xfs_fs_drop_inode,

	.put_super		= xfs_fs_put_super,

	.sync_fs		= xfs_fs_sync_fs,

	.freeze_fs		= xfs_fs_freeze,

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